氮硫配施对水稻的效应研究

试验结果表明 ,早稻施硫和晚稻施氮均有极显著的增产效果 ,增产率分别达5 .1 %～ 9.9%和 32 .6%～ 38.5 % ,但早、晚稻施氮、硫的交互效应均不显著 ;晚稻施硫能明显增加株高 ,但在同时施氮的条件下 ,结实率会明显下降 ;增施氮肥和硫肥 ,均能明显提高水稻对氮、硫的吸收量 ;施用硫肥可提高氮肥利用率 3.74～ 1 1 .4个百分点 ,施用氮肥可提高硫肥利用率 1 2 .8～ 35 .3个百分点 ;从经济效益和环境保护的角度考虑 ,在水稻生产中以 1 2 0kg/hm2 氮与 30kg/hm2 硫配合施用的效果最好

Study on Interactive Effect of Nitrogen and Sulfur on Rice

The experimental results showed that sulfur fertilization on early rice and nitrogen fertilization on late rice could extremely significantly increase rice yield, the rate of yield increase being 5.1%～9.9% and 32.6%～38.5% respectively, but the interactive effect of nitrogen and sulfur on early and late rice was not significant. Sulfur fertilization on late rice could obviously increase the plant height of rice, but under the condition of applying nitrogen simultaneously, it could markedly decrease the setting rate of rice. Both applying nitrogen fertilizer and applying sulfur fertilizer could significantly enhance the rate of nitrogen and sulfur uptake of rice. Sulfur fertilization could enhance the recovery of nitrogen fertilizer by 3.74%～11.4%， nitrogen fertilization could enhance the recovery of sulfur fertilizer by 12.8%～35.3%. In view of economic benefit and environment protection, the combinative application of nitrogen at 120kg/hm2 and sulfur at 30kg/hm2 had the best effect on rice.