Yellow leaves and dried tips are the causes of those
1, the soil acidification leek hi neutral soil, a long-term large-scale application of manure, cake fertilizer, manure and ammonium sulfate, calcium superphosphate and other acidic fertilizers, will cause the acidification of the soil, so that the leek leaves grow slowly, slender, outer leaves yellow.
2. Injurious gas inflicted a large amount of ammonium bicarbonate or sprinkled urea on the ground after the shed is applied before the shed, and ammonium sulfate is applied to the alkaline soil, which is easy to produce ammonia gas and cause ammonia harm. In addition, excessive accumulation of nitrous acid will cause nitrite gas damage.
3, high temperature, cold wind damage when the room temperature is longer than 35 °C, and the air is relatively dry, easy to cause leaves burning. Sometimes after a sunny day after a cloudy day, or a sudden intrusion of cold air after a high temperature, will make the amaranth leaf tip and even the entire leaf white or yellow withered.
4. Deficiency of trace elements; Deficiency of zinc heart; Yellowing of heart; Deficiency of calcium; Yellowing of heart and leaves, some leaves tip dead; Yellow leaves of magnesium deficiency withered; Yellow leaves of boron-deficient center leaves, excessive boron leaves dead; Manganese excess center The leaves were slightly yellowed and the outer leaves yellowed to death.
5, the appropriate temperature for the growth of leeks is 5 ~ 35 °C, when the greenhouse temperature is higher than 35 °C, long duration, resulting in the tip or the whole leaf white, yellow.
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