In spring, crops enter a rapid growth phase, making it an essential time for foliar fertilization. Proper application of foliar fertilizers can significantly enhance crop development and yield. Here are several effective preparation methods for different types of foliar fertilizers.
Urea solution is commonly used at a concentration of 0.5% to 1%, meaning 0.5 to 1 kg of urea mixed with 100 kg of water. However, urea with a biuret content exceeding 1.5% should not be used, as it may harm the plants.
Another option is a urine washing solution, which serves both as a nitrogen source and an insecticide. Mix 0.5 to 1 kg of urea with 100 kg of water, then add 70–100 g of washing powder. This mixture should be used immediately after preparation to avoid loss of effectiveness.
Biogas slurry, when diluted, provides available nitrogen that is quickly absorbed by leaves, offering a fast-acting fertilizer effect. Use 10 kg of filtered biogas slurry mixed with 100 kg of water, and apply it right away to prevent nitrogen from evaporating.
Potassium dihydrogen phosphate solution is prepared by dissolving 300 g in 100 kg of water. For potassium sulfate, a concentration of 1% to 1.5% is typical, using 1 to 1.5 kg per 100 kg of water. Potassium chloride can also be applied similarly.
To make grass ash leaching liquid, mix 5–7 kg of fresh grass ash with 100 kg of water. Let the mixture sit for 14 hours, then spray the clear liquid. Superphosphate leaching solution helps supplement phosphorus and control pests like cotton aphids. Use 2–3 kg of calcium phosphate in 100 kg of water, let it stand for 24 hours, then filter and spray.
An NPK mixed solution can be made by first preparing a 2% to 3% superphosphate leaching solution, then adding 0.3–0.5 kg of urea and 1–1.5 kg of potassium sulfate.
Ferrous sulfate solution requires 200–300 g of ferrous sulfate dissolved in 100 kg of water. Since iron does not move well within plant leaves, it should be sprayed multiple times, covering both sides of the leaves. Adding 50–70 g of washing powder per 100 kg of solution improves its effectiveness.
Rare earth micro-fertilizer solutions can boost chlorophyll levels and improve photosynthesis. A concentration of 0.08% to 0.1% is recommended, which translates to 80–100 ml of rare earth solution per 100 kg of water.
Zinc sulfate solution is made by dissolving 100–200 g in 100 kg of water. Adding a small amount of lime water can enhance the absorption of zinc.
Borax solution needs 200–300 g of borax in 100 kg of water. Since borax dissolves slowly in cold water, it’s best to dissolve it in 4–5 kg of warm (45°C) water first, then top up with the remaining 95–96 kg of water.
Manganese sulfate solution is prepared by mixing 50–100 g in 100 kg of water. Ammonium molybdate solution uses 50–100 g of ammonium molybdate in 100 kg of water for foliar application.
By following these methods, farmers can optimize their foliar feeding practices, ensuring crops receive the necessary nutrients efficiently during their critical growth stages.
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