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1979年起,针对本地区主要土类,模拟三种主要轮作方式,进行了磷肥不同分配施用的盆栽试验,以期提高磷肥肥效,促进平衡增产,增加经济效益.方法和经过供试土壤为石灰性黄潮土.甲组土壤有机质0.725%,全氮0.059%,全磷(P_2O_5,下同)0.121%,速效磷(P_2O_5,下同)18ppm.轮作方式为水稻—小麦;玉米—小麦;大豆—小麦.磷肥分配方式为夏播施磷秋播无磷(P—0);夏播无磷秋播施磷(0—P),夏播秋播各施1/2(P—P)及空白处理(0—0).每盆年施普钙10克.施肥两个轮作周期后,观察三季作物的后效.乙组土壤有机质1.403%,全氮0.089%,全磷0.135%,速效磷23.5ppm.
Starting from 1979, pot experiments on different types of phosphate fertilizers were carried out for three main types of crops in the main soil types in the region to improve the fertilizer efficiency, promote the balanced increase of production and increase the economic benefits.Methods and the soil tested were calcareous Yellow soil.The soil organic matter in group A was 0.725%, total nitrogen 0.059%, total phosphorus (P_2O_5, the same below) 0.121%, available phosphorus (P_2O_5, the same below) 18ppm.The rotation mode was rice-wheat; corn-wheat; soybean-wheat. The distribution pattern of P fertilizer was P-0 in autumn, P-0 in autumn, P-P in autumn, P-P in autumn and sowing in autumn 0-0) .Spots calcium per pot of 10 grams.Application of two rotation cycles, observed the three season crop after effects.A group of soil organic matter 1.403%, total nitrogen 0.089%, total phosphorus 0.135%, available phosphorus 23.5ppm.