施肥对白背飞虱田间种群和水稻产量的影响研究

STUDY ON EFFECTS OF FERTILIZATION ON THE FIELD POPULATION DENSITY OF SOGATELLA FURCIFERA(HORVATH)AND THE RICE YIELD

本文分析了氮、磷、钾化肥及农家肥对白背飞虱田间种群和水稻产量的影响.结果表明:氮素化肥是影响白背飞虱田间种群数量变动的主导因素,磷肥对白背飞虱的发生亦有一定的推动作用,农家肥和钾肥对白背飞虱有微弱的抑制作用.多施氮素化肥,即使配合施用较多的其它肥料,也不能减少田间虫口密度.较多的农家肥配合少量的氮素化肥,既可以减少白背飞虱田间发生量,又有利于提高水稻产量.

The effects of nitrogen fertilizer,phosphatic fertilizer,patash fertilizer and farm ma-nure on the field population density of Sogatella furcifera and the rice yield were studied.The results showed that nitrogen fertilizer.played a leading and promoting part;phosphaticfertilizer played a promoting part to a certain extent;and farm manure and potash fertilizerplayed a feeble inhibiting part on the growth of field population density of S.furcifera,when nitrogen fertilizer was applied mostly,even if combined with rather bigamounts of other fertilizers,the field population density of S.furci fera couldn't be re-duced.It could not only lessen the field population density of S.furcifera but also raise the rice yield to apply more farm manure combined with a small amount nitrogen fertilizer.