蘖肥运筹方式对机插双季稻群体动态和产量的影响

Effects of Tillering Fertilizer Management on Group Dynamics and Yield of MachineTransplanted Double Cropping Rice

以中早39、H优518为供试品种,采用对比法,研究了蘖肥插后第5天1次施、按4︰6比例分插后第5天和第12天2次施、插后第10天1次施3种运筹方式对机插双季稻群体茎蘖动态和产量的影响。结果表明:等氮且等量施用基、蘖、穗肥条件下,3种蘖肥运筹方式对双季稻盛蘖期的同期茎蘖数、成穗率、有效穗数、每穗总粒影响较大,对结实率和千粒质量影响较小。早晚两季产量均以按4︰6比例分插后第5天和第12天2次施处理最高,其次是插后第5天1次施处理,2者产量差异不显著,与插后第10天1次施处理的产量差异显著(早季)或极显著(晚季)。并就如何根据机插双季稻生育特性、及田间禾苗生长实况科学施用蘖肥提出了参考建议。

Using Zhongzao 39 and H you 518 as test cultivars, the effect of group dynamics and yield of machine-transplanted double cropping rice was studied by comparing in three methods that first application of tillering fertilizer on the 5th day after transplanting, second application on the 5th day and 12th day after tiller fertilizer transplantation at 4:6 ratio, and first application on the 10th day after transplanting. The results showed that under the condition of equal nitrogen and equal amount of base, tiller and panicle fertilizer, the three tillering fertilizer management methods had great influence on the number of tillers, panicle rate, effective panicles and total grains per panicle at the same period of full tillering stage of double cropping rice, but had little effect on seed setting rate and 1000-grain quality. The yield of early and late season was the highest when second application on the 5th and 12th day after 4:6 ratio transplanting, followed by the first application on 5th day after transplantation, with no significant difference in yield between the two treatments, and significant difference (early season) or extremely significant (late season) with the first application on the 10th day after transplantation. Some Suggestions on how to use tillering fertilizer according to the growth characteristics of machine-transplanted double cropping rice and the actual growth of field seedlings were put forward.