The northeastern three provinces and Inner Mongolia's Dongsheng League have long been the core soybean-producing regions in China. In recent years, the total area dedicated to soybean cultivation has ranged between 36.7 to 40 million hectares, accounting for about half of the country’s overall soybean planting area. Among these, Heilongjiang Province alone contributes approximately 30% to 35% of the national soybean output. However, with the removal of wheat price protections in northern areas, farmers have shifted toward more profitable crops, leading to a significant reduction in soybean acreage. Meanwhile, thermophilic crops like corn face limitations due to insufficient accumulated temperatures, prompting a transition from "maize areas" to true "soybean areas."
In Jilin Province, although the soybean area is not as large, overgrazing remains a challenge. In key soybean regions such as Yanbian and Dunhua, farmers often alternate between soybean-corn-soybean or soybean-soybean-corn rotations. This practice can significantly affect both the quality and yield of soybeans. According to data, soybean yields decrease by 6.1% when planted every other year, 9.9% in one-year rotation, 13.8% in two-year rotation, and 19.0% in three-year rotation. Implementing soybean re-planting control technologies can help mitigate these negative impacts.
Environmental factors play a crucial role in soybean production. Variations in yield are influenced by multiple factors: differences in soil fertility, regional climate, topography, rainfall patterns, fertilization practices, previous crop history, disease prevalence, land renovation status, and irrigation availability. The eastern four leagues of Inner Mongolia show similar conditions to neighboring provinces, while the Huomeng region faces issues comparable to those in northern Heilongjiang, where the problem is particularly severe.
Today, I’d like to discuss three main points: first, the impact of soybean replanting on yield and quality; second, the reasons behind this issue; and third, effective prevention techniques.
Soybean replanting leads to a decline in grain weight, increased disease and insect infestation rates, and a noticeable drop in product quality. In Heilongjiang and Fujin, the average weight of 100 grains was found to be 18.2 grams, which is 2.7% lower than that of Zhengyu soybeans. In heavily replanted fields, the average weight dropped to 18.0 grams, a 3.7% decrease. Disease and insect damage rates increased by 39.7%, and the rate of diseased grains rose by 95.5%. While protein and fat content remain stable in the short term, prolonged replanting leads to higher protein levels and lower fat content over time.
New plant growth regulators like Huaguo Nurse and Wei Miao contain seaweed polysaccharides, alginic acid, and highly unsaturated fatty acids. These substances enhance flower bud formation, improve flowering, protect fruits, increase fruit set, promote fruit enlargement, and ultimately boost yield and quality. They also improve soil health and crop resilience.
Using the “Bonnie†series of plant growth regulators on wheat seeds increases amylase and respiratory enzyme activity, accelerates nutrient conversion, promotes germination, and improves seedling emergence. During the seedling stage, foliar spraying of high-potassium alginate can stimulate leaf growth, increase tillering, and lay the foundation for high yields.
At the heading stage, applying the “Bonnie†series helps accelerate spike differentiation, allowing wheat to spike up to five days earlier and extending the grain-filling period. During the filling phase, spraying Huaguo Nurse and Wei Miao reduces leaf senescence, enhances photosynthesis, and boosts nutrient transfer to grains, increasing grain weight.
During the ripening stage, high-potassium alginate spray promotes grain development, increases protein and amino acid content, and improves wheat quality. It also enhances cold and drought resistance. Under low temperatures, it reduces electrical conductivity, increases linolenic acid, thickens leaves, and improves water potential, making plants more resistant to frost. Under drought, it promotes root growth, enhancing water absorption and reducing damage from dry hot winds.
Additionally, sodium alginate, a natural soil conditioner, increases organic matter in the soil, activates beneficial microorganisms, and improves soil structure, enhancing nutrient availability and promoting healthier plant growth.
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