汕优2植株氮素营养与产量的构成关系

Relationship between Nitrogen in the Plant of Shan You Ⅱ and Its Yield

对汕优2号四年的植株氮素营养与产量进行通径分析，结果表明：用分蘖始期、分蘖盛期、分化一期、分化三期、孕穗期和齐穗期等6个生育期植株氮的线性回归方程来估测产量，其可靠程度达99．77％；齐穗期的植株氮素营养是影响产量的最重要因子；若植株氮素含量在分蘖盛期和分化三期较低，而其它各生育期均较高，则产量也高。根据研究结果，建议采用“前促、中控、后补”的施肥原则。

The path analysis to nitrogen in the plant of Shan You Ⅱ and its yield in four years was made, It turns out that the yield has been estimated by using the linear regression equations of plant nitrogen in growing periods such as the early tillering and vigorous tillering stages, the first differentiation, the third differentiation, the ear bearing and bearing-finished period, the reliability comes up to 99. 77%. The amount of nitrogen in plants at the bearing-finished period influences the yield most. The lower the amount of nitrogen in the plant at the vigorous tillering stage and the third period of differentiation, but the more at other growing periods, the higher the yield is. As a result of the research, it is therefore suggested that this system can be adopted, that is, the plant is fertilized at the earlier stage, the fertilizer is controled at the intemediate stage and topdressed at the anaphase.