What should I do if garlic leaves turn yellow?

1. Loosen the soil

Reason: If the soil for growing garlic is too compacted, it will be difficult for air permeability and drainage, and will hinder the breathing of the roots. In addition, soil compaction will prevent water and fertilizer from penetrating into the soil well, and the roots will not be able to absorb nutrients in time. If nutrients are not supplied in time, its leaves will begin to turn yellow slowly.

Measures: It is necessary to turn over and loosen the soil in time to increase the softness, air permeability and drainage of the soil so that water and nutrients can infiltrate in time and be absorbed by the roots.

2.Apply appropriate amount of topdressing

Reason: If garlic lacks nitrogen fertilizer during growth, the old leaves will turn yellow. If there is a lack of potassium fertilizer, its branches and leaves will become dry. If there is a lack of calcium, some necrotic spots will appear on the leaves, the heart leaves will turn yellow, and in severe cases the leaf tips will die.

Measures: Observe the growth of garlic and apply fertilizer according to the actual situation, but not too much, especially nitrogen fertilizer.

3. Alleviate fertilizer damage

Reason: When too much fertilizer is applied, it is easy to burn the roots of garlic, affecting its ability to absorb nutrients and causing the outer leaves to turn yellow.

Measures: Water the soil twice with heavy water during consecutive sunny days to absorb the heat released by the fertilizer in the soil and dilute its fertility. In addition, you can also spray foliar fertilizer to supplement the nutrient deficiency caused by root burns in garlic. You can also apply some functional fertilizers that promote rooting to help the root system sprout new roots quickly.

4. Prevent and control pests and diseases

Cause: Diseases such as leaf blight, garlic gray mold and garlic maggots can also cause garlic leaves to turn yellow.

Measures: You can spray carbendazim to prevent and control leaf blight. Garlic gray mold can be treated with drugs such as cypermethrin and carbendazim. For garlic maggots, prevention and control should be more timely. You can use 600 times solution of 90% dichlorodiphenyltrichloroethane for root irrigation treatment, and water once every ten to fifteen days.