The benefits of planting grass-legume mixture does not include

Planting grass-legume mixture has numerous benefits, such as higher productivity of the pasture, suppression of weeds, prevention of soil erosion, and improvement of soil fertility. Therefore, the option that does not include the benefits of planting grass-legume mixture is "decreased soil fertility." Planting a grass-legume mixture can help improve soil fertility by fixing atmospheric nitrogen into the soil through the legume component. The nitrogen-fixing capability of legumes helps to provide a natural source of nitrogen to the soil, which can benefit the grass component of the mixture.