There may be several reasons why cabbage seedlings are rotten:
1.Soft rot: Soft rot is a common disease that is usually caused by insect infestation or carrying germs to cabbage. When the temperature is suitable, the germs multiply rapidly and slowly spread to the outer skin, resulting in the occurrence of rotten plants.
2.Calcium deficiency heartburn: Cabbage heartburn is a physiological disease mainly caused by calcium deficiency. When the root system is unable to transport enough calcium, it can cause the leaves in the heart to deteriorate and become unusable. Heartburn can also occur when manganese deficiency is excessive. During heartburn, the edge of the leaf center is dry and shrinks inward, the growth of cabbage is inhibited, and the balling is no different from normal cabbage, but the inside is in a water-stained state, and the leaves are erosive and rotten, and there is a rancid taste.
3.Soil salinization: When the soil salinity is too high, it will affect the water and fertilizer absorption ability of cabbage roots, resulting in poor plant growth, and then causing the phenomenon of heart rot.
4.Too much nitrogen fertilizer: Too much nitrogen fertilizer will cause cabbage plants to grow too fast and increase the cell volume, while the cell wall is not formed in time, resulting in cell rupture, which in turn will cause heart rot.
5.Environmental factors: Adverse environmental conditions such as high temperature and high humidity can also lead to cabbage seedling rotten. In this case, germs and insect pests are easy to breed, which further accelerates the rot of cabbage seedlings.
To prevent cabbage seedlings from rotting, the following measures can be taken:
1.Choose varieties that are highly resistant to disease.
2.Strengthen cultivation management to keep the soil moist and avoid drought or over-humidity.
3.Reasonable fertilization, avoid excessive nitrogen fertilizer, increase the amount of phosphate fertilizer, potassium fertilizer and trace elements.
4.Timely control of pests and diseases, reduce plant wounds, and avoid bacterial infection.
5.Improve soil structure and reduce soil salinity.