Characteristics of Soybean Absorbing Fertilizer Soybean is divided into three periods. The seed is germinated until the beginning of flowering, and the flower is in the middle stage from the beginning of flowering to the end of flowering. The peak of nitrogen uptake in soybean is at the flowering stage, and the peak of phosphorus uptake is in the flowering to pod-forming stage, but it is very sensitive to phosphorus in the seedling stage, and the peak of absorption of potassium is in the pod-forming stage. Soybean absorption of nitrogen fertilizer during the whole growth period is “less, more, lessâ€, and the absorption of phosphorus is “more, less, moreâ€. Therefore, it is necessary to pay attention to the nitrogen supply during the flowering period, and the phosphate fertilizer is better as the base fertilizer and the seed fertilizer. Fertilization of soybean requires 2 to 5 kg of nitrogen, 5 to 7.5 kg of phosphorus, and 7.5 to 10 kg of potassium. It is equivalent to 20 to 30 tons of farmyard manure, 8 kg of urea, 20 to 25 kg of superphosphate, and 10 kg of potassium chloride or potassium sulfate. Soybean nitrogen fertilizer can be used as base fertilizer, seed fertilizer or top dressing. Phosphate fertilizer is applied as base fertilizer or seed fertilizer once, and potassium fertilizer is used as base fertilizer.
Base fertilizer and seed fertilizer 1, base fertilizer. The base fertilizer is mainly based on farmyard manure, and mixed with phosphorus and potassium fertilizer. Generally, 20 acres of farmer's fertilizer, 2.5 kg of urea, 20-25 kg of superphosphate, about half a month with composting, 2 to 3 ash of planting ash when planting, fully mix well, ditch or apply. 2, seed fertilizer. The fertilizer is applied without the application of base fertilizer or a small amount of base fertilizer. Generally, 10-15 kg of calcium phosphate and 3-5 kg ​​of ammonium nitrate or 5 kg of ammonium phosphate are applied per mu. The depth of fertilization is 8 to 10 cm, and the seed is 6 to 8 cm.
Whether the topdressing soybeans are topdressed with nitrogen fertilizer depends on the previous fertilization situation. If the base fertilizer is not applied and the soil fertility level is low, a small amount of nitrogen fertilizer may be applied at the initial flowering stage, generally 4 to 5 kg per mu or 5 to 10 kg of ammonium nitrate, and the distance between the top and bottom of the soybean plant should be 10 About centimeters. When the soil is deficient in phosphorus, the phosphate fertilizer should be supplemented in the top dressing. The ammonium phosphate is the ideal nitrogen and phosphorus topdressing of soybean. Do not apply nitrogen fertilizer to plots with high soil fertility levels. The top dressing can be in the full flowering stage or the final flowering stage. Multipurpose urea and ammonium molybdate. Urea is applied for 1 to 2 kg, potassium dihydrogen phosphate is 75 to 100 g, and water is added to 40 to 50 kg.
When zinc is planted, 0.5 to 1 kg of zinc sulfate per acre or 0.2 to 0.3% zinc sulfate solution is sprayed on the leaf surface at the seedling stage and early flowering stage. The effective boron content of the soil is less than 0.5 mg / liter, and the boron application effect is remarkable. A 0.1% concentration of boric acid or borax may be used as a root spray.
Molybdenum-molybdenum fertilizer can be mixed with seeds, used as seed fertilizer or deep root application. 1. Seed dressing: 1 to 2 grams of ammonium molybdate per kilogram of seed is placed in a porcelain pot and dissolved in water. The amount of water can be mixed with wet seeds without leaving the fertilizer liquid, and dried after sowing. 2, external fertilization: use 0.05% ~ 0.1% ammonium molybdate, 50 kg per acre solution, sprayed from the seedling stage to the flowering. 3, seed fertilizer: 10 grams per acre of ammonium molybdate plus water dissolved with potassium phosphate or farmyard manure for seed fertilizer application or acupoint application. (Cao County Agricultural Bureau)
Excerpted from: Shandong Science and Technology News
Base fertilizer and seed fertilizer 1, base fertilizer. The base fertilizer is mainly based on farmyard manure, and mixed with phosphorus and potassium fertilizer. Generally, 20 acres of farmer's fertilizer, 2.5 kg of urea, 20-25 kg of superphosphate, about half a month with composting, 2 to 3 ash of planting ash when planting, fully mix well, ditch or apply. 2, seed fertilizer. The fertilizer is applied without the application of base fertilizer or a small amount of base fertilizer. Generally, 10-15 kg of calcium phosphate and 3-5 kg ​​of ammonium nitrate or 5 kg of ammonium phosphate are applied per mu. The depth of fertilization is 8 to 10 cm, and the seed is 6 to 8 cm.
Whether the topdressing soybeans are topdressed with nitrogen fertilizer depends on the previous fertilization situation. If the base fertilizer is not applied and the soil fertility level is low, a small amount of nitrogen fertilizer may be applied at the initial flowering stage, generally 4 to 5 kg per mu or 5 to 10 kg of ammonium nitrate, and the distance between the top and bottom of the soybean plant should be 10 About centimeters. When the soil is deficient in phosphorus, the phosphate fertilizer should be supplemented in the top dressing. The ammonium phosphate is the ideal nitrogen and phosphorus topdressing of soybean. Do not apply nitrogen fertilizer to plots with high soil fertility levels. The top dressing can be in the full flowering stage or the final flowering stage. Multipurpose urea and ammonium molybdate. Urea is applied for 1 to 2 kg, potassium dihydrogen phosphate is 75 to 100 g, and water is added to 40 to 50 kg.
When zinc is planted, 0.5 to 1 kg of zinc sulfate per acre or 0.2 to 0.3% zinc sulfate solution is sprayed on the leaf surface at the seedling stage and early flowering stage. The effective boron content of the soil is less than 0.5 mg / liter, and the boron application effect is remarkable. A 0.1% concentration of boric acid or borax may be used as a root spray.
Molybdenum-molybdenum fertilizer can be mixed with seeds, used as seed fertilizer or deep root application. 1. Seed dressing: 1 to 2 grams of ammonium molybdate per kilogram of seed is placed in a porcelain pot and dissolved in water. The amount of water can be mixed with wet seeds without leaving the fertilizer liquid, and dried after sowing. 2, external fertilization: use 0.05% ~ 0.1% ammonium molybdate, 50 kg per acre solution, sprayed from the seedling stage to the flowering. 3, seed fertilizer: 10 grams per acre of ammonium molybdate plus water dissolved with potassium phosphate or farmyard manure for seed fertilizer application or acupoint application. (Cao County Agricultural Bureau)
Excerpted from: Shandong Science and Technology News
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