幼龄苹果树下覆盖试验我镇３００亩３年生苹果覆膜后发生烂根死树现象，为探讨其原因，进行了不同地面覆盖处理试验。试验地处南坡山下，棕壤土。试验共设４个处理：①３月份覆膜；②３月份覆膜，５月份温度升高去膜换草，９月份再覆膜；③３月份覆草；④清耕对照各处埋均... Young apple trees under the cover test My town 300 acres of 3-year-old apple after the occurrence of rotten tree dead tree phenomenon, in order to explore the reasons for the different ground cover test. Test is located in the southern slope of the hill, brown soil. A total of four treatments: ① in March of filming; ② in March of filming, in May the temperature increase to membrane-exchange grass, in September and then covered; ③ mulching in March; ④ Qingbang control buried everywhere ...