在我国长江中下游广大茶区,夏秋季由于雨量分布不均匀,气温高,蒸发量大,往往形成干旱,致使夏秋茶产量不高。一般夏秋茶只占全年产量的40—50&,因此,夏秋茶的增产潜力是很大的。茶树原产我国西南高原一带,在系统发育过程中形成了耐荫喜湿的特性。据研究,土壤的相对持水量以70～80&最宜茶树生长;土壤相对持水量在40—50&时,茶树芽 In the vast tea area in the middle and lower reaches of the Yangtze River in China, summer and autumn tea yields are not high due to the uneven distribution of rainfall, high temperature and large evaporation. The general summer tea only accounts for 40-50% of the annual output, therefore, summer tea yield potential is great. Tea tree native to China’s southwestern plateau area, formed in the process of phylogenetic characteristics of shade-tolerant. According to the study, the relative water holding capacity of the soil is 70 ~ 80% and the optimum tea grows; when the soil relative water holding capacity is 40-50%