红壤丘陵地大面积温州蜜柑低产园改造技术研究

A STUDY ON THE TECHNIQUE OF TRANSFORMING LARGE-AREA LOW-YIELDING ORCHARD OF SATSUMA(C.RETICULATA BLANCO)IN RED-SOIL HILLY AREAS

1982～1986年以新建县为试验点,根据其红壤丘陵地温州蜜柑低产园形成的主要原因提出并推广了“营造防护林,改变桔园小气候;广种绿肥,扩穴改土,合理施肥,增强树势;因树修剪,随树造形;推广“九二○”与环割促花保果;预防冻害,保叶过冬和及时防治病虫害”等主要技术措施,取得了明显的效果。树势恢复很快,树冠覆盖率由1981年的8.3%上升到1986年的66.8%,产量大幅度增加,全县总产由1981年的0.45万千克上升到1986年的134万千克,平均每年以212.45%的速度递增。达到了“一年恢复树势,二年见果,三年投产,四年,大面积丰收”的目的。

Xinjian County was taken as the experimental point from 1982 to 1986.According to the main causes of low-yielding Satsuma orchard in red-soil hillyareas,the following measures were proposed and taken with significant re-sults:to plant shelter belt,change the local climate,plant green manure crops,widen the pits and improve the soil,apply fertilizer properly,enhance thevigour of the trees,prune the trees rationally,promote the flowers and protectthe fruit by means of the application of gibberellin and“ring cutting”,protectthe trees from freezing harm and keep leaves through winter.The vigour of thetrees recovered rapidly.The cover rate of the tree crown increased from 8.3%in 1981 to 66.8% in 1986,and the total output of the county increased from4500 kg to 1340000kg,with the annual rate of 212.45%,reaching the targetof“recover the vigor in the first year,bear fruit in the second year,put intoproduction in the third year and win rich harvest in large area in the fourthyear”.