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In the spring, various crops enter an accelerated growth phase. This period is a key period for spraying foliar fertilizer. The preparation method of some foliar fertilizer is introduced.
The urea solution is usually used at a concentration of 0.5% to 1%, that is, 0.5 to 1 kg of urea plus 100 kg of water. Urea with a biuret content of more than 1.5% cannot be used as a foliar fertilizer.
The urine washing solution has two functions of supplying nitrogen and killing cockroaches. Remove 0.5 to 1 kg of urea, add 100 kg of water, and dissolve it into 70-100 g of washing powder. With the spray, it can not be placed for a long time.
The biogas slurry dilution liquid biogas slurry is rich in available nitrogen, which is easily absorbed by the leaves and has a quick fertilizer effect. Take 10 kg of filtered biogas slurry and apply 100 kg of water. Use immediately after dispensing to avoid nitrogen volatilization.
Potassium dihydrogen phosphate solution
300 g of potassium dihydrogen phosphate plus 100 kg of water sprayed.
Potassium sulfate solution is usually used in a concentration of 1% to 1.5%, and potassium chloride is added in an amount of 1 to 1.5 kg in 100 kg of water.
The grass ash leaching liquid takes 5-7 kg of fresh grass ash, and 100 kg of water is added. After stirring, it is placed for 14 hours, and the clarified liquid is sprayed.
The superphosphate leaching solution has the effect of supplementing phosphorus and controlling cotton pests. Take 2 to 3 kg of calcium phosphate, add 100 kg of water and stir well. After standing for 24 hours, filter and remove the filtrate.
The NPK mixed solution is prepared by dissolving 100 kg of a 2% to 3% concentration of superphosphate leaching solution, and then adding 0.3 to 0.5 kg of urea and 1 to 1.5 kg of potassium sulfate.
The ferrous sulfate solution is taken from 200 to 300 g of ferrous sulfate and 100 kg of water is added. Because the iron fertilizer has poor fluidity in the blade, it should be sprayed several times, sprayed and sprayed finely, and the front and back of the blade should be sprayed. It is better to add 50-70 grams of washing powder to 100 kg of iron fertilizer aqueous solution.
Foliar spray of rare earth micro-fertilizer aqueous solution can increase chlorophyll content and enhance photosynthesis. The spray concentration is 0.08% to 0.1%. Add 80-100 ml of rare earth micro-fertilizer per 100 kg of water.
The zinc sulfate solution is taken from 100 to 200 g of zinc sulfate, and 100 kg of water is added. If a small amount of lime water is added to the prepared zinc sulfate aqueous solution, the effect of spraying the zinc fertilizer can be improved.
The borax solution is taken from 200 to 300 g of borax, and 100 kg of water is added. Because borax dissolves slowly in cold water, it can be dissolved in 4~5 kg of 45 °C warm water, then add water 95-96 kg.
The manganese sulfate solution is taken from 50 to 100 g of manganese sulfate, and 100 kg of water is sprayed.
The ammonium molybdate solution is taken from 50 to 100 g of ammonium molybdate and 100 kg of leaf spray is added.
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