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紫泥土又叫紫色土,系紫色沙页岩风化而成的,是我国南方丘陵、山区的一类重要土壤,仅四川一省,紫色土的面积就约达7,000万亩(其中耕地约3,000多万亩),占全省农耕地的70％。紫泥土的特征特性 (一)硅铝率高,胶体品质好,盐基丰富,宜种范围广。土壤肥力高低的一个重要标志,就是看土壤胶体品质好坏。土壤胶体中除有机胶体,微生物胶体外,土壤矿质颗粒小于0.1％毫米时,即具有类似胶体的功能,产生较大的表面能和一定量的电荷,有较好的保水、保肥和供水供肥能力。土壤胶体中矿质胶体占90％以上,而矿质胶体的优劣,主要看硅铝率含量的高低。紫泥土含硅铝率高,一般在3以上,
Purple soil, also known as purple soil, is a weathered purple sandstone shale. It is a kind of important soil in the hills and mountains of the south of China. Only in one province of Sichuan, purple soil covers an area of about 70 million mu Mu), accounting for 70% of the province’s farmland. Characteristics of purple soil (A) high silica content, colloidal quality, rich base, should be planted a wide range. Soil fertility is an important indicator of the level of soil colloidal quality is good or bad. Soil colloids in addition to organic colloids, microbial colloids, soil mineral particles less than 0.1% mm, that is similar to the colloidal function, resulting in a large surface energy and a certain amount of charge, better water retention, fertilization and water supply Fertility. Soil colloids in mineral colloids account for more than 90%, while the advantages and disadvantages of mineral colloids, mainly to see the level of silica content. Zitong silicon-aluminum content is high, generally more than 3,