Vegetable foliar fertilizer technical points Source: China Fertilizer Information Network Category: Technical Articles Update Time: 2008-11-21 17:24:37 Read 22 times vegetable foliar fertilizer is fertilizer dissolved in water and sprayed onto foliage Fertilization method is simple, convenient, low cost, effective, and high efficiency. It is especially suitable for top-dressing of trace elements and has a positive effect on increasing the yield and quality of vegetables, but it must be scientific and reasonable.
First, the type of fertilizer should be appropriate. There are many kinds of fertilizers suitable for vegetable foliage dressing, commonly used are urea, potassium dihydrogen phosphate, superphosphate, potassium phosphate, zinc sulfate, rice vinegar, borax, rare earth and ash extraction, and volatile and insoluble fertilizers are not suitable. , Such as ammonium bicarbonate, calcium magnesium phosphate fertilizer.
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Second, the depth of spray fertilizer should be appropriate. The suitable concentration of foliar fertilizer is: 1%-2% of urea; 0.2%-0.5% of potassium dihydrogen phosphate; 0.2%-0.3% of ammonium sulfate; 0.03%-0.1% of borax; 1%-2% of superphosphate; 0.3%; rare earth 0.3%-0.1%.
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Third, the amount of spray fertilizer should be sufficient. When spraying, the leaves of the plants are evenly covered with mist-like small water droplets. It is advisable not to drip, generally requiring 40-60 kg of fertilizer per acre.
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Fourth, the spray site should be properly. The main part of the foliar dressing is the young stems and leaves of the vegetables, and the front and back shall be sprayed.
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Fifth, the application period should be appropriate. Leafy vegetables are generally applied in the early and middle stages of growth; Solanaceae, melons, beans and rhizomes are generally applied in the middle and late stages.
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Sixth, the number of spraying should be appropriate. General foliar topdressing 2-3 times, once every 7-10 days.
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Seven, pay attention to the application time. The foliar dressings are mostly chosen to be sprayed in sunny afternoon when the sunlight is not strong enough so as to prolong the moistening time of the fertilizer solution on the vegetables and improve the fertilizer efficiency. For example, after 3 hours of spraying, the rain should be sprayed after sunny, but the concentration should be appropriate. reduce.
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Eight, fertilizer should be applied reasonably. When dressing vegetable leaves, two or more types of fertilizers should be properly mixed and the effect of increasing production should be significant. However, they cannot be used arbitrarily. For example, potassium dihydrogen phosphate cannot be mixed with rare earths. The filtered human waste cannot be mixed with the ash extraction solution. Zinc phosphate cannot be mixed with superphosphate.
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Nine, fertilizer should be applied rationally. Phosphorus-containing fertilizers such as superphosphate are sprayed after immersed for 24 hours, diluted with 1%-2% of the supernatant, and sprayed with potash ash supernatant diluted with potassium for 2 hours.
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10. Choose suitable fertilizer according to the type of vegetables. Leaf vegetables, such as cabbage, celery, spinach and other foliar fertilizer use more urea, potassium dihydrogen phosphate; solanaceous fruit, melons such as tomatoes, cucumbers and other use of nitrogen, phosphorus, potassium or multi-component fertilizer; Root vegetables such as potatoes, radishes, onions, etc. use more phosphorus and potassium fertilizers.
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