Vegetable foliar fertilizer application is stressful

The application of foliar fertilizer in vegetables is an effective measure to adjust crop nutrition. It has the advantages of simple method, convenient use, low cost and high benefit, especially suitable for trace element topdressing.

Foliar fertilizer should be sprayed in a targeted manner according to the needs of the crop. Foliar spray fertilizer for cabbage, cabbage, celery, amaranth and other leafy vegetables that require more nitrogen should be mainly urea, and ammonium bicarbonate can also be used. The concentration of fertilizer solution is generally 2% urea, 1.5% ammonium carbonate, 50-60 kg per acre, and 2-4 times per season. For nitrogen, phosphorus and potassium, various melons, tomatoes, peppers and other melons and vegetables should be balanced. Foliar fertilizer should be applied with three-component compound fertilizer, or a mixture of nitrogen, phosphorus and potassium fertilizers, such as potassium dihydrogen phosphate solution. Compound fertilizer liquid, potassium sulfate, superphosphate, urea mixed liquid, and the like. 50 kg of spray fertilizer per acre, 3-5 times per season.

Reasonable mixing and rational mixing of two or more kinds of fertilizers for spraying, the effect of increasing yield is remarkable, and it can also be mixed with pesticides, which is both pest control and disease prevention, but should not be mixed at will, such as potassium dihydrogen phosphate can not be mixed with rare earth, filtered Human excrement can not be mixed with grass ash leaching solution, etc. If you do not follow the mixing principle and blindly mix, it will reduce the efficacy and fertilizer efficiency.

Precautions 1. Before spraying foliar fertilizer, it is best to first diagnose the deficiency, so as to find out what fertilizer is needed, the effect is obvious. The spraying of the fertilizer should be moderate, and the leaves of the plant are generally evenly covered with misty water droplets, so that it is not suitable for dripping. Second, the application period and location should be appropriate, leafy vegetables are generally applied in the early and middle stages of growth, solanes, melons, beans, roots and stems are generally applied in the middle and late stages; root vegetables are sprayed at the beginning of tuber and tuber expansion Can promote rapid increase and significantly increase production. Third, as a fertilizer for foliar spray fertilizer, it should not be used for a long time, especially a mixture of three fertilizers of nitrogen, phosphorus and potassium, it is not suitable for a long time. In addition, it is necessary to refill the spray within 24 hours after spraying. Onion and garlic vegetables should not be sprayed with potassium chloride and human excrement containing more chloride ions.