摘要:
在龙海市设置杂交水稻氮肥试验,结果表明:在所试验氮肥施用量范围内,杂交水稻分蘖期各器官的干物质积累和群体生长率与施氮量呈线性相关,中、后期除叶片外,茎鞘、穗及全株的干物质积累和群体生长率与施氮量呈抛物线型相关;群体生长率与叶面积呈高度正相关,与净同化率呈一定程度的负相关;稻谷产量与干物质总积累量呈高度正相关,并与施氮量呈抛物线型相关。在试验条件下,杂交水稻每公顷目标产量11000kg的适宜施氮量为200kg,平均生产100kg稻谷施氮1.8kg,其中穗粒肥占30%～40%。
关键词:
-
杂交稻 /
-
氮肥 /
-
施用量 /
-
相关性
Abstract:
Experiments of N fertilizer applied to hybrid rice were carried out in Longhai.The results showed that dry matter accumulation and CGR had a linear relationship with N fertilizer applied at tilling stage of hybrid rice.Except those in leaves,dry matter accumulation of stems and sheaths,ears,whole plant and CGR correlated parabolically with N fertilizer applied to the hybrid rice at the middle-to-late stage of the crop.CGR significantly correlated with leaf area and somewhat negatively correlated with NAR.To improve CGR,N fertilizer application must be carried out at a reasonable rate so that the leaf area and NAR would reach an optimal balance.The rice yield was significantly correlated to the dry matter accumulation.It showed a parabolic correlation with N fertilizer application.In this experiment,the optimum dose of N fertilizer for hybrid rice was 200.0 kg·hm-2 for a target yield of 11000 kg. And,to produce 100.0 kg grain,it needed 1.8 kg N fertilizer on average,in which 30% to 40% went for the ear-grain fertilization.
点击查看大图
下载:
