The most serious hazard of repeated cropping of peanuts is severe yield reduction, and the longer the continuous cropping period, the more serious the yield reduction. Under normal circumstances, production can be reduced by 20% to 30%. The main manifestations are that the repeated cropping of peanuts grows slowly, the plants are thin, the results are few and small, the quality of the fruit pulp is poor, and the pests and diseases are serious. The most obvious harm to the repeated cropping of peanuts for three consecutive years is that the yield is lower year by year, and the pests and diseases of peanuts are more obvious. The incidence of peanut leaf spot diseases (black spot, brown spot, net spot, scorch spot) is becoming more and more common.

In the case of repeated cropping, the nitrogen fixation capacity is reduced and the absorption of nitrogen in the soil is reduced. However, the absorption of other medium and trace elements will not be reduced accordingly, resulting in an imbalance of nutritional proportions, which is prone to occur during the growth of peanuts. Deficiency disease, thereby affecting the normal growth of peanuts. Continuous cropping, as the name suggests, is the continuous planting of one type of crop in a piece of land. We call it repeat cropping here. Among the crops and vegetables grown, there is no crop with higher yield and better quality with more continuous cropping. On the contrary, the quality and quantity of crops will decrease as they are continuously cropped.

Corn and sweet potato are two representative diseases and insect pests in crops. They develop quickly and cause great harm. Viruses and bacteria remain after planting in the first year, and continue to multiply and reproduce in the second year, becoming more serious every year. After three years of continuous cropping, crop yields will be reduced by more than half. The same is true for growing vegetables. The nutrients needed by vegetables are all unique, and trace elements are very important. You cannot replant them continuously. I will repeat that sentence, there is no luck in planting crops, and they need to be planted twice every three years.

This idea takes the soil in vegetable greenhouses as an example. Vegetable greenhouses in our village can be planted about twice a year, such as cucumbers and tomatoes. Such continuous planting will directly cause soil salinity. , because the same crop remains consistent for a long time in terms of irrigation and fertilization. What is continuous cropping: Continuous cropping refers to the planting of the same vegetable or the same category of crops in consecutive years, which can be called two types of continuous cropping. Especially in the case of continuous cropping for more than three years, the harm is more obvious.