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Effects of Planting Density with Bowl Mechanical-transplanting Method on Yield and Population Quality of Double-cropping Late Rice
2017, 23(6):
23-31.
DOI: 10.3969/j.issn.1006-8082.2017.06.005
In order to study the effects of planting density with bowl mechanical-transplanting method on yield and population quality of double-cropping late rice and identify the suitable planting density, a field experiment was conducted using indica hybrid rice Wufengyou T025, indica-japonica hybrid rice Yongyou 538 and conventional japonica rice Xiaoyechishu with five planting densities (D1, 33 cm ×12 cm; D2, 33 cm ×13 cm; D3, 33 cm ×14 cm; D4, 33 cm ×15 cm; D5, 33 cm ×16 cm), and the conventional blanket seedling mechanical-transplanting as control(CK, 30 cm×13.2 cm). The experimental results were as follows: (1)The yield of the three types of rice increased with the increase of the density, under the same density, the yield of D1 treatment was significantly higher than that of CK, and the average yield of two years increased by 8.13%~9.50%; (2)The number of stems and tillers of nutrition bowl mechanical-transplanting rice were D1>D2>D3>D4>D5, compared with CK, slower reducing rate of tillers after jointing, higher ratio of productive tillers to total tillers at maturity; (3)Dry matter accumulation, population growth rate and photosynthetic potential of nutrition bowl mechanical-transplanting of three type rice were D1>D2>D3>D4>D5 during transplanting to jointing, jointing to heading, heading to maturity, the dry matter accumulation and photosynthetic potential of CK were larger than that of D1 from transplanting to jointing, but the dry matter accumulation, population growth rate and photosynthetic potential of D1 were higher than that of CK from jointing to heading and heading to mature; (4)Dry matter weight of population of nutrition bowl mechanical-transplanting rice during the main growth period showed D1>D2>D3>D4>D5, but the dry matter weight of per stem performed opposite trends; (5)Leaf area index of nutrition bowl mechanical-transplanting rice during the main growth period and the ratio of effective leaf area, ratio of leaf area from flag leaf to 3rd leaf, the ratio of grain to leaf at heading showed a rising trend with the increase of density, the ratio of effective leaf area, ratio of leaf area from flag leaf to 3rd leaf and the ratio of grain to leaf of D1 was significantly higher than that of CK at heading. The results showed that the density of 33 cm×12 cm with bowl mechanical-transplanting of double-cropping late rice is most appropriate.
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