慈溪市黄花梨园一般采用矮密栽培法，即株行距为2×4m。这样投产早、见效快，一般4～5年就开始封行，进入盛产期。但随着园龄的增长，郁闭度的加大，树龄的逐渐老化，致使病虫害逐渐猖獗为害，造成产量不稳定．质量下降，贮运期缩短，最终出现经济效益的下滑。为了改变这种被动 Cixi Huanghua pear orchard generally use short cultivation method, that is, the line spacing of 2 × 4m. This put into operation early, quick, usually 4 to 5 years began to seal the line, into the rich period. However, with the increase of garden age, the degree of canopy density increases and the aging of the tree age gradually leads to the gradual rampancy of pests and diseases, resulting in unstable output. Decreased quality, storage and transportation period shortened, the final decline in economic efficiency. In order to change this passive