Bitter bitter disease is a major physiological disease in apple production. The occurrence of this disease is mostly concentrated on the top part of the fruit. The reason is that calcium is mainly absorbed by roots and transported to various parts of the ground, and due to physiological factors, calcium is absorbed and transported. The process is more difficult, the fruit is mainly through the handle to transport calcium, the original absorption capacity is poor, the amount of absorption is small, plus the fruit top is relatively far from the handle, the relative concentration of fruit top calcium is less, so the top of the fruit is more easily missing calcium.
Therefore, in production, to reduce the occurrence of the disease, first, there is sufficient available calcium in the soil, and 25 kg/mu of calcium nitrate or 100-150 kg of quick lime is added through early spring soil to increase the amount of calcium; , Straw returning soil, etc. to improve soil organic matter and increase the effectiveness of calcium. The second is chasing the calcium out of the roots. After 3-5 weeks after flowering, the tree absorbs the peak of calcium absorption and sprays effective calcium fertilizer, such as 0.3% high-quality Norwegian calcium nitrate and high-concentration calcium amino acid. It also prevents the soil from drying out and dampening, affecting the normal absorption of calcium and controlling the size of the year.
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