The quick-acting fertilizer is dissolved in water and sprayed onto the leaves of the crop. It can enter the flesh in more than 10 minutes, and it can be used in a few hours. For example, when cotton leaves are sprayed with urea, the leaves turn from yellow to green after 3 days, and the roots are topdressed for 7 days.
High fertilizer efficiency, general root topdressing, the utilization rate of fertilizer in the season is only 25% to 70%, while foliar application is as high as 90%.
The dosage is small, and the fertilizer is applied evenly outside the root. For example, the amount of urea per 667 square meters is not more than 1 to 1.5 kilograms, and the amount of root dressing is several times more, and it is difficult to apply uniformity.
The method is simple and the external fertilization only needs to dissolve the fertilizer in the water, and can also be combined with the prevention and treatment of pests and diseases and chemical agents, and it is more than one. The top dressing is more troublesome, and it will cause mechanical damage to the crop due to inadvertent operation.
The effect of increasing yield is obviously as follows: spraying 0.05% ammonium molybdate solution in the peanut fruiting period can increase yield by more than 15%; spraying potassium dihydrogen phosphate or superphosphate in corn flowering and filling stage can promote grouting, increase grain weight and increase yield by 5%. ~7%.
Pay special attention to the effect of fertilization outside the roots, but the amount of fertilization is limited. The foliarity of the leaves is not as good as the roots. Therefore, it cannot replace the root topdressing in the early stage of crop growth, but can only be used as an emergency or remedial measure.
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