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20 January 2017, Volume 23 Issue 1 Previous Issue    Next Issue

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Progress of Breeding on Indica Hybrid Rice in China 2017, 23(1): 1-4.  DOI: 10.3969/j.issn.1006-8082.2017.01.001 Abstract ( )   PDF (423KB) ( )   Since the rice heterosis utilization was found, the breeding of indica hybrid rice has achieved conspicuous progresses in China. It played an important role in the protection of China's grain security. In this paper, according to the varieties statistical data of China Rice Center Data, the author compared and analyzed the breeding progress of sterile, the registration of indica hybrid varieties, the current development situation of Chinese super rice and the varietal registration of several major provinces of indica hybrid rice breeding. Moreover, the indica hybrid rice breeding was also prospected.

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Rice Sensory Evaluation of Different Characteristics Consumers 2017, 23(1): 5-9.  DOI: 10.3969/j.issn.1006-8082.2017.01.002 Abstract ( )   PDF (695KB) ( )   China is one of the main countries for rice production and consumption, with growing demand for rice quality improvement. The study selected 7 representative cities, including Tianjin, Harbin, Xi’an, Changsha, Hangzhou, Guangzhou and Chengdu, and 163 consumers as panelists to complete sensory evaluation of 4 kinds of rice（2 japonica rice and 2 indica rice）. The results showed that  consumers from different regions, with different ages and genders are different in preference degree. Especially in traditional indica rice market areas, consumers’ evaluation of japonica rice was obviously higher than that of indica rice, indicating an obvious trend that indica rice market is shrinking and japonica rice market is transferring to the south.

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Yield Formation and Morphological and Physiological Characteristics of Medium-maturity Type of Yongyou Japonica/Indica Hybrid Rice 2017, 23(1): 10-16.  DOI: 10.3969/j.issn.1006-8082.2017.01.003 Abstract ( )   PDF (738KB) ( )   A field experiment was conducted to study the differences of dry matter accumulation, panicle traits, leaf morphology traits and culm traits in different types of rice varieties, using medium-maturity type of Yongyou japonica/indica hybrid rice（Yongyou 2640, Yongyou 11640） as the material, conventional japonica rice （Zhengdao 11, Wuyungeng 30） and hybrid indica rice （Fengliangyouxiang 1, Xinliangyou 6380） as the control. The results were as follows: the grain yield of Yongyou japonica/indica hybrid rice was 11.3 t/hm2, which was 6.6% and 13.0% higher than that of conventional japonica rice and hybrid indica rice, respectively. As for yield components, Yongyou japonica/indica hybrid rice had highest spikelets per panicle and total spikelets among the different type of rice varieties , but its 1 000-grain weight, seed setting rate and effective panicles were lower than CK. The dry matter of Yongyou japonica/indica hybrid rice was 13.4 t/hm2 at heading stage and 21.6 t/hm2 at maturity stage（6.9 t/hm2 from heading to maturity）, significantly higher than CK. In terms of panicle traits, Yongyou japonica/indica hybrids rice had the highest grain weight per panicle and grain density, but its panicle length was less than hybrid indica rice. The 80% grains of Yongyou japonica/indica hybrid rice were concentrated on the middle and upper part of the panicle, while the 75% grains of conventional japonica rice were concentrated on the middle and lower part of the panicle, and the grains of hybrid indica rice distributed relatively uniform. The leaf width and rolling rate of the top-three leaves of Yongyou japonica/indica hybrid rice were higher than CK. The top-three leaves of hybrid indica rice had medium leaf length and basic leaf angle. Drooping angle of the top-three leaves of Yongyou japonica/indica hybrid rice were lower than CK, and the differences of the top 1 leaf and top 3 leaf were significant. The plant height, panicle height, stalk length and the proportion of neck internode to stalk length showed hybrid indica rice> Yongyou japonica/indica hybrid rice>conventional japonica rice. Among the different type of rice varieties, Yongyou japonica/indica hybrid rice had the highest dry weight of stem, sheath and per unit internode at maturity stage. The yield advantage of medium-maturity type of Yongyou japonica/indica hybrid rice were characterized by enough spikes and large spike, higher seed setting rate and 1 000 grain weight. The morphological and physiological characteristic of medium-maturity type of Yongyou japonica/indica hybrid rice were showed that  grains concentrated on middle and upper part of panicle, appropriate size of top-three leaves, curled and upright leaves, moderate plant height, suitable ratio of neck internode to stalk length, and good fullness degree of stem at maturity stage.

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Response of Hybrid Mid-season Rice to Flooding and Discussion of Indicative Index at the Jointing Stage 2017, 23(1): 17-25.  DOI: 10.3969/j.issn.1006-8082.2017.01.004 Abstract ( )   PDF (1552KB) ( )   In the middle and lower reaches of the Yangtze River, there is more rainfall in summer, especially in jointing stage of hybrid mid-season rice, so that rice is liable to suffer from waterlogging damage. In order to quantitively reveal the influence of flooding on hybrid mid-season rice growth, scientifically assess the yield loss caused by it, and to provide data base of the morphological, physiological characteristics and yield structure, those indexes presented higher correlation degree with relative yield could be used as key morphological and physiological indexes to indicate the yield reduction level at the jointing stage of hybrid mid-season rice after flooding, a cross test of flooding depth（a quarter, a half, three-quarters and full submerged） and waterlogging duration（3, 6 and 9 days） was done in the jointing stages of hybrid mid-season rice. The results showed that after submergence treatment, the rice height and the internode length all present elongation（the 1rd and 2th internode elongate mainly in the booting stage, the 2rd internode elongating faster）, the yellow leaves number and the longest leaf length of plant increased significantly, which is significant linear positive correlation with the increase of flooding depth and waterlogging duration, A significant correlation of two variables with the first power exists among YPH （plant height growth）, YIL（internode length）, YYL（yellow leaves number）, YLL（longest leaf length）and D（submergence days）, H（submergence depth）; as far as physiological characteristics, under the identical flooding duration, chlorophyll（Chla and Chlb） and soluble protein content of sword leaf was decreased with the increase of waterlogging duration, which has significant negative correlation with flooding depth, but the content of soluble saccharide was increased first and then decreased with the increase of flooding depth, while the MDA content in the sword leaf was significantly positively related with the increase of flooding depth, and in the root was increased first and then decreased when the flooding duration was 9 days, which the turning point was a half submergence depth. At the same time, the activity of SOD in the sword leaf and root was increased first and then decreased with the increase of flooding depth, the activity of POD in sword leaf presents the rising trend with the increase of flooding depth, moreover the severe the waterlogged depth was, the higher the amplification of POD activity could be, and that in root was increased first and then decreased with the increase of flooding depth, which the turning point was a half of submergence for 6 days, under the identical flooding duration. In light of the yield component, the seed setting rate reduced by more than 20% and yield decreased by 19% than that of the control when the rice run into quarter of submergence for 6 days at the jointing stage. Through gray correlation and cluster analysis in this research, it was concluded that Chlb, soluble protein and Chla content could be used as key physiological indexes in evaluating waterlogged and reduction of yield degree after flooding.

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Analysis of SPAD Value of Rice Leaf and Yield Under Different Soil Fertility and Nitrogen Application 2017, 23(1): 26-30,35.  DOI: 10.3969/j.issn.1006-8082.2017.01.005 Abstract ( )   PDF (691KB) ( )   SPAD value of rice canopy leaves and yield under different soil fertility and nitrogen application were analyzed, Qyou 6 as material. The results showed that the curve relationship between yield and apparent nitrogen supply was very significant, and there was a higher yield for Qyou 6 when apparent nitrogen supply was 575.27 kg/hm2. The SPAD value of every growth stage under different soil fertility and nitrogen application was heading stage＞jointing stage＞maturity stage, and the difference of SPAD value were mainly at heading stage and maturity stage. The differences of SPAD value of four rice canopy leaves of different soil fertility and nitrogen application were mainly in third leaf and fourth leaf. Their SPAD values could be used as parameter to diagnose the nutritional status of nitrogen. The linear relationship between SPAD value and apparent nitrogen supply was significant, and the matching effect of adopting SPAD L3×L4/mean was best. The secondary index of SPAD value obtained from rice canopy leaves could estimate available nitrogen of soil.

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Effects on Rice Quality of Different Cultivation Modes 2017, 23(1): 31-35.  DOI: 10.3969/j.issn.1006-8082.2017.01.006 Abstract ( )   PDF (576KB) ( )   A field experiment was carried out to explore the effects of different cultivation modes on rice quality. The results showed that the brown rice rate and milled rice rate were highest under dry film mulching cultivation, the head rice rate was highest under water film mulching cultivation. There was no significant difference in grain length and length/width ratio of the same variety in different cultivation modes, but the film mulching cultivation had a higher rate of chalky rice rate and chalkiness degree. Compared with CK, 88S/1128 under dry film mulching cultivation has lower amylase content and gel consistency, but higher pasting temperature; Xiangwanxian17 under dry film mulching cultivation has lower amylose content, higher gel consistency and lower pasting temperature. The protein content of two varieties showed dry and no film mulching cultivation > conventional cultivation > dry film mulching cultivation > water film mulching cultivation. The variation degree of rice quality traits showed appearance quality traits > cooking and eating quality traits > milling quality traits.

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Effects of Water Stress on Growth and Physiological Features and Yield of Rice 2017, 23(1): 36-42.  DOI: 10.3969/j.issn.1006-8082.2017.01.007 Abstract ( )   PDF (862KB) ( )   Using rice variety Xinliangyou 6 as materials, the effects of water stress on growth, physiological characteristics and yield of rice were studied. The results indicated that the plant height were decreased, the crop-stem lodging resistance was effectively increased, the content of Methane Dicarboxylic Aldehyde and proline and total soluble sugar were markedly increased. Compared with CK, the yield of the short time water stress treatment （T1） was increased by 9.2%.

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Effects of Water Stress on Rice Growth and Grain Quality During Flowering 2017, 23(1): 43-45.  DOI: 10.3969/j.issn.1006-8082.2017.01.008 Abstract ( )   PDF (359KB) ( )   The effects of water stress on growth and grain quality of rice varieties were studied in this paper, using zhunliangyou 527 and Ⅱyou 162 as materials. The results showed that under water stress condition, the 1000-grain weight and seed setting rate were decreased significantly, which lead to the reduction of yield, and the plant height, leaf area and SPAD value were also decreased. After water stress, the chalkiness degree, chalky rice rate and protein content were increased, the amylose content was decreased, and the head rice rate was significantly decreased. Therefore, it is extremely important to maintain suitable water managementin the flowering stage of rice.

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Application Effects and Suitable Fertilizing Method of New Rice Special-purpose Prescription Fertilize on Rice 2017, 23(1): 46-50.  DOI: 10.3969/j.issn.1006-8082.2017.01.009 Abstract ( )   PDF (603KB) ( )   In order to find out a new fertilize that can promote plant growth and improve the yield of rice, the authors designed three kinds of new rice special-purpose prescription fertilizes named A, B and C, based on the nutritional requirements of rice. A field experiment was carried out by three fertilizer levels for 30 kg/667 m2 and 40 kg/667 m2 and 50 kg/667 m2. The results showed that, fertilizer A could promote the seed setting rate of rice and increase filled grains per panicle; fertilizer B had advantages in plant height, stem diameter and effective tillering; fertilizer C had no obvious advantage. 30 kg/667 m2 was obviously insufficient for rice growth and 50 kg/667 m2 could get higher yield. Comprehensively, fertilizer B was the best and the proper fertilizer amount was 50 kg/667 m2.

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Comparative Analysis of RVA Characteristic Values of Japonica Maintainers of Dian-type Hybrid Rice to a High Quality Soft Rice 2017, 23(1): 51-53,56.  DOI: 10.3969/j.issn.1006-8082.2017.01.010 Abstract ( )   PDF (492KB) ( )   In order to strengthen breeding of high quality hybrid japonica rice of Dian-type, rice grains of 159 maintainers of japonica Dian-type hybrid rice were analyzed with Rapid Visco Analyser （RVA）, and the RVA characteristic values were analyzed with principal component, and the 159 samples were clustered, then the samples clusters were compared with Yunhui 290 through Bayes discrimination. The results indicated that 8 RVA characteristic values were composed of 3 principal components, soft and hard, gel, retrogradation, which occupied 89.64% contribution of the 8 RVA characteristic values. All the 159 samples were clustered into 2 groups. GroupⅠcovered 92.45% maintainers, which could be divided into 3 subgroups. Average values of RVA characteristic data of subgroup I-1 and I-3, which covered 136 （85.53%） samples were high similar with those of Yunhui 290 on Bayes discriminant functions.

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Evaluation of Uncertainty in Determination of Chlorpyrifos Residue in Rice by Gas Chromatography 2017, 23(1): 54-56.  DOI: 10.3969/j.issn.1006-8082.2017.01.011 Abstract ( )   PDF (366KB) ( )   The uncertainty of determination of chlorpyrifos residue in rice by gas chromatography was evaluated in this paper. By analyzing the various variable parameters among the procedures, the components of uncertainty were identified, the mathematical model was established, and every components of uncertainty was calculated, thereby, the combined uncertainty was finally obtained． The expanded uncertainty was 0.013 mg/kg（k=2） with 0.107 mg/kg of the content of chlorpyrifos residue in rice.

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Innovation and Transformation of Rice Production Technology in South Korea 2017, 23(1): 57-59.  DOI: 10.3969/j.issn.1006-8082.2017.01.012 Abstract ( )   PDF (462KB) ( )   The planting ways of rice in South Korean happened transformation in recent decades, with the development of social economy and the transfer of agricultural labor force. Since the late of 1970s, the area by hand-transplanting rice decreased and the area by machine-transplanted rice increased. Up to 1990s, machine-transplanted rice was popularized. Because of the yield of cultivation by direct seeding are greatly influenced by uncertain factors, and quality worse than machine- transplanted rice and hand-transplanted rice, its planting area happened wave, and occupied about 4.0% of the rice area of South Korea. This paper introduced the operation procedure of machine-transplanting, wet direct seeding and dry direct seeding by machine.

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Comparative Analysis on Cost and Benefit of Rice Production in Guangdong 2017, 23(1): 60-64.  DOI: 10.3969/j.issn.1006-8082.2017.01.013 Abstract ( )   PDF (571KB) ( )   The rice cost-benefit of comparison between inter annual, varieties and inter regional，and the cost-benefit between rice and economic crops were analyzed, the rice cost-benefit data from 2004 to 2014 as the basis. The results showed that the costs of rice production in Guangdong increased at an average annual rate of 10% in the past ten years；the price of rice rises is far lower than the cost of production rise, lead to the falling of rice planting benefit, even  loss, especially the net profit and cost profit rate is lower than the national average level, and significantly lower than the vegetables, fruits, peanuts and other crops. The author thinks that, the main reason of the low benefit of rice production in Guangdong is due to a low degree of scale operation and high cost, to improve scale operation and mechanized operations level is the basic way of improving the efficiency of rice cultivation.

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Bacterial Blight Resistance Analysis of China National and Hunan Province Authorized Rice Varieties in Recent 30 Years 2017, 23(1): 65-68.  DOI: 10.3969/j.issn.1006-8082.2017.01.014 Abstract ( )   PDF (483KB) ( )   In order to provide a reference for rice bacterial blight resistance breeding, reduce the bacterial blight damage in rice production, the resistance of rice regional test varieties in recent 30 years were summarized, those authorized resistant varieties were analyzed in this article.

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Analysis of Rice Varieties Evolution and Prospect in Northeast of Chongqing 2017, 23(1): 69-72.  DOI: 10.3969/j.issn.1006-8082.2017.01.015 Abstract ( )   PDF (475KB) ( )   Rice varieties in Northeast of Chongqing experienced three important promotion period of high stalk varieties, dwarf varieties and hybrid rice combinations. The promotion period of hybrid rice had the longest period and the greatest effect in rice production in this region, it experienced four important development stages, too. Now, the region showed a significant increase of the number of rice varieties and the decline of the area of single varieties. We should breed and promote the rice varieties with excellent comprehensive traits in disease resistance, high yield, fine quality.

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Effects of Different Cropping Systems and Variety Type on Grain Yield of Direct Seeding Rice in Chengdu Plain 2017, 23(1): 73-77.  DOI: 10.3969/j.issn.1006-8082.2017.01.016 Abstract ( )   PDF (539KB) ( )   The present study was conducted to investigate the effects of crop rotation systems and variety type on yield formation under direct seeding rice. The result will provide a theoretical basis for scientific adoption of suitable variety types under direct seeding for different crop rotation systems in Deyang City, Sichuan Province. A field experiment with early rice （ER）, early-maturing mid-season hybrid rice （EM）, medium-maturing mid-season hybrid rice （MM）and late-maturing mid-season hybrid rice （LM） were conducted to clarify the characteristics of yield formation and biomass production of variety types under direct seeding condition and cropping rotation systems. The results showed that, with the delay of sowing date, the growth duration from sowing to heading and heading to maturity were shorten, the grain yield of ER, EM and MM increased first and then decreased, and the grain yield of LM decreased significantly. MM produced the highest grain yield with 8.47 t/hm2 and 9.30 t/hm2 in green vegetable-rice cropping system and rape-rice cropping system, respectively; while EM get the highest grain yield in wheat-rice cropping system, which reached 7.99 t/hm2. With the delay of sowing date, the biomass of EM and MM increased first and then decreased, while the biomass of ER and LM decreased significantly. It is suggested that high grain yield could be achieved by adopting medium-maturing mid-season hybrid rice under direct seeding condition in green vegetable-rice and rape-rice cropping system, and early-maturing mid-season hybrid rice was suitable for wheat-rice cropping system under direct seeding condition.

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Effects of Spraying Triterpene Acids from Fir Needles on Yield and Quality of Rice 2017, 23(1): 78-80.  DOI: 10.3969/j.issn.1006-8082.2017.01.017 Abstract ( )   PDF (365KB) ( )   The effects of different dosages of triterpene acids from fir needles on yield and quality of rice were studied, Zhengdao 8 as material. The results showed that the thousand seed weight, brown rice rate, head rice rate, amylose content and protein content of rice were increased, and the milling quality and nutrition quality of rice were also improved after spraying triterpene acids from fir needles, compared with the control. The best application way of 10% triterpene acids EW for rice were as following: seed dressing with 80 mL/t before sowing, foliage spraying with 80 mL/hm2 in the tillering stage and heading stage. Under the condition, the yield of rice could increased by 16.60%.

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Correlation and Path Analysis of Yield and Quality Traits of Rice Combinations from Huaxiang A 2017, 23(1): 81-85.  DOI: 10.3969/j.issn.1006-8082.2017.01.018 Abstract ( )   PDF (522KB) ( )   By analyzing the data collected from 10 hybrid rice from Huaxiang A for rice regional test with the coefficient of the correction and path analysis, the results indicated that there exist significant positive correlation between daily production and effective panicle number, plant height and panicle length, grain number per panicle and filled grain number of per panicle, respectively. And the contribution of daily production to grain yield is the largest, next for effective panicle number. The head rice rate and chalky rice rate, length/width ratio and chalky rice rate, length/width ratio and chalkiness degree are significant negative correlation. Accordingly, we can increase the yield of hybrid rice from Huaxiang A by improving the daily production and the number of effective panicle, extending the growth period, reducing the plant height and panicle length properly. And in order to improve the grain quality, we should reduce the length/width ratio moderately, so as to improve the grain filling efficiency, reduce the chalky rice rate and chalkiness degree, and improve the head rice rate.

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Quantitative Index of Population and Precise and Quantitative Cultivation Technique of Yongyou 1540 with Nutrition Bowl Mechanical Transplanting for 850 kg/667 m2 2017, 23(1): 86-89.  DOI: 10.3969/j.issn.1006-8082.2017.01.019 Abstract ( )   PDF (547KB) ( )   Under super-sparse of nutrition bowl mechanical transplanting, the yield components, tiller dynamic, LAI and dry matter accumulation of population of different yield were studied, using indica-japonica hybrid rice Yongyou 1540 as material. Quantitative index of population and precise and quantitative cultivation techniques for 850 kg/667 m2 of Yongyou 1540 were summed up in this paper.

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Effects of Application of Lvxianji and Lvjuneng Compound Fertilizers on Rice Yield and Economic Benefit 2017, 23(1): 90-91.  DOI: 10.3969/j.issn.1006-8082.2017.01.020 Abstract ( )   PDF (238KB) ( )   In order to study the effects of application of Lvxianji and Lvjuneng compound fertilizers on rice yield and benefit, we made comparison research on dynamics of tillers, panicle traits, yield and yield components of rice. The results showed that, compared with Lvjuneng compound fertilizer, Lvxianji compound fertilizer improved the effective tiller percentage, increased the number of primary and secondary branches, reduced the branch degeneration rate, and finally improved rice yield. In addition, Lvxianji compound fertilizer made more profit because of higher yield and lower cost.

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Effects of Precise Potted-tray Seedlings on Seedlings and Transplanting Quantity of Rice by Mechanical-transplanting Method 2017, 23(1): 92-95.  DOI: 10.3969/j.issn.1006-8082.2017.01.021 Abstract ( )   PDF (497KB) ( )   In order to cultivate seedlings that are adaptable to farming system and transplanter, the seedling quality and machine transplanting quality of potted-tray, bowl-shaped blanket tray and soft plastic flat plate were compared and analyzed in this paper. The results showed that nursing seedlings with potted-tray had the advantages of saving seeds, high sowing precision, high seedling rate. The quality difference was smallest among the 20-day-old seedlings that were nursed with 3 different patterns, but since then the quality advantage of potted-tray grown seedlings had been more and more prominent. There was small difference in quality among the 30-day-old seedlings. However, for the seedlings that were older than 40 d, the transplanting quality of potted-tray grown seedlings was higher than that of bowl-shaped blanket tray grown seedlings and soft plastic flat plate grown seedlings. In addition, the returning  green period of the potted-tray grown seedlings was significantly shortened. Compared to the bowl-shaped blanket tray grown seedlings and soft plastic flat plate grown seedlings, the potted-tray grown seedlings were more suitable to transplant by machine in the wheat-rice double cropping areas of Chengdu Plain.

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Application of Pesticides Combination and Benefit Analysis for Controlling Diseases and Insect Pests of Super Hybrid Rice Yongyou12 2017, 23(1): 96-99.  DOI: 10.3969/j.issn.1006-8082.2017.01.022 Abstract ( )   PDF (470KB) ( )   Three pesticides combinations were applied for controlling the diseases and insect pests of super hybrid rice Yongyou12 in green control area at Xianshi Village of Liangzhu Sub-district, and the cost-effectiveness were evaluated. The results showed that less chemical pesticides and low costs were not in conflict with pest control effectiveness. The application frequency and dosage of treatment 1, were reduced when compared with treatment 3 under the same cultivation and management. The pesticides spraying of treatment 1 was reduced one time, the cost was decreased by 418.5 CNY/hm2, rice grain yield increased 1 264.50 kg/hm2 （amount to increase production 12.25%）, and the income raised 14.30% when compared with treatment 3. The pesticides spraying of treatment 2 reduced once, the yield was increased by 603.00 kg/hm2 （amount to increase production 5.84%）, and the income raised 5.90% when compared with treatment 3. The investigation indicated that the benefit and the cost were quite different among different pesticides combinations. The appropriate pesticides combination and timely spraying period will save the cost and increase the benefits, and contribute to protect ecosystem and improve the quality of rice.

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Breeding and Application of a New Late Hybrid Rice Wufengyou 105 2017, 23(1): 100-101,103.  DOI: 10.3969/j.issn.1006-8082.2017.01.023 Abstract ( )   PDF (417KB) ( )   Wufengyou 105 is a new late indica hybrid rice, developed from fertile restoring line R105 and male sterile line Wufeng A by Jiangxi Guosui Seeds Co. Ltd. It has the characteristics of high and stable yield, fine rice quality, high resistance, wide adaptability and moderate growth period. It was approved by Jiangxi Provincial Crop Variety Appraisal Committee in 2015.

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Planting Performance and High-yielding Cultivation Techniques of Hybrid Rice Combination Luyouhuazhan with Good Quality 2017, 23(1): 102-103.  DOI: 10.3969/j.issn.1006-8082.2017.01.024 Abstract ( )   PDF (275KB) ( )   Luyou huazhan is a new hybrid rice combination, developed from the cross of a CMS line luxiang 078 A and a restorer line huazhan. It has the characteristics of moderate growth period, strong tillering ability, strong lodging resistance, strong adaptability, good quality, high and stable yield. This paper introduced its planting performance and high-yielding cultivation techniques in Saxian in 2014 and 2015.

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Contrast Test of Conventional Japonica Rice Varieties as Single Rice in Tongcheng City 2017, 23(1): 104-106,109.  DOI: 10.3969/j.issn.1006-8082.2017.01.025 Abstract ( )   PDF (476KB) ( )   Planting comparison test of seven conventional japonica rice varieties in Tongcheng City were conducted, using Wuyujing 23 as control variety. The results showed that the seven conventional japonica rice varieties have the characteristics of high-yielding, strong disease resistance, fertilizer tolerance and lodging resistance. The average yield of the seven conventional japonica rice varieties is 11.26 t/hm2, increased by 23.19% compared with the control. These seven conventional japonica rice varieties are suitable for planting in Tongcheng City as single rice.

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Major Restriction Factors of High Yield and Benefit of Machine -transplanted Rice in Gushi County 2017, 23(1): 107-109.  DOI: 10.3969/j.issn.1006-8082.2017.01.026 Abstract ( )   PDF (390KB) ( )   The main restriction factors affecting machine-transplanted rice were analyzed, 63 pieces machine transplanted field in Gushi County as the research object. The results showed that the major restriction factors of high yield and high benefit of machine-transplanted rice include: the varieties were planted in a large number and confusion; the sowing rate was too large and the seeding age was too long, the plant density was relatively small; the phosphate and potash fertilier was less, the fertilization only as basal and tillering fertilizer with no panicle fertilizer, the tillering fertilizer was one-time plowing and the proportion was low.

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Effects of Different Density and Fertilizer Management on Yield of Mechanical Transplanting Rice Wuyunjing 30 2017, 23(1): 110-111.  DOI: 10.3969/j.issn.1006-8082.2017.01.027 Abstract ( )   PDF (250KB) ( )   The effects of different density and fertilizer management on yield of mechanical transplanting rice were studied, with Wuyungeng 30 as material. The results showed that the yield is higher under the condition of plant specifications 29.7 cm×9.9 cm and 5.3 plants/hill. The author put forward some suggestions: turning down the row spacing, increasing grabbing seedlings and using panicles fertilizer at the time of 4th and 2nd to flag-leaf with 10 kg/667 m2 urea or 9 kg/667 m2 urea+9 kg/667 m2 compound fertilizer.

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Effects of Different Fungicides and Spraying Times on Rice Sheath Blight 2017, 23(1): 112-114.  DOI: 10.3969/j.issn.1006-8082.2017.01.028 Abstract ( )   PDF (376KB) ( )   A field experiment was carried out to explore different fungicides and spraying times on rice sheath blight. The results showed that the control effects of azoxystrobin 25% suspension concentrate （1 350 g/hm2）, thifluzamide 24% suspension concentrate （345 g/hm2） and propiconazole 25% emulsifiable concentrate （600 g/hm2） on rice sheath blight were more than 87%, and the effects of tebuconazole 43% suspension concentrate was 74.38%. Compared with validamycin 20% wettable powder, the control effects of 4 fungicides on the field efficacy were improved by 0.79 times, 0.75 times, 0.69 times and 0.43 times, respectively, the comprehensive income per hectare were increased by 6499 yuan, 4042 yuan, 2051 yuan and 1913 yuan. According to the control effects and economic benefits azoxystrobin 25% SC, thifluzamide 24% SC and propiconazole 25% EC could be popularized as the main local pesticides in controlling rice sheath blight.

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Discussion on Rice Breeding Test Base Planning on the Yunnan-Guizhou Plateau 2017, 23(1): 115-117.  DOI: 10.3969/j.issn.1006-8082.2017.01.029 Abstract ( )   PDF (459KB) ( )   The authors engaged in rice breeding for many years, have rich experiences in site planning of breeding base, designing field trials, tractor plough road and ditch, supporting facilities and equipment. According to the need of rice breeding, the planning and design of rice breeding base and the integrated technology were introduced in this paper.