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Boron deficiency in vegetables is obvious in the stems and stems of the plants becoming thicker, brittle and easy to split, the roots are poorly developed, the leaves are dark green, the new leaves are light and deformed, the growth points are damaged or necrotic, the flower development is abnormal, and the growth period is prolonged. Boron fertilizers commonly used in production include borax and boric acid. Boron fertilizer can be used as base fertilizer, top dressing and seed fertilizer application. When used as a base fertilizer on boron-deficient soil, 0.5-1.5kg of borax or boric acid can be applied per 667m2; the concentration is 0.01%-0.1% when soaking seeds, and the average amount of seeds used for seed dressing is 1kg. 0.4~1.0kg; foliar spray should be 0.1%-O. 2% borax or 0.05%-0.1% boric acid solution.
Second, molybdenum fertilizer
When vegetables are deficient in molybdenum, they grow poorly, are short, and the leaves are chlorotic and wither and die. Commonly used molybdenum fertilizers are ammonium molybdate and sodium molybdate. Molybdenum fertilizer is generally used for seed dressing, soaking and root spraying. When seed dressing, the average amount of seeds used for 1kg seeds is 2~6g; for soaking seeds, 0.05%-0.1% molybdenum fertilizer solution; the concentration of top dressing is 0.01%-0.1%.
Third, manganese fertilizer
Manganese deficiency in vegetables is mainly manifested by the appearance of fine brown spots in the chlorotic yellow leaves of the young leaves, and the plants stop growing. The manganese fertilizer commonly used in production is manganese sulfate. For the base fertilizer, apply 3-5kg per 667m~; the average lkg seed for seed dressing is 5~7g; the soaking concentration is 0.05%-0.1%; when used as the root dressing, the concentration is 0.05%-0 .1%.
Fourth, zinc fertilizer
When vegetables are deficient in zinc, the petiole is rolled back, the leaves are chlorotic, the leaves are small clusters, the internodes are shortened, and the plants are short, which leads to a significant decrease in yield. Currently, the most widely used zinc fertilizer in production is zinc sulfate. Zinc fertilizer as base fertilizer with zinc sulfate per acre. O-1.5kg, but it must be noted that zinc fertilizer can not be mixed with phosphate fertilizer; 0.02%-0.04% zinc sulphate solution is used for soaking seeds; average lkg seed fertilizer amount is 2-4g when seed dressing; A zinc sulfate solution having a concentration of 0.01% to 0.05% is applied.
Five, copper fertilizer
Copper deficiency usually causes plant dwarfing, yellowing of the seedlings, and necrosis of the apical meristem. The copper fertilizer commonly used in production is copper sulfate. Copper sulphate as base fertilizer is used in lkg per 667m2, and evenly mixed with soil when applied; foliar spray application of 0.02%-0.04% solution, in order to avoid phytotoxicity to the leaves, a small amount of slaked lime may be added to the solution.
Six, iron fertilizer
Iron deficiency causes chlorosis between the young leaves of the vegetables, and the whole leaves are yellowish or whitish. Iron-containing fertilizers are commonly used for ferrous sulfate. 2. Ferrous sulfate can be mixed with organic fertilizer for base fertilizer. The ratio of the two is 1:20; foliar spray application O. 5% to 1% ferrous sulfate solution.
Precautions
(1) Foliar application of trace element fertilizer should be sprayed once at the seedling stage and from vegetative growth to reproductive growth, each time using 50-60kg/667m2. (2) Foliar spray fertilizer can be combined with spraying, and adding 0.05% urea at the same time can significantly improve the fertilizer efficiency. (3) The soaking time of trace element fertilizer is generally 6-12h. (4) The application time of micro-fertilizer as base fertilizer is longer, and it can be applied once every 2-4 years, and it must be evenly applied when it is applied to avoid poisoning caused by excessive local concentration. It can be applied in combination with a large amount of elements or organic fertilizers.
Techniques for applying six kinds of micro-fertilizers for vegetables
First, boron fertilizer
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