Sesame should not be planted continuously.

Sesame is a good oil crop. Sesame oil is rich in nutrition and has a certain function of medical and health care. Therefore, in recent years, the demand for sesame has increased, and the area of planting sesame has been expanded. There is a problem that must be paid special attention to in planting sesame seeds, that is, one cannot continue to stubble. In other words, a crop of sesame seeds was planted last year and cannot be planted the next year. Otherwise, high output and high benefit will not be achieved. Why can't sesame seeds be planted continuously? There are two main reasons: one of the reasons is that continuous cropping of sesame will aggravate the disease. In the process of sesame production, many pathogenic bacteria, such as stem wilt, bacterial wilt, blight and so on, remain in the soil after sesame harvest. If sesame seeds are planted in the second year, these pathogens will become the source of infection of sesame seeds. The longer the continuous cropping, the more pathogens in the soil, and the disease of sesame will become more and more serious. Infected by the disease, sesame plants will appear stunted, single plant dwarf, falling flowers and few capsules and other symptoms, and even a large area of wilting and death will occur. The second reason is that sesame is a crop that needs more fertilizer, and continuous cropping will lead to nutrient imbalance. According to the experiment, for every 50 kg of sesame produced, it is necessary to absorb nitrogen 4.50 kg from the soil, 1.25 kg of phosphorus pentoxide, 5.50 kg of potassium oxide, and the ratio of the three elements is about 4.40. Thus it can be seen that sesame needs more nitrogen and potassium and less phosphorus. If continuous cropping, it will break the balance of soil fertility, resulting in the lack of nitrogen and potassium, and it is difficult to increase the yield of sesame. Therefore, continuous cropping of sesame seeds is unscientific and should be avoided.