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东丰县小四平林场,1988年在红松造林地内间种大豆(面积10亩,12亩为对照),每亩当年收入大豆款82元,苗木成活率高,长势好。具体方法:造林穴状整地,株行距1.5×1.5米,穴面70×70厘米,修成水平坑盘,在每穴中间植红松1株,在苗木左右15厘米处分别种大豆两簇。好处如下:
Xiaofeiping Forest Farm in Dongfeng County. In 1988, soybean was planted in the Korean pine forest (covering an area of 10 mu and 12 mu as the control), with a soybean yield of 82 yuan per acre. The seedling survival rate was high and the growth rate was good. Specific methods: Afforestation cave-shaped soil preparation, spacing of 1.5 × 1.5 meters, hole 70 × 70 cm, repaired horizontal pit plate, in the middle of each hole planted Pinus koraiensis, about 15 cm in the seedlings of two kinds of soybean respectively cluster. The benefits are as follows: