Yield-affecting factors and cultivation of hybrid rice,"Ⅱ You 1259"
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摘要: 对Ⅱ优1259的产量构成因素进行分析,结果表明,每穗粒数与产量的相关系数达极显著水平,结实率与产量的相关系数达显著水平,有效穗、千粒重对产量的影响也较大,但未达显著水平。有效穗与每穗粒数的负相关达极显著水平。通径分析表明,每穗粒数、有效穗、结实率、千粒重对产量的直接通径系数分别为0.9293、0.7349、0.5720、0.2920。为了探讨Ⅱ优1259高产栽培技术,运用最优设计,进行移栽叶龄、密度、施氮量、施钾量4项栽培措施研究并建立产量与4项栽培措施的回归模型,结果表明,影响产量的主要因素是移栽叶龄、密度和施氮量。经微机模拟筛选出高产的技术措施是:4.5~5.8叶移栽,每公顷插21.75万~29.55万丛,施纯N 122.3~207.4 kg,施K2O 56.8~200.9 kg。Abstract: "Ⅱ You 1259" is an indica combination for middle-late rice hybrid bred by.The study on factors affecting yield for "Ⅱ You 1259" indicated that the spikelet number per panicle and yield positively and significantly correlated at 0.01 level;the seed setting rate and yield significantly correlated at 0.05 level;the panicle number and 1000 grain weight did not significantly correlate.The panicle number and spikelet number per panicle negatively and significantly correlated at 0.01 level.The results of path analysis indicated that direct path coefficients of spikelet number per panicle,panicle number,seed setting rate,1000 grain weight to the crop yield were 0.929 3,0.7349,0.5720 and 0.2920,respectively.To study the high-yielding cultivation methods for "Ⅱ You 1259," 4 factors were targeted(i.e.,planting density x1,age of transplanting leaf x2,nitrogen application rate x3 and potassium application rate x4)and optimized.The regression models of the 4 factors and yield were established.The results showed that the main influential elements for yield included the age of transplanting leaf,planting density and nitrogen application rate.After simulated screening and optimal selection using computer software,the optimized cultivation conditions for high rice yield were seedlings with 4.5~5.8 leaves for transplanting,planting density at 217500~295500 hills per hm2,N applied at a rate of 122.3~207.4 kg N per hm2 and K at 56.8~200.9 kg K2O per hm2.
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Key words:
- Hybrid rice /
- Ⅱ You 1259,yield components /
- optimization /
- effect analysis /
- simulated and optimal selection /
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[1] 佟立伟.多元统计分析计算机程序[M].北京:中国农业科技出版社,1995:240-250.
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