氮肥用量对杂交籼稻Y两优886冠层结构和产量的影响

Effects of Nitrogen Fertilizer Amount on Canopy Structure and Grain Yield of Hybrid Indica Rice Y Liangyou 886

为确定杂交籼稻Y两优886的适宜施氮量和理想群体冠层结构,测定了不同氮素水平下Y两优886的产量、叶面积指数、叶绿素含量、光合辐射利用等指标。结果表明,随着氮肥用量的增加,叶面积指数和叶绿素SPAD值呈逐渐增加趋势,而水稻灌浆-成熟期的PAR截获率、干物质净积累量、PAR转化率、PAR利用率呈先上升后降低的趋势;N390处理的产量最高,叶面积指数、叶绿素SPAD值、PAR利用及转化都达到较高水平。390 kg/hm2是Y两优886合理的施氮量,有利于该品种的高产高效栽培。

In order to make clear the appropriate amount of nitrogen and ideal population canopy structure of indica hybrid rice Y liangyou 886,the yield,leaf area index(LAI),SPAD value,photosynthetic radiation utilization and some other parameters were investigated and analyzed under six nitrogen levels.The results indicated that LAI and SPAD value showed a gradually increasing trend,PAR interception efficiency,net dry matter accumulation,PAR conversion efficiency and PAR utilization efficiency at filling stage showed a trend of increasing at first and then decreasing,with the increase of nitrogen fertilizer.Under 390 kg/hm2 of nitrogen,the grain yield of Y Liangyou 886 was the highest,and LAI,SPAD value,PAR conversion and utilization efficiency also reached a high level.390 kg/hm2 is the appropriate nitrogen fertilizer amount for Y Liangyou 886,which is beneficial to the high yield and high efficiency cultivation.