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Second, molybdenum vegetables are poorly grown and dwarfed when they are deficient in molybdenum, and the leaves lose their green and wither to death. The commonly used molybdenum fertilizers are ammonium molybdate and sodium molybdate. Mo fertilizer is generally used for seed dressing, soaking and root spraying. The average amount of 1kg seed fertilizer used for seed dressing is 2~6g; 0.05%~0.1% molybdenum fertilizer solution is used for seed soaking; the top dressing fertilizer concentration is 0.01%~0.1%.
3. Manganese deficiency Manganese deficiency is mainly characterized by the appearance of small brown spots between the leaves and veins of young leaves, and the plants stop growing. Manganese fertilizer commonly used in production is manganese sulfate. For basal fertilizer, apply 3-5kg per 667m~; use 5~7g for seeds of average lkg for seed dressing; 0.05~0.1% for seed soaking; 0.05%~0 for top dressing .1%.
Fourth, zinc deficiency vegetables, when the lack of zinc, resulting in petiole after the roll, leaf chlorosis, leaf clusters, internode shortening, plant dwarf, so that significantly reduced yield. Currently in production, the most widely used zinc fertilizer is zinc sulfate. Zinc Fertilizer as Basal Fertilizer with Zinc Sulfate 1. O-1.5kg, but must pay attention to zinc fertilizer can not be mixed with phosphate fertilizer; soaking with 0.02%-0.04% zinc sulfate solution; seed dressing average lkg seed fertilizer amount is 2-4g; leaf spray Zinc sulfate solution was applied at a concentration of 0.01%-0.05%.
5. Copper deficiency Copper deficiency usually causes dwarfing of plants, yellowing of seedlings, and necrosis of the apical meristem. The copper fertilizer commonly used in production is copper sulfate. Copper sulphate is used as basal fertilizer with lkg every 667m2. When applied, it is mixed with the soil uniformly; foliar spray is applied with 0.02%-0.04% solution. To avoid phytotoxicity to the leaves, a small amount of hydrated lime can be added to the solution.
Sixth, iron deficiency caused by iron deficiency caused by vegetable veins chlorosis, the development of the whole leaf yellow or white. Ferrous sulfate is commonly used for iron-containing fertilizers. Ferrous sulphate can be used as base fertilizer after being mixed with organic fertilizer. The ratio of the two is 1:20; 5% ~ l% ferrous sulfate solution.
Precautions
(1) The foliar spray of trace element fertilizer should be sprayed once at the seedling stage and transferred from vegetative growth to reproductive growth, and the water consumption per time is 50-60kg/667m2. (2) Foliar spray fertilizer can be combined with spraying, and adding 0.05% urea at the same time can significantly increase fertilizer efficiency. (3) The soaking time of trace element fertilizer is generally 6-12 hours. (4) As a base fertilizer, trace fertilizer has a long after-effect time, which can be applied once every 2-4 years, and must be applied evenly to avoid excessive local concentration and poisoning. Can be mixed with a large number of elements or organic fertilizers.
The application of six kinds of vegetable fertilizers
1. The boron deficiency of boron fertilizers and vegetables is obviously manifested in the thickening of the petioles of the plant stems, becoming brittle and easily split, poor root development, dark green leaves, light and deformed new leaves, impaired or necrotic growth points, abnormal flower growth, and fertility. Extended period. Boron fertilizers commonly used in production include borax and boric acid. Boron fertilizer can be used as base fertilizer, top dressing and seed fertilizer. When borbic soil is used as basal fertilizer, borax or boric acid 0.5-1.5kg can be applied per 667m2; 0.01%-0.1% when seed soaking, and 1kg seed fertilizer when dressing 0.4 ~ 1.0kg; foliar spray 0.1% an O. 2% borax or 0.05%-0.1% boric acid solution.