The absorption of calcium in grape roots is mainly concentrated from the flowering stage to the coloring stage. Before the grape leaves fall, the calcium content in the leaves increases, and 54% of the plants lose calcium with the leaves. How to replenish calcium and remind farmers to start from four aspects:
1. Add organic fertilizer. It is better to use organic fertilizer in autumn as soon as possible. The amount of fertilizer should be determined according to the yield of individual trees. It is more appropriate to produce 100-150 kg of organic fertilizer per 100 kg of grapes.
2. Soil calcium. In combination with organic fertilizer applied in autumn, 1 to 2 kg of calcium nitrate is applied to each vine. It is more appropriate to control the amount of potash fertilizer and adjust the ratio of potassium to calcium in the grapevine so that the ratio of potassium to calcium is 1.2 to 1.5/1.
In addition, the appropriate amount of boron can promote the transport of carbohydrates to the root system, promote new roots, and facilitate the absorption of calcium. Combined application of organic fertilizer, add a small amount of boron fertilizer, such as borax 0.1 ~ 0.15 kg. Trace elements such as calcium, magnesium, boron, zinc and iron are applied.
3. Spray calcium on leaves. For the orchard with severe calcium deficiency, the fruit grower can spray calcium fertilizer in the early stage of grape growth, young fruit expansion and 1 month before harvest, such as calcium nitrate, and the concentration should be less than 0.5%. Calcium is poorly mobile in grapes, so small amounts of spray
The effect is good. The calcium preparations with better effects are available calcium, amino acid calcium, calcium magnesium, and the like.
4. Amino acid calcium solution soaked fruit. Before harvesting into the warehouse, dipping with 300 to 400 times of amino acid calcium solution can prevent calcium deficiency during storage.
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