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.