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Why can't soybeans be planted in continuous cropping?

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Soybeans are commonly known as yellow beans. Farmers have a traditional habit of planting soybeans this year and continuing to plant them next year, which results in stunted growth, shortness, yellowing leaves, susceptibility to pests and diseases, fewer pods and small seeds, and significantly reduced yield in continuously cropped soybeans. According to surveys, under normal circumstances, continuous cropping of soybeans reduces yield by 20%-30% or more. The main reasons for the yield reduction: pests and diseases are prone to occur. Several diseases parasitic on soybeans, such as bacterial spot disease, black spot disease, damping-off, and yellow wilt, have suitable conditions for occurrence in continuously cropped soybean soil and will inevitably occur in large numbers

Soybeans are commonly known as yellow beans. Farmers have a traditional habit of planting soybeans this year and continuing to plant them next year, which results in stunted growth, shortness, yellowing leaves, susceptibility to pests and diseases, fewer pods and small seeds, and significantly reduced yield in continuously cropped soybeans. According to surveys, under normal circumstances, continuous cropping of soybeans reduces yield by 20%-30% or more. The main reasons for the yield reduction:

Pests and diseases are prone to occur. Several diseases parasitic on soybeans, such as bacterial spot disease, black spot disease, damping-off, and yellow wilt, have suitable conditions for occurrence in continuously cropped soybean soil and will inevitably occur in large numbers, with nematode disease being especially serious.

Toxic effects of root microbial secretions. Soybean roots can secrete certain acidic substances and form some toxic substances, such as ferrous salts, which remain in the soil, affecting the normal nutritional metabolism of continuously cropped soybeans, causing poor root development, weakened rhizobia activity, and inhibited plant growth, leading to reduced yield.

Excessive consumption of nutrients. Continuous cropping of soybeans excessively consumes phosphorus nutrients in the soil and disrupts the effective nitrogen-to-phosphorus ratio, affecting soybean growth. Therefore, continuous cropping should be avoided in soybean production, and it is best to implement a crop rotation system of more than three years with other crops.

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