Symptoms of potassium deficiency in apples: new shoots grow slowly, the edges of the leaves are scorched, often accompanied by purple spots. In severe cases, the entire blade is scorched, and this coke is first started from the middle or lower part of the new shoot, and then spreads in both the top and the base. Potassium deficiency in apples will seriously affect the growth and development of fruit trees.
The growth of pears with potassium deficiency is weakened, the internodes are shortened, and the edges of the leaves are dark brown or black. After that, they gradually lose focus, lose photosynthesis ability, and the fruit is small, mature or not mature.
Symptoms of potassium deficiency in peach: The new shoots grow slowly, the branches are thin and short, the leaves of the new branches become wrinkled, appear curved, the leaves are reddish, the edges are cracked, the photosynthetic capacity is greatly reduced, the fruit becomes smaller, the quality is reduced, and the yield is decreased.
Precaution:
(1) Change the habit of making a large amount of potassium crops such as sweet potatoes, peanuts, and yellow smoke for a long period of time. Increase the application of farmyard manure, such as pig manure, cow dung, grass ash, straw fertilizer, etc., to meet the long-term demand for potassium growth and development.
(2) Spray 0.3%-0.5% potassium dihydrogen phosphate and urea mixed solution 2-3 times in time to replenish nutrients as soon as possible to meet the urgent needs of fruit trees for potassium.
(3) Timely application of quick-acting fertilizers such as potassium sulfate, potassium chloride and potassium dihydrogen phosphate, combined with multi-purpose long-acting compound fertilizers such as special fertilizer for fruit trees to ensure the robust growth of plants.
(4) To remove some fruits, reduce nutrient consumption, and promote vegetative growth.
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