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Can soybeans not be applied or less fertilized?
Although soybeans are leguminous crops, Rhizobium can fix nitrogen in the air, but the amount of fixed nitrogen nutrients is limited. The lack of nutrients has adverse effects on the growth and development of soybeans. Nitrogen deficiency, poor plant growth, thin growth, small yellow seedlings, large amounts of flower buds fall off; if there is a lack of phosphorus, the number of branches, the number of nodes, the number of flowers correspondingly reduced; such as soil potassium deficiency, soybeans in plants about 30 cm high, Will begin to yellow from the top of the blade, and gradually extended to the base of the leaves, leaf margin scorch off, a serious loss of the whole plant. Therefore, fertilizer must be added.
What are the characteristics of soybeans that require fertilizer? Soybean is a vegetable crop with high protein and fat content. It requires a large amount of elements such as nitrogen, phosphorus, and potassium, as well as medium and trace elements. Rational application of nitrogen fertilizer can increase grain protein content, increase yield, and improve quality. The application of P fertilizer can promote the growth and development of nodules and increase the number of flower bud differentiation. Application of potash fertilizer can promote the synthesis of photosynthesis and carbohydrates, and improve disease resistance and lodging resistance. Soybean growth period is divided into seedling stage, branching stage, flowering stage, scarring stage and drum grain ripening stage. The demand for nitrogen and phosphorus is less in the early period, more in the medium term, and less in the later period. The demand for potassium is required to be more than 80% from the middle period to the flowering period, and decreases in the later period. Only after understanding these characteristics can we apply scientific fertilization.
Fermented soybeans to grasp what principles?
The principle of fertilizing the soybeans should be organic fertilizer, supplemented by chemical fertilizers, combined organic and inorganic fertilizers, control of nitrogen fertilizers, application of phosphorus and potassium fertilizers, and application of trace fertilizers. The fertilizing step is to apply enough basal fertilizer, timely fertilizer, and flexible application of foliar fertilizer. Basal fertilizer can be applied for about 4,000 kilograms of farmyard manure per acre, or 75-100 kilograms of bio-organic fertilizer, or 50-75 kilograms of bio-organic compound fertilizer, 25-30 kilograms of superphosphate, and 10 kilograms of potash. Normal soybean seedlings do not need to be topdressed at the seedling stage, but the fields with poor soil fertility, insufficient basal fertilizer, weak seedlings, and less rhizobial bacteria should receive 3-4 kg of urea and 15 kg of superphosphate per acre after 10-15 days of emergence. Potassium sulfate 5 kg. During the flowering stage, 5-10 kg of urea and 6-8 kg of potassium sulfate are recovered per mu. In flowering stage, spraying 1% urea and 1%-2% superphosphate mixed solution, or spraying 0.05-0.1% ammonium molybdate or spraying 0.1%-0.2% speed, according to soybean growth. Le boron 1-2 times.
Fermented soybeans
When the author was investigating agricultural production, he saw a lot of places, especially in the suburbs of cities and towns, expanding the soybean planting area. The seeding period of soya bean is very flexible due to its variety. It can be harvested in spring and summer, or harvested in summer. It is one of the crops that farmers like to plant. However, some farmers are selecting soybeans for the first time. There are doubts about fertilization. I do not know what fertilizers to use. I do not know how best to use them. Now some of their doubts are answered as follows: