Fertilizer varieties should be suitable for urea, potassium dihydrogen phosphate, superphosphate, potassium sulfate, ash leaching solution and some micro-fertilizer for foliar application, while chloride-containing, volatile and poorly soluble fertilizers such as ammonium bicarbonate, chlorine Ammonium, calcium, magnesium, phosphorus, etc. should not be used for foliar application.
The suitable concentration of suitable foliar fertilization is: urea 0.5% to 2%, potassium dihydrogen phosphate 0.3% to 0.5%, ammonium sulfate 0.2% to 9.3%, ammonium molybdate 0.01%, borax 0.1% to 0.2%, sulfuric acid Zinc is 0.1% to 0.4%. At the same time, 10% of the plant ash water, 10% of the chicken manure, 10% to 20% of the rabbit manure or the matured man's urine can also be added for the root spray application, and the effect of increasing the yield is also obvious.
The amount of spray liquid should be sufficient, and the number of sprays should not be too small. Foliar application is best when the fertilizer liquid will flow down from the leaf surface but not flow down. The average fertilizer is 45 kg. Even if 1% of the urea solution is sprayed, the amount of the acre is only 2 kg of urea, and it is continuously sprayed 2 to 3 times at intervals of 7 to 10 days.
It is advisable to choose the fertilizer time for foliar fertilization in the damp weather, and ensure that the leaves are wet for 30 to 60 minutes. To spray before 10 o'clock in the morning and after 5 o'clock in the afternoon, the windless cloudy sky can be sprayed all day.
In the critical period of spraying selection, the appropriate part of the corn should be sprayed during the filling stage of the flowering, and should be sprayed in time when some kind of de-fertilization condition occurs. The focus should be on the corn stems and leaves, and both sides should be sprayed with the front side as the main. The spraying force is meticulous and uniform, and does not leak or re-spray.
Pay attention to reasonable mixing, add active agent to mix two or more kinds of fertilizers to improve fertilizer efficiency, and mix fertilizers and pesticides can also improve work efficiency. However, be careful not to mix alkaline and acidic fertilizers and pesticides that will react. Add a small amount of active agent to the fertilizer (a small amount of detergent can be added) to reduce the surface tension of the fertilizer.
(Jia Youjiang, Agricultural Bureau of Yucheng County, Shandong Province)
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