安徽中籼稻实地养分管理技术研究

Site-specific nutrient management technology for middle-maturing nonglutinous rice in Anhui

以4个中晚熟水稻品种为材料,研究不同时期不同氮肥管理措施下植株氮素含量与氮肥用量及LCC值之间的变化关系。结果表明,植株氮素含量表现为分蘖期>拔节期>抽穗期,LCC值为抽穗期>拔节期>分蘖期。植株含氮量、叶片LCC值与氮肥用量呈密切正相关,氮素含量与LCC值含量显著正相关,分蘖期、抽穗期水稻植株LCC值变化量与氮肥用量变化量显著正相关。依据最高产量处理确定适宜的LCC值临界指标,并计算不同LCC值下水稻所需氮肥追施用量。

In this paper, we analyzed the relationship between the nitrogen content and LCC value of rice plant in different periods under different management for 4 kinds of middle-maturing paddy rice. The result indicates that the nitrogen content in rice at tillering stage is larger than that at jointing stage, and it is least at heading stage. But the LCC value becomes larger from tillering stage, jointing stage to heading stage. The rice plant nitrogen content and LCC value of leaves have a closely positive correlation with the dosage of applied nitrogen at different stages. And the nitrogen content has a significant positive correlation with the LCC value. The changing dosages of rice plant at tillering stage and heading stage have a positive correlation with the dosage of applied nitrogen. The critical target index is fixed according to the management of peak production, as well as different requirements of nitrogen fertilizer with different LCC values.