不同氮肥水平对‘龙粳31’干物质积累的影响

Effects of Different Nitrogen Application Rates on Dry matter Accumulation of Longjing31

[目的]研究不同氮肥施用量对‘龙粳31’关键生育期干物质积累的影响。[方法]以‘龙粳31’为试验材料,设0、60、120、180、210kg/hm25种施氮量,采用随机区组设计。[结果]从分蘖到收获,水稻全株的干物质积累量在逐渐增加,并且在最大施肥量下获得最大的干物质产量;茎、叶的积累分配比例减少的同时穗的积累分配比例增加,但高氮处理前期干物质积累过大不利于成熟期收获器官干物质的积累。[结论]从提高‘龙粳31’产量的角度出发,施氮量不超过180 kg/hm2为宜。

[ Objective] To study effects of N fertilizer application on dry matter accumulation in key growth period of Longjing31. [ Method] Taking Longjing31 as test material, setting 5 kinds of N fertilizer application 0, 60, 120, 180, 210 kg/hm^2, randomized block design was conducted. [ Result] The results indicated that the dry matter accumulation was increased gradually in different rice growth periods. The proportion of dry matter accumulation on stems and leaves reduced when it increased on harvest organs, but too much dry matter was produced in the early growth stage due to the high nitrogen which influence the dry matter accumulation on the harvest organs in mature stage. [ Conclusion] In order to improve Longjing31 yield, nitrogen application amount shouldn＇t exceed 180 kg/hm^2.