The growth of fruit trees requires not only a large number of elements, but also trace elements. Calcium, as the medium and trace element with the largest demand for nitrogen, phosphorus and potassium, has important significance in the growth of fruit trees. Even in some calcium-rich soils, physiological calcium deficiency occurs in fruit trees and vegetables that require high levels of calcium. Such as apple bitter disease or water heart disease; peach tree calcium deficiency fruit top rot and a large number of fruit drop caused by calcium deficiency; Chinese cabbage dry heart, tomato umbilical rot.
There is a lot of calcium in the soil itself, why is there calcium deficiency?
natural factors
Although the absorption of calcium by the root system is always carried out, the absorption of calcium itself is a slow process, and the calcium ions in the soil can only be absorbed by the young apex.
Calcium ions are transported through transpiration in plants, so in the rainy season, or in the dry season, calcium ions are greatly affected by the effects of transpiration.
Calcium does not transport down the fruit trees, so fruit trees or seeds are prone to calcium deficiency.
Management factor
High-yield planting, crops absorb a large amount of nitrogen, phosphorus, potassium, in order to maintain the balance of elements, the demand for calcium will also increase.
If the new shoots of the fruit tree are too prosperous, they will compete with the fruit for calcium absorption, resulting in calcium deficiency.
In the process of planting, under the premise of good management, fruit trees are sprayed with calcium once before bagging, and once with calcium during the fruit-expanding period, which can increase the toughness of the skin and prevent fruit from cracking. Increase the weight of the single fruit and increase the yield. Spraying calcium once every 10 days before picking can increase the storability of the fruit.
Why should the fruit tree be sprayed with calcium before bagging?
1. Calcium does not move downward in fruit trees, so fruit trees and seeds are prone to calcium deficiency. After the bagged fruit, the transpiration is further weakened, and the fruit is more likely to be deficient in calcium.
2. The root absorption calcium is transported slowly through transpiration. The foliar spray is more directly absorbed by the spray. After the bag is applied, the fruit surface cannot be sprayed. Therefore, it should be sprayed before bagging.
So how should fruit trees choose calcium fertilizer?
Calcium is a medium-sized element, supplements calcium, promotes white root hairy roots, improves fertilizer absorption capacity; supplements calcium, increases fruit firmness, increases single fruit weight, prolongs preservation period; supplements calcium, increases leaf thickness, strengthens tree potential, and improves tree resistance Disease ability; calcium supplementation, reduce the physiological diseases caused by calcium deficiency... In short, calcium is very important for crops.
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(Source: Good Agricultural Resources)
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