论文部分内容阅读
目前,我们的化肥利用率很低,N 肥:小麦为27—41%,棉花46%,玉米52—78%。P 肥:小麦为8—14%,玉米10—25%。为提高化肥利用率,现根据国外资料综述如下,供参考.1.连续施 N 肥减产。澳大利亚学者马逊(Mason)于1964—1974年,在三个试点对麦田多年大量施硫铵,每年376公斤/公顷,发现产量下降,原因是降低了土壤 PH 值和交换盐基,提高了交换性氢,有效铝和锰,而减了镁和钾,影响小麦植株发育,使产量降低。
At present, our fertilizer utilization rate is very low, N fertilizer: wheat is 27-41%, cotton 46%, corn 52-78%. P fertilizer: wheat is 8-14%, corn 10-25%. In order to improve the utilization of chemical fertilizers, we summarize the following information for reference: 1. Continuous application of N fertilizer to reduce production. Mason, an Australian scholar, found large quantities of ammonium sulphate at 376 kg ha -1 per year for many years in three pilot wheat fields in 1964-1974, noting that yields were reduced due to lower soil pH and the exchange of base and increased exchange Sexual Hydrogen, Available Aluminum and Manganese, Reduced Magnesium and Potassium, Affecting Wheat Plant Development, Reducing Yield.