氮镁配施对水稻龙粳20群体茎数动态的影响

目的]探讨氮镁对龙粳20水稻(Oryza sativa L.)群体茎数动态的影响机制。方法]以氮、镁为变量,采取裂区设计,构建不同群体,研究氮镁耦合对早粳稻龙粳20群体茎数动态的影响。结果]低氮配合低镁或高氮配合高镁时群体最高茎数较多;单独施用时以低镁处理收获穗数较多,镁与氮肥配合施用后,施硫酸镁225.0 kg/hm2时收获穗数较多;施氮量与群体有效分蘖率呈典型的单峰曲线,施用镁肥对有效分蘖率无明显影响。结论]该研究可为施用氮镁调控水稻群体质量提供理论依据。

Effects of Nitrogen(N) and Magnesium(Mg) Application on Stems Number Dynamic of Long-jing 20 Rice(Oryza sativa L.) Populations

Objective] The aim was to discuss the effect mechanism of N and Mg application on stems number dynamic of Long-jing 20 rice populations.Method] Choosing N and Mg as variables and constructing different rice populations by split plot design,the effects of N and Mg coupling on stems number dynamic of early japonica rice Long-jing 20 populations.Result] The results showed that stems of rice populations were the most under the match of low N and low Mg or high N and high Mg.The spike number was more only applying low Mg,while under the condition of applying N and Mg at the same time,the spike number was also more when the application amount of MgSO4 was 225.0 kg/hm2.The nitrogen application amount and effective tillering rate of the population showed a typical single peak curve,while the magnesium application amount had no significant effect on the rate of effective tillering.Conclusion] The study provides a theoretical basis for applying N and Mg to control rice populations quality.