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一、低丘红壤茶园钾的农化性质 1.钾的含量状况根据对浙江、安徽、江西、广东、广西、贵州、湖南等地低丘红壤茶园土壤的测定结果,全钾含量在0.93～2.74％范围(见表1)。土壤全钾量的高低与茶园肥力和茶叶产量之间没有明显的相关性,有不少低产茶园全钾含量超过了高产茶园。茶园土壤的全钾量主要取决于土壤的成土母质,据测定的结果,不同母质发育的低丘红壤茶园土壤的全钾含量次序是花岗岩>冲积物>石炭岩>第四纪红土>红沙土>玄武岩≥凝灰岩。土壤母质中的钾是呈结晶矿物态,从表面上看它与茶叶产量无直接的关系,但它在一定条件下会被逐步释放,变成茶树可利用的形态,因此矿物钾是茶园土壤中可贵的钾素“营养库”。 2.钾的释放
First, the hilly red soil tea garden of agrochemical properties 1. Potassium content in Zhejiang, Anhui, Jiangxi, Guangdong, Guangxi, Guizhou, Hunan and other places hilly red soil tea garden soil determination results, the total potassium content of 0.93 to 2.74 % Range (see Table 1). There is no obvious correlation between the total potassium content of soil and the fertility of tea plantation and the yield of tea. There are many low-yielding tea plants whose total potassium content exceeds high-yielding tea plantations. According to the results of determination, total potassium content of tea garden soil with different parent materials is granite> alluvial> calcareous> Quaternary laterite> red sand soil > Basalt ≥ tuff. Potassium in the soil parent material is in a crystalline mineral state. On the surface, it has no direct relation with the yield of tea, but under certain conditions, it is gradually released and becomes available form of tea tree. Therefore, mineral potassium is in tea plantation soil Valuable potassium “nutrition library.” 2. Release of potassium