Uncle Liu planted 3 mu of leeks this year, and watched the shed leeks have dried yellow leaves. Liu Da thought that the leeks were dry, and panicked and watered the leeks, resulting in a large area of ​​leeks in the whole greenhouse. It happened that the yellow leaves were dry, which made Uncle Liu regret that he had watered the leeks blindly without understanding it. So what is the cause of the leek dry tip? How do we prevent the leek stem?

Protected leeks are prone to fading, yellowing, or dry leaves of the heart or outer leaves. If long-term application of ammonium sulfate and superphosphate will acidify the soil, the leaves of the leek grow slowly, slender, and the outer leaves are yellow.

Excessive application of ammonium bicarbonate before the film is applied, or urea is applied on the ground after the film is applied, or ammonium sulfate is applied to the alkaline soil, or the unfertilized organic fertilizer is applied, so that the ammonia in the shed is excessively caused to wither and brown.

Soil acidification also causes excessive accumulation of nitrous acid, which causes the tip of the leaf to become white and die. High temperature, sudden cloudy weather, excessive wind or sudden intrusion of cold air will make the tip or whole leaf white or yellow. Therefore, it is necessary to apply more decomposed base fertilizer and multi-grain fertilizer, and apply ammonium sulfate or ammonium hydrogencarbonate with water, and the shed should master the air release technology.

Leaf yellowing or yellow strips (semi-green and yellow)

Due to the imbalance of plant nutrients, such as harvesting the “greeting knife”, harvesting too short “sickle”, excessively depleting plant nutrients, inhibiting root development and reducing absorption, affecting shoot growth and photosynthesis Product accumulation. Or water supply imbalance, such as insufficient frozen water, winter and spring drought, etc., resulting in reduced chlorophyll, yellow leaves. Therefore, it should be harvested at the right time, properly reserved, does not affect the growth of the next amaranth, and scientific irrigation to prevent drought.

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