Soybean is one of the crops that require more fertilizer. Fertilization should be considered based on its trait characteristics, soil fertility and cultivation measures. Under normal circumstances, each production of 100 kg of soybean seeds requires absorption of 7.0-9.5 kg of nitrogen, 1.3-1.9 kg of phosphorus, and 2.5-3.7 kg of potassium. Among them, the most demanding nitrogen, followed by potassium, also requires sufficient sulfur, copper, molybdenum, boron, zinc and other trace elements.
Micro-fertilizer seed dressing with rhizobial powder: 20-30 grams of rhizobium powder and 250 grams of water per 5 kg of seeds. Mix the seeds and powder thoroughly in the pot, dry and sown. Micro-fertilizer seed dressing: Before planting, weigh 5-10 grams of ammonium molybdate per 5 kg of seeds, fully dissolve ammonium molybdate with 250 g of warm water, then spray the fertilizer on the seeds to make the fertilizer and seeds fully contact and dry. After drying, you can sow. For plots with boron deficiency or zinc deficiency, seed dressing should be carried out with 0.05% borax solution or 0.1% zinc sulfate solution.
It is better to apply base fertilizer to the base fertilizer to apply organic fertilizer. Generally, 2000-3000 kg of high-quality farmyard manure is used per mu, and a small amount of fertilizer can be used. Due to the tight time, summer soybeans can be based on quick-acting organic fertilizers or chemical fertilizers. In the land with low soil fertility, 6-7 kg of nitrogen should be applied per acre, and 10-12 kg of phosphorus and potassium should be applied. For the fertile land, the nitrogen application rate should be 4-5 kg, and phosphorus and potassium should be 8-10 each. Kg, plowed after spreading.
Skillful application of topdressing and topdressing of soybeans should be carried out in accordance with the ground and the seedlings. For those plots where the base fertilizer is not applied or the base fertilizer is insufficient, it is necessary to carry out topdressing in time. Generally, 3-4 kg of urea or 10-15 kg of ammonium bicarbonate per mu per mu is used. Kg and potassium fertilizer 10 kg. Nitrogen fertilizer can be chased half at the seedling stage and early flowering stage. Phosphorus and potassium fertilizer should be chased early, and the method of topdressing should be applied as a ditch; for the land where the base fertilizer is applied, it should be topdressed according to the growth of each stage. The seedlings are weak and yellow, and the nitrogen fertilizer can be supplemented in an appropriate amount to prevent premature aging. The flowering and pod-forming period is the period when the soybean needs the most fertilizer. The quick-acting fertilizer should be applied 5-7 days before flowering. The urea can be applied with 2-5 kg ​​of urea and 7-8 kg of potash per mu to ensure the plant in this period. Growing the need for nutrients.
The root-to-be-fertilized soybean enters the flower-pod stage, which requires a variety of nutrient elements. After the drum-grain period, the roots of the plant begin to age, and the absorption capacity decreases. Soybeans often cause early decay due to lack of fertilizer. Soybean leaves have a strong absorption capacity for nutrients. Foliar spray fertilizer can prolong the functional period of the leaves, and has a significant promoting effect on drum sticking, generally increasing yield by 10%-20%. The method is: 1 kg of diammonium phosphate or 0.5-1 kg of urea or 1.5-2 kg of superphosphate, or 0.2-0.3 kg of potassium dihydrogen phosphate 50-60 kg per acre, sprayed on a sunny day (such as The superphosphate should be pre-soaked for 24-28 hours, then filtered and then sprayed. The sprayed part is preferably the back of the blade. Spray once every 7-10 days from the beginning of the pod, even spray 2-3 times.
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