有机-无机肥配施对水稻产量、品质及氮素吸收的影响

通过田间试验，研究氮施用量相同的条件下，有机肥和化肥不同比例（有机肥氮分别占100%、70%、40%、20%和0%），对早稻、晚稻及单季稻施用对水稻产量、品质和氮素吸收的影响。结果表明，有机肥氮为40%、20%、40%时，早稻、晚稻和单季稻产量最高，分别比单施化肥区增8.5%、2.8%和4.6%。有机肥氮在20%～40%之间，稻米品质较佳，比例过高则稻米易碎、垩白上升和蛋白质含量下降。有机肥氮为20%水稻氮素累积量最高，有利于氮素的吸收、利用。

Effect of combined application of organic and mineral fertilizers on yield, quality and nitrogen uptake of rice

Controlled release nitrogen fertilizers(CRNF) are physically prepared from the granules of the field experiments were conducted to investigate the effects of different ratio of organic and mineral fertilizers(organic N accounted for 100%,70%,40%,20% and 0%,respectively) on yield,quality and nitrogen uptake of early rice,late rice and single-crop rice,under the same application rates of nitrogen.The results show that when organic nitrogen accounts for 40%,20% and 40% of the total amount,yields of early rice,late rice and single-crop rice are highest,which are increased by 8.5%,2.8% and 4.6% respectively compared with the yields of chemical fertilizer areas.When organic N accounts for 20% to 40%,rice quality is better,while higher proportion of organic N can result in rice fragile,increase chalk rate and reduce protein content.When organic N accounts for 20%,N uptake by early rice,late rice and single-crop rice was highest.