The effects of antagonistic ions in soil The ammonium ions, potassium ions, sodium ions, and magnesium ions in the soil solution can produce an antagonistic effect with calcium ions and inhibit the absorption and utilization of calcium ions by the fruit trees and show a calcium deficiency phenomenon.
The absorption capacity of calcium in roots of fruit trees is poor. Calcium can only be absorbed in the area where the Kjeldahl band is formed in the apical area. The absorption of various root hairs with strong nutrient capacity is the main area for forming the Kjeldahl band. Since the root hair zone is located at the back of the root zone, the root tip of the root tip immediately before the root hair zone (elongation zone, growth point, root cap) is excessively aged due to elongation and gradually aging root hair zone Loss the ability to absorb calcium ions.
Mobility of calcium in plants is poor. Calcium transport in plants is mainly through the xylem conduit, relying on the dynamics of the transpiration liquid, transported to the vigorously growing organs, and the mobility of calcium in the plant is poor, basically no longer carried out Because the transpiration intensity is higher and the growth time is longer, the amount of calcium transported is increased. The transpiration intensity of the fruit is much smaller than that of the leaves. In addition, the mobility of calcium is poor, and the calcium in the leaves is difficult to transfer to the fruit, so the fruit often causes severe calcium deficiency. The bagged fruit is heavier than the non-bagged fruit, because the transpiration strength of the bagged fruit is smaller than that of the unbagged fruit because of the role of the paper bag.
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