氮肥调控对粳稻穗部性状的影响

在总施氮量300.00kg/hm2的条件下,采用基蘖肥与穗肥不同的配比,研究了氮肥调控对粳稻穗型的影响。结果表明,基蘖肥氮与穗肥氮配比为6∶4的处理,千粒重和一、二次枝梗的饱粒数最多,强弱势粒质量均大于其他处理。单穗总粒数与一、二次枝梗数和粒数呈极显著正相关,与二次枝梗着粒数呈极显著负相关,与二次枝梗结实率呈显著负相关,单穗实粒数与一次枝梗饱粒数呈极显著正相关,与一次枝梗粒数和着粒数呈显著正相关,单穗结实率与一、二次枝梗数呈显著负相关,与一、二次枝梗结实率呈显著正相关,与二次枝梗粒数呈极显著负相关;穗型指数与单株穗数呈极显著负相关,与穗粒数呈显著正相关;着实粒密度与穗粒数呈显著负相关。

Effects of Nitrogen Fertilizer Regulation on Panicle Traits of Keng Rice

In the case of 300.00 kg/ha total N supply,the influences of different ratios of base tiller fertilizer to panicle granule fertilizer on the panicle traits of keng rice(Oryza sativa spp.japonica) were investigated.The results indicated that,when the nitrogen ratio of base tiller fertilizer to panicle fertilizer was 6∶4,1 000-grain weight and full grain number in the primary or secondary branches were the largest,and the quality of superior and inferior grains were greater than other treatments.Besides,the total grain number per panicle had a significantly positive correlation with the numbers of primary and secondary branches and grains,but had a significantly negative correlation with the grain number and seed setting rate of secondary branch.The filled grain number per panicle was positively correlated with the filled grain number(very significant),grain number and spikelet number(significant) of primary branch.The seed setting rate per panicle was negatively related with the number of primary and secondary branches and the spikelet number of secondary branch,but had a positive correlation with the seed setting rate of primary and secondary branches.The spike-type index had a significantly negative relation with the panicle number per plant and a significantly positive relation with the grain number per panicle.The ripening grain density was negatively correlated with the spike grain number.