Soybean chemical control technology
Using chemical technology to control cultivation is a new technology in agricultural production. The chemical control cultivation of soybean can regulate the growth and development of the plant, increase the flower, protect the pod and increase the yield.
The application of rare earth is also called rare earth micro fertilizer or rare earth nitrate, and its trade name is Changle Yiphysu. It is a new type of rare earth fertilizer pioneered and popularized in China. Spraying rare earth solution with concentrations of 0.03%, 0.04% and 0.08% respectively at seedling stage and early flowering stage of soybean could increase grain protein content by 5.9%, fat content by 8.5%, and increase yield by 15% and 20%. The application of paclobutrazol, also known as pp333, is a new type of plant growth regulator; when applied to soybean, it can dwarf the plant, thicken the stem, shorten the petiole, prolong the functional period of leaves, help ventilation and light transmission and prevent lodging, and can also treat soybean mosaic disease, generally increasing yield by about 20%. Application method: 25 kg of 250ppm paclobutrazol solution was sprayed per mu from branch to early flowering stage of soybean.
The application of sodium bisulfite is a photorespiration inhibitor, which can effectively reduce the respiration intensity of the plant, reduce the dry matter consumption, and increase the yield by 10.5% on average. Application method: use 8 grams of sodium bisulfite per mu, 50 kilograms of water, spray once in the early flowering stage and full flowering stage of soybean.
The application of triiodobenzoic acid 2, 3, 5-triiodobenzoic acid is a multi-potent plant hormone, which can inhibit apical dominance, promote axillary bud development, dwarf plant, increase branches and sturdy stem, which is beneficial to ventilation and light transmission, lodging prevention and yield increase.
According to the experiment, in the early flowering stage and full flowering stage of soybean, spraying 100ppm and 200ppm solution with the concentration of 50 kg per mu could increase the number of flowers by 25% 40%, reduce the shedding rate of flowers and pods by 7%, increase the number of pods per plant by 5 ~ 12.6, increase the weight of 100 seeds by 0.5g, mature 5 ~ 7 days early, and increase yield by 5% to 23%.
The application of Yancheng Lingchengling, also known as 4-iodophenoxyacetic acid, is a plant growth stimulant; during the period from flowering to podding of soybean, 20~30ppm solution was sprayed once every 7 to 10 days, a total of 50 kg to 75 kg per mu, the number of flowers per plant increased by 20%, the shedding rate of flowers and pods decreased by 10%, and the yield increased by 3% and 15%.
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Control methods of soybean yellow-bellied lamp moth
The larva of yellow-bellied lamp moth is called caterpillar and leaf caterpillar, which is one of the main seedling pests of soybean. At the same time, this pest can also harm corn, millet, sunflowers, vegetables, weeds and fruit trees. 1. Morphological characteristics: the adults of Spodoptera litura are white, and there are many black spots on the forewings. The abdomen and back are yellow, with a black spot in the center of each segment, two black spots on each side, black stripes on the feet and yellow on the femoral nodes. The egg is hemispherical, the first birth is milky white, and then becomes grayish yellow; the back and ventral surface of the larvae are yellowish yellow.
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Causes of flower and pod shedding in soybean
1. Poor ventilation and light transmittance sunlight is not only the main energy for the production and accumulation of organic nutrition, but also the main factor for promoting plant rapid development and inhibiting overgrowth. Soybean has good ventilation and light transmission, which can make the climate between plants consistent with that of the upper part of plants, reduce the humidity between plants, increase light and temperature, accelerate leaf area transpiration and accelerate the speed of nutrient transport. 2. The loss of flowers and pods in barren soil is more than that in fertile soil. The soybean with shaded branches and leaves grows more normally than the plant, and the flowers and pods of the ventilated and transparent soybean fall off.
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