Shed leeks

First, the harm of soil acidification

The growth and development of leeks are suitable for neutral soils. When a large amount of manure, cake fertilizer, chemical acidity (such as superphosphate) or physiological acid (such as ammonium sulfate) fertilizer is applied to the soil, it will cause acidification of the soil and cause acid hazards. The main symptoms are the slow and delicate leaf growth and the yellow outer leaves. The control method is to apply compost as base fertilizer and use lime to adjust soil pH. However, it is not possible to use lime in the greenhouse to prevent ammonia from evaporating and causing gas damage.

Second, harmful gas hazards

The use of large amounts of ammonium carbonate in front of the shed and spraying of urea and cottonseed cake on the ground after the watering of the surface of the fertilizer lumps, and the spreading of ammonium sulphate on the lime-rich soil may volatilize after the shed. Ammonia evolved and accumulated in the room, causing ammonia harm. If the soil has been seriously acidified, it may be due to the accumulation of nitric acid gas. The difference in the symptoms of the two gas hazards is that the ammonia damage is a reduction reaction, and the yellowing of the tip is gradually browning; the nitrous acid gas is an oxidation reaction, and the tip of the leaf is white and dead. The prevention method is:

1. Do not apply fertilizers that produce ammonia gas directly or after decomposing. Do not apply too much fertilizer.

2. Ammonia hazard was found on the basis of ventilation and ventilation. Grasp the 1% vinegar solution on the leaf surface to reduce the hazard.

3, found that nitrite gas hazards also need ventilation, and then pay close attention to spray 800 ~ 1000 times baking soda solution.

Third, the high temperature and cold wind attack caused by the leaves

The optimum temperature for the growth of leeks is 5°C to 30°C. Long-term exposure to high temperatures at room temperature and dry air can cause the leaves to dry. Even when the chilly wind suddenly intrudes after a sudden chill, or after a high temperature, it may cause yellow tips.

IV. Bacterial Leaf Blight Caused by Physiological Disorders (Leaf rot)

From the tips of the outer leaves, it becomes dark brown, then the leaves gradually wither and the central leaves turn white. This is usually caused by high temperature caused by leaf burn disease. High temperature, high humidity, lack of fertilizer, or the leeks in the greenhouse harvested before decaling may easily appear as symptoms of withering after the tip yellowing, commonly known as leaf blight.

Fifth, leaf dryness caused by lack or excess of trace elements

In the absence of calcium, the central leaves become yellow and some of the leaves tip dead; in the absence of magnesium, the outer leaves yellow and die; in the absence of boron, the center leaves yellow and physiologically blocked; if boron is excessive, it generally begins to die from the tips of the leaves. Excessive use of manganese-containing pesticides caused excess manganese, the leaves were slightly yellowed, and the outer leaves died. The use of trace elements added outside the root can partially or completely eliminate the above symptoms.

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