High Yield Potential and Nitrogen Fertilizer Utilization Characteristics of Different Types of Hybrid Rice Varieties in Xingyi City, Guizhou Province
Received date: 2023-07-24
Online published: 2023-09-15
Three types of hybrid rice varieties with super high yield potential (Yongyou 1540, a indica japonica hybrid rice variety, Rong18 you 2348, a three line indica hybrid rice variety, and Jingliangyou 534, a two line indica hybrid rice variety) were selected to study the effects of different nitrogen application rates (N1, 240 kg/hm2; N2, 285 kg/hm2; N3, 330 kg/hm2) on yield and nitrogen absorption capacity of rice. The results showed that there were significant differences in the response of yield to nitrogen fertilizer among the three hybrid rice varieties. Yongyou 1540 and Rong 18 you 2348 have the highest yield under N3 treatment, reaching 16.83 t/hm2 and 15.64 t/hm2, respectively, and Jingliangyou 534 has the highest yield under N1 treatment, reaching 12.54 t/hm2. Under the highest nitrogen yield conditions, Yongyou 1540 and Rongyou 2348 have higher effective panicles and grains per unit area, reaching 304.18×104/hm2, 279.39, and 324.28×104/hm2, 220.85, respectively, and Jingliangyou 534 has higher thousand grain weight and seed setting rate, reaching 21.11 g and 89.15%, respectively. Moreover, Yongyou 1540 has higher grain number and seed setting rate per ear than Rong 18 you 2348 and Jingliangyou 534. Under the highest nitrogen yield conditions, Yongyou 1540 and Rong 18 you 2348 have higher nitrogen accumulation capacity and utilization efficiency. Jingliangyou 534 has lower nitrogen accumulation capacity, but higher nitrogen utilization efficiency. Yongyou 1540 has higher yield potential and nitrogen absorption and utilization efficiency compared to Rong 18 you 2348 and Jingliangyou 534. Under super-high yield cultivating conditions, Yongyou 1540 can still continue to increase nitrogen application rate to achieve higher yield and nitrogen utilization efficiency. The appropriate nitrogen application rate for Rong 18 you 2348 is 330 kg/hm2, while Jing Liangyou 534 is 240 kg/hm2.
LUO Xikun, LI Min, ZHANG Hengdong, ZHANG Fali, LUO Deqiang, JIANG Xuehai, ZHOU Weijia . High Yield Potential and Nitrogen Fertilizer Utilization Characteristics of Different Types of Hybrid Rice Varieties in Xingyi City, Guizhou Province[J]. China Rice, 2023 , 29(5) : 105 -109 . DOI: 10.3969/j.issn.1006-8082.2023.05.020
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