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钾肥肥效与土壤、排灌方式的关系 (一)土壤种类与钾肥肥效土壤种类对钾肥肥效的影响,首先是土壤钾素含量和供应状态的影响。我国一般农田土壤含钾通常在1-2％之间,其中绝大部分是不能被植物吸收利用的原生矿物如钾长石、云母之类,而能被作物吸收利用的部分仅占全钾量的0.3-5％。每亩耕层土壤中代换性钾含量的变化幅度很大,约为10-150斤。我国土壤种类繁多,土壤代换性钾含量差异很大。分布在广东、广西、福建、江西南部、浙江西部的红壤性水稻土,广东沿海地区由浅海沉积物发育的砂性土壤,都比较缺钾。这些地区施用钾肥,可以获得较好的增产效果。近年来,我国南方各省(区)在不同土壤上进行的大量钾肥试验肥效表现不同,而同一母质发育的土
Potassium fertilizer efficiency and soil, irrigation and drainage methods (A) soil types and fertilizer efficiency Soil types of fertilizer on the efficiency of K, the first is the impact of soil potassium content and supply status. Potassium in general farmland in China is usually 1-2%, of which the vast majority of primary minerals that can not be absorbed by plants such as potash feldspar, mica and the like, while the portion that can be absorbed by crops only accounts for total potassium Of 0.3-5%. Replacement potassium content per acre topsoil in a wide range of changes, about 10-150 pounds. There are many kinds of soils in our country, and there are great differences in soil replacement potassium content. Red soil paddy soil distributed in Guangdong, Guangxi, Fujian, southern Jiangxi and western Zhejiang and sandy soil developed in shallow coastal sediment in Guangdong coastal areas are relatively deficient in potassium. Potassium fertilizer application in these areas, you can get better yield. In recent years, a large amount of potash fertilizer tests carried out in different soils of southern provinces (districts) in different fertilizers show different effects on fertilizer efficiency, while soil with the same parent material