水稻高产栽培中肥料运筹对害虫种群的生态学效应

在湘北三熟制区水稻超高产栽培条件下 ,进行了肥料运筹及管理技术对主要害虫发生危害关系的研究。试验结果表明 ,在生产中随着高产栽培技术的变革、施肥对策的改进 ,主要采用以有机肥与无机肥结合施用的方式 ,应用一次性全层施肥的方法 ,在提高施 N量的同时 ,相应提高 P、K的用量和比例 ,增施 Si O2 等技术。这些可控因素对害虫种群密度都具有一定的调控作用 ,并能明显减轻主要稻虫发生数量和为害程度 ,同时也能大幅度提高水稻产量。

Ecological effects of the fertilizer management on pest population in the highyield culture of rice

The relationship between the management of fertilizer and rice culture and the pest population damage has been studied under the super|yielding based tri|rice|cropping system in the west Hunan Province. The result showed the major managements regulate effectively the population and damage degree of the pest and diseases with rice cultural management improved; in the combination of organic manure and chemical fertilizer, the basal dressing at one time before transplanting, the application of SiO 2, and the simultaneous increase both N quantity and the ratio level of N,P,K,Si. And with the yield greatly increased,the occurrence level and harm degree of the pests have been significantly decreased simutaniously.