Three "early" soybeans planting
First, early chemical removal. 3-4 days before seedling emergence after sowing, 50% Acetochlor EC 100-150 ml / mu was used to seal the soil of 30-40 kg of water. If there are weeds in the field at the time of application, 20% g 100 ml / mu can be mixed with it. If the soybean has emerged and there is no time to seal the soil, 10% grass EC 60-75 ml / mu, or 15% EC 60-75 ml / mu, or 12.5% grass energy EC 60-75 ml / mu, 40-50 kg of water can be used for stem and leaf treatment. If monocotyledonous and dicotyledonous weeds are mixed, one of the above agents can be mixed with 40% atrazine 80-100 ml / mu, or 25% Huwei 80-100 ml / mu.
Second, set the seedlings early. According to the experiment, the suitable fixed seedling can increase the yield by about 8% and 17% compared with the late fixed seedling. In order to avoid the emergence of linear seedlings and high-legged seedlings, the seedlings should be firmly fixed at the time of 3 leaves and 1 heart. The fixed seedling density should be different from different varieties and different soil fertility, such as Yudou 22, 25 and 16, 10000-12000 plants / mu, 12500-13500 plants / mu, dry and thin land, early-maturing varieties, such as Yudou 20, 23, 15, 14000-16000 plants / mu.
Third, early promotion and control. In the early flowering stage of soybean, if the plant is thin and short, the leaves are small and thin, and the leaves are yellow or light green, nitrogen and phosphorus combined with chemical fertilizer should be applied, 10-20 kg per mu, with diammonium unilateral ditch, which can effectively reduce the shedding of flowers and pods and promote vegetative growth. the effect of foliar spraying with activating element is better. If the plant is overgrown and closed, spraying paclobutrazol 150 mg / kg or 200 mg / kg at the early flowering stage can inhibit plant height, control Internode elongation and reduce growth rate.
The standard appearance of soybean in the early stage should be: bright green leaves, thick leaves, well-developed roots, more dry matter, steady growth and development.
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Soil improvement techniques for soybean cultivation
1. Soil conditions for high soybean yield Soil conditions are the basis for high soybean yield. Soil moisture status, nutrient status and some physical properties of soil are important factors affecting soybean yield. Soybean seeds require more water for germination than cereal crops. The young roots of soybean are soft and have a large moisture content. Suitable soil moisture conditions can promote the young roots to extend to depth. The main root of the plant can reach about 1 meter, and the lateral root can extend parallel to about 0.5 meters. When soil moisture is insufficient, it will affect its vertical and horizontal expansion growth.
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Field management techniques of soybean in the middle and later stage
1. Management of flowering and podding period the main task of this period is to strive for more flowers, early flowering, full flowering, increasing flowers and pods, and preventing the shedding of flowers and pods. It is necessary to look at seedling management, the combination of protection and control, high-yield fields to control mainly, to avoid premature ridge closure, in order to achieve the maximum leaf area at the end of flowering. Specific measures: continue weeding before sealing ridges, look at the seedlings as appropriate after water and fertilizer, early flowering stage should be topdressing for weak seedlings, not topdressing for strong seedlings to prevent overgrowth. The effect of topdressing phosphate fertilizer at flowering and pod stage was obvious, during this period, the leaf area of soybean reached the maximum, water consumption increased, transpiration intensity and water demand.
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