山地石榴覆草试验山东枣庄市峰城区石榴中心１９８９年于山地４０年生石榴园进行覆草试验。４月开始覆草，每株覆草５０ｋｇ、草厚１５ｃｍ左右，以后每年４月补覆一次，株用草１５ｋｇ。３年后调查，树盘覆草土壤（０—２０ｃｍ土层）含水量比不覆草高２４５％～６０?.. Mountain pomegranate mulching test Zaozhuang City, Shandong Fengcheng pomegranate center in 1989 in 40-year-old pomegranate garden for grass cover test. April began to cover the grass, grass per plant 50kg, grass thickness 15cm or so, after the annual replenishment once in April, plant 15kg of grass. After 3 years of investigation, the soil cover of tree-covered grass (0-20cm soil layer) was 24.5% ~ 60% higher than that of bare grass.