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1.清除田间大草大豆田植株较密,杂草不易除净。夏锄时,漏掉的杂草遇到合适的雨水条件会迅速长成大草,不仅与大豆争夺养分,而且影响通风透光,降低产量,必须予以拔除。一般要拔除2—3次,直到在大豆植株上部看不见大草为止。生长在地面的小草则不必费工铲除。2.促进生育 如果大豆生长量不足、矮小,或者叶片发黄,则要进行追肥,促进其生长发育。在初花期每亩追施硫酸铵7.5公斤;如大豆生育迟缓,有晚熟的可能,可用0.3％磷酸二氢钾液或3％过磷酸钙液喷洒全株,每亩用肥液50公斤。过磷酸钙浸出液的制法是,用1.5公斤过磷酸钙,浸在7.5—10公斤清水中,经24小时后滤出残渣再加水至50公斤。3.防止徒长
1. clear the field of plants in the grass field more dense, weeds are not easy to remove the net. Summer hoe, miss the weeds meet the appropriate conditions of the rain will quickly grow into large grass, not only compete with the nutrients for soybeans, but also affect the ventilation and light, reduce production, must be removed. Generally 2-3 times to be removed until the upper part of the soybean plants can not see the big grass. Grass growing on the ground does not have to be eradicated. 2. Promote fertility If the lack of growth of soybeans, short, or yellow leaves, it is necessary to top-dressing to promote their growth and development. At the beginning of flowering per acre topdressing 7.5 kg of ammonium sulfate; such as soybean retardation, the possibility of late maturity, available 0.3% potassium dihydrogen phosphate solution or 3% superphosphate spraying the whole plant, fertilizer with 50 kg per mu. SSP supernatant preparation method is to use 1.5 kg of superphosphate, immersed in 7.5-10 kg of water, after 24 hours the residue was filtered off and add water to 50 kg. 3. Prevent leggy