红壤旱耕地是我国农业土壤的重要资源。由于它是处于湿热气候带的土壤,矿物质的分解及蚀变程度很深,土体受降水的淋洗也较彻底。因此,缺钾或严重缺钾为红壤肥力上的一个普遍问题。加上目前氮、磷化肥用量增加,使作物对钾肥的需求日趋迫切。由于土壤母质的不同和耕作培肥的影响,使红壤旱耕地钾肥力水平相差甚大。为了正确施用钾肥,红壤旱耕地的测土施钾问题将愈显重要。 Red soil dryland is an important resource of agricultural soil in our country. Because it is in a hot and humid climate of the soil, mineral decomposition and alteration of a very deep degree, soil washing by precipitation more thorough. Therefore, potassium deficiency or severe potassium deficiency is a common problem in red soil fertility. Coupled with the current nitrogen, phosphorus fertilizer increased use of crops so that the demand for potash more urgent. Due to the difference of soil parent materials and the effect of tillage and fertilization, the fertility levels of red soil in dryland vary greatly. In order to apply potassium fertilizer correctly, the problem of soil potassium application in the red soil dryland will become more and more important.