The calcium absorption of grape roots is mainly concentrated in the flowering period to the color change period. Before the leaves are deciduous, the calcium content in the leaves increases, and 54% of the calcium in the plants is lost with the leaves. How to give calcium to the grape, reminding the majority of fruit farmers to start from four aspects:
1. Add organic fertilizer. It is better to use organic fertilizer in autumn, and it should be sooner rather than later. The amount of fertilizer applied should be determined according to the yield per plant of fruit trees. It is more suitable to apply 100-150 kg of organic fertilizer per 100 kg of grapes.
2. Soil calcium supplementation. Combined with the organic fertilizer of autumn application, each plant has 1 to 2 kg of calcium nitrate. Control the amount of potassium fertilizer applied, adjust the potassium/calcium ratio of the vine, so that the potassium/calcium ratio is 1.2 to 1.5/1.
In addition, the right amount of boron can promote the transport of carbohydrates to the roots, promote new roots, and facilitate the absorption of calcium. In combination with the application of organic fertilizer, a small amount of boron fertilizer, such as borax 0.1 to 0.15 kg, is added. The application of medium trace elements such as calcium magnesium boron zinc iron.
3. Foliar spray of calcium. For orchards with severe calcium deficiency, the fruit growers can spray calcium fertilizer, such as calcium nitrate, in the pre-growth stage, the young fruit expansion period and the first month before harvest, and the concentration is preferably less than 0.5%. Calcium is poorly mobile in the grape, so a small amount of spray
The effect is better. Calcium preparations with better effect include quick-acting calcium, amino acid calcium, calcium magnesium and the like.
4. Amino acid calcium solution soaked fruit. Before harvesting, the fruit is diluted with 300-400 times amino acid calcium solution to prevent calcium deficiency during storage.
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