几年前并始的关于水土保持实验的挖掘茶丛分析方法还在继续进行着。徐了对根的形态学和干物质分组的研究外,已经又对挖掘出的灌木树内的各个部份进行了化学分析以便对其氮、磷、‘钾和其他营养元素的含量作出估算。--‘“在种植前,从实验区取出深度在0到30厘米之间鲍土壤禅品,由化学分析说明了:假定在三十厘的深度内每公顷有土壤四百万公 A few years ago and the beginning of the soil and water conservation experiments on the analysis of tea clumps continue. In addition to his research on root morphological and dry matter subdivisions, various parts of the excavated shrub tree have been chemically analyzed to estimate their levels of nitrogen, phosphorus, potassium and other nutrients. - "Before the planting, remove from the experimental zone a depth of between 0 and 30 centimeters. The chemical analysis shows that, assuming a depth of thirty centimeters, there are four million hectares of soil per hectare