First, in addition to early. After 3-4 days before sowing, soybeans are sown with 50% acetochlor EC 100-150 ml/mu, 30-40 kg of water is sealed in the soil. If there is already weeds in the field, 20% can be added. Trace 100 ml/mu mixed with it. If the soybeans have emerged, it is too late to close the soil, and 10% chlorimethanol EC may be used for 60-75 ml/mu, or 15% spermatozoa may be used to kill 60-75 ml/mu of EC, or 12.5% ​​of Nigrosin EC 60-75. Ml / mu, 40-50 kilograms of water for stem and leaf processing. If single and dicotyledonous weeds are mixed, one of the above-mentioned agents may be used in combination with 40% Kezhiling agent 80-100 ml/mu, or 25% Huwei 80-100 ml/mu.

Second, early set seedlings. According to the experiment, the fixed Dian seedlings can increase production by 8%-17% compared with the late Ding seedlings. In order to avoid the emergence of linear seedlings and tall seedlings, we should pay close attention to seedlings when we have 3 leaves and 1 heart. The seedling density must distinguish between different varieties and different soil fertility, medium-middle fertility, and large late-maturing varieties of plants, such as Yudou No. 22, No. 25, and No. 16 Liumiao 10 000-12000/mu; middle-fertility plots 12500. -13,500 strains/mu; drought thin, early maturing varieties, such as Yudou No. 20, No. 23, No. 15 Liumiao 1,400-16000 plants/mu.

Third, early warning. In the early flowering period of soybean, if the plants are thin and short, the leaves are small and thin, and the leaves are yellow or light green, nitrogen and phosphorus should be top-dressed with chemical fertilizer, 10-20 kilograms per mu, and diammonium unilateral furrows can effectively reduce flowering. The pods fall off and promote vegetative growth. The effect of spraying with vegetal foliar is better. If the plants are long and closed, they can be sprayed with paclobutrazol 150 mg/kg solution or full bloom 200 mg/kg solution at the early flowering stage, which can inhibit the plant height, control the internode elongation, and reduce the growth rate.

The standard length of early soybean is corresponding to: green leaf color, leaf hypertrophy, developed root system, more dry matter, and robust growth.

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