Concentration off. Concentration is suitable to receive good results, application of high concentrations, not only useless, but harmful. In general, the appropriate spraying concentration of various fertilizers is: boric acid or borax solution 0.05%-0.2; ammonium molybdate solution 0.02%-0.05%. Zinc sulfate solution 0.05%-0.2%; copper sulfate solution 0.01%-0.02%; iron sulfate solution 0.2%-1%. Period off. The period of spraying fertilization must be determined according to different vegetable varieties and different types of micro-fertilizers, and it is generally appropriate to spray before flowering. Dosage off. An acre of fertilizer 40 kg -75 kg, can make the stems and leaves of vegetables wet. Times off. Foliar spraying generally uses less fertilizer, so it is difficult to meet the needs of the entire growth and development process at a time. Therefore, it should generally be based on the length of the growing period of vegetables, spraying 2-4 times is appropriate. Time is off. In order to reduce the loss of trace fertilizer in the spraying process, it is beneficial for the blade to absorb, and it should be sprayed on cloudy or sunny days from afternoon to evening. This can extend the residence time of the fertilizer solution on the leaves of the vegetables and help to improve the spraying effect. . Mixed spray. Mixed spraying of micro-fertilizers, or mixed spraying with other fertilizers and pesticides, can save the process and play a role of "a multi-effect". However, it is necessary to pay attention to clarifying fertility and medicinal properties when mixing, and if they are of opposite nature, they will interfere with each other and must not be mixed. All kinds of trace fertilizers should not be mixed with alkaline fertilizers such as grass ash and lime; zinc fertilizers should not be mixed with superphosphate: copper fertilizers should not be mixed with potassium dihydrogen phosphate solution. China Agricultural Network Editor
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