Detailed Explanation of Key Points of Chemical Control Technology in Soybean Cultivation

Using chemical technology to control cultivation is an emerging technology in agricultural production. Applying chemical control cultivation to soybeans can regulate plant growth and development, help increase flowers and preserve pods, and raise yield.

Application of rare earth: Rare earth is also called rare earth micro-fertilizer or rare earth nitrate, and its trade name is Changle Yizhisu. It is a new type of rare earth element fertilizer first created and mainly promoted in China; at the soybean seedling stage and early flowering stage, spraying once each with rare earth solutions at concentrations of 0.03%-0.04% and 0.08% respectively can increase grain protein content by 5.9%, fat content by 8.5%, and yield by 15%-20%. Application of paclobutrazol: Paclobutrazol is also called chlorobutrazol, code PP333, and is a new type of plant growth regulator; applying it to soybeans can dwarf the plants, thicken the stems, shorten the petioles, extend the functional period of the leaves, help ventilation and light penetration and prevent lodging, and can also control soybean mosaic virus, generally increasing yield by about 20%. Application method: from soybean branching to the initial flowering stage, spray 25 kg of 250 PPM paclobutrazol solution per mu.

Application of sodium bisulfite: Sodium bisulfite is a photorespiration inhibitor. Applying it to soybeans can effectively reduce plant respiration intensity, decrease dry matter consumption, and increase yield by an average of 10.5%. Application method: use 8 grams of sodium bisulfite per mu, dilute with 50 kg of water, and spray once each at the initial flowering stage and full flowering stage of soybeans.

Application of triiodobenzoic acid: 2,3,5-triiodobenzoic acid is a multi-effect plant hormone. Applying it to soybeans can inhibit apical dominance, promote axillary bud development, dwarf the plants, increase branching, and thicken the stems, helping ventilation and light penetration and lodging resistance, and promoting yield increase.

According to experiments, at the initial flowering stage and full flowering stage of soybeans, spraying once each with solutions at concentrations of 100 PPm and 200 PPm respectively, 50 kg per mu each time, can increase the number of flowers by 25%-40%, reduce the flower and pod abscission rate by 7%, increase the number of pods per plant by 5-12.6, increase 100-grain weight by 0.5 grams, promote early maturity by 5-7 days, and increase yield by 5%-23%.

Application of Zengchanling: Zengchanling is also called 4-iodophenoxyacetic acid and is a plant growth stimulant; from the full flowering stage to the pod-setting stage of soybeans, spray with 20-30 PPM Zengchanling solution once every 7-10 days, for a total of 2 sprays, 50 kg-75 kg per mu each time, which can increase the number of flowers per plant by 20%, reduce the flower and pod abscission rate by 10%, and increase yield by 3%-15%.