Outside the roots of corn, fertilizer is sprayed on the leaves, through the stomata and stratum corneum into the interior of the leaves for corn absorption and utilization. Its advantages are: less fertilizer, quick effect. According to experiments, in the flowering stage of corn, the 0.2-0.3% potassium dihydrogen phosphate solution is sprayed on the foliar for 1-3 times, the grain weight is increased by 2-12g, and the yield is increased by 3.5-50kg per mu; 4% urea 2 to 3 times, 1000-grain weight increase 2 to 40 grams, increase production per acre 6.5 to 75kg; spray 0.01% ammonium molybdate solution at the heading stage of maize, late corn leaves premature aging, full grain, increase grain weight by 10 to 20g . In addition, chemical elements such as iron, zinc, manganese, etc., which are easily fixed by the soil to form insoluble substances, are difficult to be absorbed by the roots of the corn and often lead to iron deficiency, zinc deficiency, and deficiency of manganese in crops. Top dressing outside the root can supplement the above elements needed for corn growth. In order to increase the effect of foliar spray fertilizer, a small amount of detergent powder may be added to the solution to make the fertilizer solution adhere to the foliage better. The best time to spray fertilizers outside the roots is before 10 o'clock in the morning and after 4 o'clock in the afternoon to avoid the hot phase of noon and keep the leaves in a moist state for a long time to increase the absorption of nutrients. At the same time, 10% of ash water, 10% of chicken manure, 10-20% of rabbit feces or composted urine, etc. can also be added when doing the fertilizer spraying.
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Method for top dressing outside corn