The correct answer is: d) Pulses.
Pulses are a type of legume that are grown as a cover crop to improve soil health and fertility. They are a good source of nitrogen, which helps to improve the growth of other plants. Pulses also help to improve soil structure and drainage.
Maize, wheat, and mustard are all cereal crops that are not typically grown as cover crops. Maize is a major cereal crop that is grown for its grain. Wheat is another major cereal crop that is grown for its grain. Mustard is a cruciferous vegetable that is grown for its leaves and seeds.
Pulses are a good choice for a cover crop because they are nitrogen-fixing plants. This means that they can take nitrogen from the air and convert it into a form that can be used by other plants. This helps to improve the fertility of the soil and makes it more productive.
Pulses also help to improve soil structure and drainage. They do this by adding organic matter to the soil. Organic matter helps to improve the water retention capacity of the soil and makes it easier for roots to grow.
Overall, pulses are a good choice for a cover crop because they help to improve soil health and fertility. They are a good source of nitrogen, which helps to improve the growth of other plants. Pulses also help to improve soil structure and drainage.