Cabbage-burning heart attack usually occurs in the lotus sitting stage, and the symptoms are obvious after the ball is set, and it reaches the most severe degree during storage. After the onset, the top edge of the Chinese cabbage leaf ball rolled outward, and the leaf edge gradually dried and yellowed. As the lesion spread, the upper part of the leaf also gradually dried and yellowed, showing a dry paper shape. The diseased leaves were distinguished from the robust leaves. The diseased leaves were mainly concentrated in the middle of the leaf ball, and most of the severely diseased leaves yellowed, which seriously affected the commercial quality of Chinese cabbage. Cabbage heartburn is a physiological disease, which occurs frequently in vegetable fields where heavy crops are planted, drought, and excessive application of ammonium sulfate fertilizer. Because of repeated cropping, drought, and a large amount of ammonium sulfate fertilizer application, the water-soluble calcium in the soil is easily lacked, which causes the content of manganese in the soil to decrease, and eventually causes heartburn. After the occurrence of heartburn in cabbage, the treatment effect is not very good, so prevention should be given priority. When selecting plots, choose plots that have not been planted with cruciferous vegetables within 2 to 3 years to avoid heavy cropping. Fertilization should be based on base fertilizers, supplemented by topdressing, supplemented with organic fertilizers, appropriate amounts of chemical fertilizers, and avoid excessive nitrogen fertilizer application, especially ammonium sulfate nitrogenous fertilizers should be reduced, and the amount of phosphorus and potassium fertilizers should be appropriately increased to promote the Balanced absorption of various nutrients to improve disease prevention and disease resistance. To ensure water supply during growth, especially in the seedling and lotus periods, to keep the soil moist. Foliar spraying was carried out with 0.7% manganese sulfate solution at the seedling stage and lotus sitting stage of 50 liters per acre for a total of 2 to 3 times to meet the manganese needs of cabbage. Disclaimer: Some articles on this website are transferred from the Internet. If third party legal rights are involved, please inform this website to deal with them. phone Tetanus Vaccine,Hepatitis B Vaccine For Adults,Tetanus Booster,Td Vaccine FOSHAN PHARMA CO., LTD. , https://www.fspharmaapi.com