资兴市东江库区在大面积桔园实施“三改三疏”栽培技术 ,成效显著。柑桔产量由 1994年的平均每666 7ｍ2 4 0 0多ｋｇ ,提高到 1999年的 140 0多ｋｇ ,优质果率比原来提高了 30 % ,取得了良好的经济效益。三改即改良品种、改良土壤、改善基础设施 ;三疏即疏大枝、疏密株、疏花果 Zixing Dongjiang reservoir area in a large area of ​​orange orchard implementation of “three changes three sparse” cultivation techniques, with remarkable results. The output of citrus increased from an average of 6600m2 more than 6600m2 in 1994 to more than 1400kg in 1999. The fruit yield of high quality rose by 30% over the previous year, and achieved good economic benefits. Three changes that improve varieties, improve soil, improve infrastructure; three sparse namely sparse big branches, sparse strains, thinning fruit