云南省的南部,西南部海拔1800～2300米山区的荒地,夏秋的水热条件可以满足旱粮(玉米)生育的要求,过去不种夏播油菜。这几年南部(西双版纳州思茅地区)和西南部(临沧、保山等地区)茶叶发展较快,全省每年新垦茶园面积据不完全统计约数十万亩。幼龄茶园过去很少被充分分利用,缺少短期的履盖或遮荫作物,幼茶生长缓慢,水土流失较严重。为 In the southern part of Yunnan Province, the wasteland in the mountains of 1800-2300 meters above sea level in the southwestern part of the country can meet the requirements of the breeding of dry grain (maize) in summer and autumn. In the past, summer rape was not planted. In recent years, the development of tea in the south (Simao area in Xishuangbanna Prefecture) and in the southwest (Lincang and Baoshan areas) has been developing rapidly. According to incomplete statistics, the area of ​​newly planted tea gardens in the whole province is estimated to be about 100,000 mu. In the past, young tea farms were seldom used fully and lacked short-term cover or shady crops. Tea grew slowly and water and soil loss became more serious. for