1982年,本县建立了大面积板栗密植园,株行距为1× 2m(333株/亩)和2×3m(111株/亩),品种为金丰、石丰、海丰等,土壤为沙壤上,含有机质0。47%,有水浇条件。由于密度太大,前期虽单产较高,但很快树势衰弱进入低产阶段,据1989年对其中26亩调查,平均冠径为1.25m,树势极弱,平均每株仅 In 1982, the county established a large-area chestnut close planting plant with a spacing of 1 × 2m (333 trees / mu) and 2 × 3m (111 trees / mu). The cultivars were Jinfeng, Shifeng, Haifeng, Sand soil, containing 0.47% organic matter, water conditions. As the density is too high, although the high yield in the previous period, but soon the weakness of the tree enters the low-yield stage. According to the survey of 26 mu in 1989, the average crown diameter is 1.25m and the tree vigor is very weak.