Key points of foliar spraying of micro-fertilizer on vegetables

Micro-fertilizer is an indispensable nutrient element in the growth and development of vegetables. spraying foliar fertilizer after diluting micro-fertilizer has the advantages of low cost, quick effect and high benefit. The main technical points are as follows: 1. Spraying concentration. Good results can only be achieved if the concentration is appropriate, especially if the concentration is not too high, otherwise it is not only useless, but harmful. The suitable concentrations of various trace fertilizers sprayed on vegetables are: borax or boric acid 0.05% Mel 0.25%, ammonium molybdate 0.02% Mel 0.05%, Zinc Sulfate 0.05% Mel 0.2%, Manganese Sulfate 0.05% Mel 0.1%, Ferrous Sulfate 0.5% Mel 1%, rare Earth nitrate 0.03% Mel 0.1%, rare Earth Animal and Plant 0.1% 0.15%. 2. Spraying period. The spraying period should be determined according to different varieties of vegetables and different uses of trace element fertilizer, and it is generally appropriate to spray from seedling stage to pre-flowering stage. It is best to spray in cloudy days and in sunny days when the sun is not too strong in the afternoon, in order to prolong the retention time of fertilizer solution on vegetable stems and leaves as much as possible, benefit the absorption of leaves and improve the effect of spraying. 3. The times of spraying. When micro-fertilizer is sprayed as foliar fertilizer, the amount of fertilizer is less, and it is difficult to meet the needs of the whole growth and development stage, so the effect is not good. According to the length of the growing period of vegetables to determine the number of spraying, generally 2-4 times. We should also take measures according to local conditions, vary from dish to dish, and pay attention to the combination of seed treatment (seed soaking, seed dressing) or the application of base fertilizer. 4. Spraying dosage. The spraying amount of trace fertilizer solution should be determined according to the growth of vegetables. the early seedling leaflet should be sprayed less, and in the later stage, the branches and leaves should be sprayed more, which should be limited to the wetting of plant stems and leaves. Spray carefully and evenly so that the leaves are sprayed on both sides. Generally 40-50 kg per mu of fertilizer spraying liquid. 5. Reasonable mixed spraying. Reasonable mixed spraying of micro-fertilizers or mixed spraying with other fertilizers and pesticides can save labor and effort, and can also play the role of "one spray with multiple effects". However, attention should be paid to the physical and chemical properties of fertilizers and pesticides when mixed, and fertilizer efficacy and efficacy should not be affected when mixed with pesticides. In general, all kinds of micro-fertilizers can not be mixed with alkaline fertilizers and alkaline pesticides, and zinc fertilizer should not be mixed with phosphate fertilizer.