不同氮肥水平对文昌市水稻产量的影响

以水稻品种"特优458"为试验材料,采用大田随机区组试验,设置不同氮肥水平处理,研究不同氮肥水平对水稻生物性状、产量及肥料利用率的影响。结果表明:氮肥对水稻的生长发育有很大的影响,在低氮条件下,施用氮肥能显著提高水稻株高、千粒重、结实率、产量等生物性状;但当氮肥用量达到一定程度时,株高、千粒重、结实率、产量等指标随着氮肥用量的增加反而会逐渐变小。当氮肥用量为300kg/hm²时,经济效益达到最高,与对照区相比,经济效益增收率为72.2%。综合考虑生物性状、经济效益、肥料利用率和贡献率等因素,该地区最适合的氮肥用量为300kg/hm²。

Effects of Different Nitrogen Fertilizer Levels on Rice Yield in Wenchang

By using"Teyou 458"as the experimental material,a plot experiment was conducted to study the effects of different nitrogen fertilizer levels on biological characters,rice yield and fertilizer utilization rate.The results showed that nitrogen fertilizer had a great effect on the growth and development of rice.Under the low nitrogen condition,application of nitrogen fertilizer could significantly increase rice plant height,thousand seed weight,seed setting percentage,yield and other biological characters.However,when the nitrogen application rate reached a certain level,the rice plant height,thousand seed weight,seed setting percentage and yield decreased gradually with the increase of nitrogen application rate.When the nitrogen fertilizer rate was 300 kg/hm2,the economic benefit reached the highest,and compared with the contrast area,the yield increase rate of economic benefit was 72.2%.Comprehensively considering the biological characters,economic benefit,fertilizer utilization rate,contribution rate and other factors,the most suitable nitrogen fertilizer rate in this area is 300 kg/hm2.