掺混尿素对水稻产量及氮肥农学利用率的影响

Effects of Bulk Blending Urea on Rice Yield and Nitrogen Fertilizer Agronomic Efficiency

在2009年水稻生长季,以高产水稻品种准两优527为试验材料,研究了掺混尿素(缓速比7∶3)对水稻产量及氮肥农学利用率的影响。结果表明,随掺混尿素施用量的增加,插秧后分蘖数、叶片SPAD值、干物质积累量均显著增加,子粒产量呈先增加后降低趋势,施氮量为225kg/hm2时子粒产量达最大;每公顷施纯氮180kg的掺混尿素处理B3与普通尿素处理CK比较,其分蘖数、叶片SPAD值、干物质积累量、子粒产量及氮肥农学利用率均显著提高,表明施用掺混尿素比普通尿素更有利于提高生物产量、经济产量及氮肥农学利用率。施用量为225kg/hm2的掺混尿素B3处理,最终子粒产量最高,达到11208.6kg/hm2,比普通尿素增10.1%,氮肥农学利用率为10.6kg/kg,是掺混尿素运筹最优处理。

The study was conducted to investigate the effects of the bulk blending urea（BBU）on rice yield and nitrogen fertilizer agronomic efficiency（NAE）,with the high-yield-cultivar Zhunliangyou 527,in 2009.The results indicated that, with the increasing of BBU rate,tiller number,SPAD value,and accumulation amount of dry matter,increased as well. While grain yield changed as a signal modal curve.And when the fertilizer rate increased to 225 kg/hm 2,grain yield reached the peak.Compared B3 and CK,which had the same nitrogen fertilizer rate and different fertilizer forms（BBU and normal urea respectively）,the tiller number,SPAD value,accumulation amount of dry matter,grain yield and NAE of B3 were all larger than that of CK.It was indicated that BBU was superior to improve biological yield,grain yield and NAE.Based on the above results,it was suggested that,under the condition of this experiment,the treatment of B3 was the best treatment,gaining the highest grain yield as 11 208.6 kg/hm2,which increased 10.1%than CK,and much higher NAE as 10.6 kg/kg,even at a normal nitrogen fertilizer rate as 225 kg/hm2.