Overplanting (planting soybeans in consecutive growing seasons without proper crop rotation) can have some benefits. Soybeans are legumes that fix atmospheric nitrogen, so overplanting can increase the overall nitrogen content in the soil. A dense population of soybeans can suppress weeds, reduce soil erosion, and contribute to soil organic matter. On the downside, overplanting without crop rotation can also increase the risk of diseases, pests, and nutrient imbalances, which may ultimately impact soybean yield and overall soil health.