氮肥对寒地水稻齐穗后干物质积累及产量的影响

为给寒地水稻高产栽培提供依据,采用不同的氮肥处理,研究了氮肥对水稻产量和干物质的影响,以及齐穗后干物质重与产量之间的相互关系。结果表明:氮肥对水稻产量和水稻不同时期的叶片、茎鞘及总干物质重都有明显的增加作用,但过度增加氮肥,不仅干物质重增加不明显,而且也达不到高产水平。水稻齐穗期的干物质重与产量呈二次曲线关系,最佳值为9 228±300kg.hm-2;水稻齐穗至成熟期干物质积累量与产量呈正相关关系,y=1.1099x+1 960.6(R2=0.9899)。

Effects of Nitrogen Fertilizer on Dry Matter Accumulation after Full Heading Stage and Yield of Rice in Cold Region

In order to provide the theory basis for rice high yield cultivation in cold region,the effects of nitrogen fertilizer on rice yield and dry matter,and the relationship between dry matter after full heading stage and yield were studied.The results showed that nitrogen fertilizer could significantly increase rice yield and dry matter weight of leaf,stem,sheath and entire plant in different periods.But under conditions of the excessive nitrogen fertilizer,not only dry matter was not increased significantly,but also yield did not reach high level.Dry matter weight at full heading stage and yield had a conic relationship,and the best value was 9 228±300 kg·hm-2.Dry matter accumulation after full heading stage had a positive relationship with the yield.The eqation was,y=1.1099x+1 960.6(R2=0.9899).