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Appropriate concentration of suitable foliar spray for spray concentration: 0.5% to 2% of urea, 0.3% to 0.5% of potassium dihydrogen phosphate, 0.2% to 9.3% of ammonium sulfate, 0.01% of ammonium molybdate, 0.1% to 0.2% of borax, and sulfuric acid Zinc 0.1% to 0.4%. At the same time as the root spray fertilizer can also be added to 10% of the grass ash, 10% of the chicken manure, 10% to 20% of the rabbit manure or decomposed human urine, etc., also have a significant increase in production.
The amount of spray fluid should be sufficient, and the number of times should not be too low. Fertilizer is best when the fertilizer solution will flow from the leaf surface but does not flow down. General fertilizer use 45 kg. Even if sprayed with 1% urea solution, the amount of mu is not more than 2 kg of urea, which is sprayed 2 or 3 times in succession, with an interval of 7 to 10 days.
It is advisable to select fertilization time for foliar fertilization in relatively humid weather and ensure that the leaves are wet for 30-60 minutes. To spray before 10 o'clock in the morning and after 5 o'clock in the afternoon, a cloudy day without wind can be sprayed all day.
During the critical period of spraying, appropriate maize should be sprayed during the filling stage of the flowering season and sprayed when there is a certain detoxification condition. Should focus on spray on the corn stems and leaves, to both sides are sprayed positive. Spraying is meticulous and uniform, without leakage or re-spray.
Pay attention to reasonable mixing, adding two or more than two fertilizers to add active agent can improve fertilizer efficiency, fertilizer and pesticides can also improve ergonomics. However, care must be taken not to mix alkaline and acidic fertilizers with pesticides that will react. And in the fertilizer by adding a small amount of active agent (a small amount of detergent can be added) to reduce the surface tension of fertilizer solution.
Fertilizer varieties should be suitable for urea, potassium dihydrogen phosphate, calcium superphosphate, potassium sulphate, leaching liquid and some micro-fertilizers, etc. as a foliar fertilization effect is better, and chloride-containing, volatile and insoluble fertilizers such as ammonium bicarbonate, chlorine Ammonium, calcium, magnesium, phosphorus, etc. should not be used for foliar application.