The content of zinc in the soil is small, and generally cannot meet the needs of crop growth and development, and must be supplemented by fertilization. Especially in the northern part of China, there are more alkaline soils. The higher the pH value of this type of soil, the lower the effectiveness of zinc, and the need for zinc supplementation.
Of course, although vegetable production needs zinc supplementation, it does not mean that the more zinc fertilizer is used, the better. When farmers add zinc fertilizer to vegetables, they must remember “three nosâ€.
Do not apply too much. The reason why zinc fertilizer is micro-fertilizer is that crops need less of it, and the application rate is too toxic to crops. Some vegetable farmers apply zinc sulphate 3 kg at the time of bottom fertilizer, and later add zinc fertilizer frequently in the later season. Zinc sulfate reached 250 grams). Lead to crop growth stagnation, small and thin leaves, affecting normal photosynthesis.
Do not apply continuously in the base fertilizer. Zinc fertilizer is generally used for a long period of time, and it can last for 1-2 years. In addition to severe zinc-deficient soils, it is recommended that zinc fertilizer be applied once a year. However, in actual production, the vegetable farmers apply zinc fertilizer to the bottom of each vegetable before it is planted, resulting in the application of zinc fertilizer twice in one year, so that the amount of residual zinc in the soil is too large, and the absorption of other elements by the soil is inhibited.
Do not mix with alkaline fertilizers or alkaline pesticides. When zinc is mixed with alkaline fertilizer, it will react and reduce fertilizer efficiency. Similarly, zinc is mixed with alkaline pesticides, and the effectiveness of zinc and the efficacy of pesticides are also reduced. Moreover, if the zinc fertilizer is mixed with the phosphate fertilizer, it is easy to form a zinc phosphate precipitate, which not only reduces the effectiveness of the zinc, but also reduces the fertilizer efficiency of the phosphorus, so the two should not be used at the same time.
Therefore, when zinc fertilizer is used as the base fertilizer, whether it is a large number of vegetables or more than one year of cultivation, it can be applied once at the end of the year. According to the degree of zinc deficiency in the soil, 0.5-2 kg of zinc sulfate per acre is applied as the base fertilizer. For topdressing, use 0.75-1 kg of zinc sulfate per acre to mix with appropriate amount of fine soil; for foliar application, apply 90-180 g of zinc sulfate per acre to 60 kg of water on a sunny day. When used, it is best to use it alone to avoid reacting with other chemical fertilizers and affecting the absorption of zinc by crops.
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