Calcium is one of the essential nutrients for the growth and development of crops. After investigation, it has been found that many orchards have neglected the application of calcium and other trace elements in the production of fruit trees for many years because they only pay attention to the input of chemical fertilizers (nitrogen, phosphorus, and potassium). In addition, due to the poor ability of the fruit tree root system to absorb calcium, due to different raw materials, the leaves penetrate poorly after spraying, and the absorption is slow, resulting in poor mobility of calcium in the tree and other characteristics, making the calcium deficiency of fruit trees more and more prominent.

Calcium deficiency in crops can cause a variety of physiological diseases and physiological obstacles, affecting the growth and development of crops, flowering and fruit setting, resulting in poor fruit quality. Therefore, calcium supplementation of fruit trees must attract attention.

Fruit trees absorb calcium three times a year, the first time is about 20 to 30 days after flowering, and about 30% of calcium can accumulate during this period. It is recommended that calcium and boron be supplemented; the second time during the fruit expansion period, During this period, it can absorb about 50% of the total calcium; the third time is about 20 to 30 days before fruit picking. The calcium absorbed during this period can be used for the calcium needs of fruit trees next spring.

In the orchard, organic fertilizers are added to fertilize the soil to promote the absorption and utilization of calcium by fruit trees. At the same time, it advocates targeted extra-root calcium supplementation during the three peak calcium absorption periods to improve calcium concentration and application quality.

There are two characteristics to choose a good calcium fertilizer: one is that the concentration of calcium ions is high, which requires more than 10%; the other is that the activity of calcium is high, and the absorption rate is high, which requires more than 80%. In general, calcium chloride and calcium nitrate have the characteristics of high calcium content, but low absorption efficiency; calcium amino acid has the characteristics of high absorption efficiency, but the calcium ion content is low, about 5%.

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