掺混尿素施用量对杂交水稻产量及氮肥偏生产力的影响

Effects of Bulk Blending Urea at Different Rate on Hybrid Rice Yield

以高产水稻品种准两优527为材料,进行6种不同掺混尿素(缓速比为7∶3)施用量试验,研究其产量和氮肥偏生产力的变化。结果表明,随掺混尿素施用量的增加,分蘖数和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,子粒产量达最高。施氮量同为180kg/hm2条件下,掺混尿素处理B3与普通尿素处理CK比较,其分蘖数、干物质积累量、子粒产量及氮肥偏生产力均显著提高。总之,在本试验条件下,施掺混尿素225kg/hm2,子粒产量最高,比CK增产10.1%,氮肥偏生产力也较高,是掺混尿素超高产运筹模式;施氮量为135kg/hm2的掺混尿素B2处理,子粒产量与CK相当,比CK节氮25%,为掺混尿素安全运筹模式。

The effects of the bulk blending urea（BBU）on rice yield of the high-yield-cultivar Zhunliangyou 527 were investigated in 2009.The results indicated that the SPAD value of leaves and accumulation amount of dry matter increased following the increased of BBU rate with the.grain yield and border effect of nitrogen fertilizer changed as a unimodal curve,that is,when the fertilizer rate increased to 225kg/hm^2,grain yield reached the peak;whereas the fertilizer rate increased to 135kg/hm^2,border effect of N fertilizer reached the peak.On the other hand,partial factor of productivity of N fertilizer（PFP）decreased with the increased of N fertilizer.Compared B3 to the control（CK）,which had the same nitrogen fertilizer rate,SPAD value,accumulation amount of dry matter,grain yield and PFP of B3 were all higher than that of CK,indicating that BBU could lead to improved biological yield,grain yield and PFP.Based on the above results,it was suggested that,under the condition of this experiment,the treatment of B3 was the best treatment for high grain yield and B2 was the best treatment for safe rice production.