There are many reasons for yellowing of corn leaves, some of which can be alleviated, but some of which can lead to plant death if measures are not taken in time, the most common of the following 11 reasons.
1. Poor quality of land preparation: Poor quality of land preparation, especially straw return plots, leads to soil suspension, affects the absorption of water and nutrients by seedlings, and causes yellowing of seedling leaves.
2, phosphorus deficiency: when sowing the bottom fertilizer is lacking phosphorus, when the seedlings in the soil leaves can not absorb the lack of elements will appear leaf yellowing, of course, the bottom fertilizer nitrogen deficiency will also lead to leaf yellowing.
3, sowing too deep: sowing too deep, the emergence time is relatively prolonged, the consumption of nutrients stored in the grain is more, and the leaves turn yellow into yellow seedlings when the seedlings emerge.
4. Planting density is too large: due to excessive planting density, the leaves shade each other after emergence, affecting poor light transmittance and low photosynthetic efficiency, resulting in yellowing of leaves. Shading each other from the basal leaves in the later stages of growth can also cause yellowing of the leaves.
5, low temperature: after the emergence of low temperature will cause the seedling leaves to yellow, when the temperature rises, the leaf color will gradually return to green.
6. Herbicide drug harm: the concentration of herbicide is too large or repeated spraying, resulting in yellowing of leaves. In addition, grass shortage is also a cause of yellow.
7, underground insect pests: underground pests bite the root system of seedlings, affecting the absorption of roots will also cause young leaves to yellow.
8, aboveground insect pest hazards: red spiders, aphids and other hazards in the early stage, will also lead to yellowing of leaves.
9. Drought and little rain: when there is little rain in drought, the respiration of the root system and the transportation of nutrients are blocked, and the supply of nutrients is difficult, resulting in yellowing of leaves.
10. High humidity: poor drainage of water or low-lying plots in the field, poor soil permeability, and difficulty breathing in the root system, resulting in yellowing of leaves.
11, defertilization: in the late stage of growth, soil defertilization will also lead to yellowing of leaves, such as failure to replenish fertilizer in time, which will lead to premature aging when severe.