The correct answer is a) Soil nutrient depletion.
Continuous cultivation without proper crop rotation can lead to soil nutrient depletion because the same crops are grown in the same area year after year. This can deplete the soil of nutrients that are essential for plant growth, such as nitrogen, phosphorus, and potassium. Over time, this can lead to a decline in crop yields and even crop failure.
Soil erosion is the process of soil being carried away by wind or water. It can be caused by a number of factors, including deforestation, overgrazing, and poor farming practices. Soil erosion can lead to a loss of topsoil, which is the most fertile layer of soil. It can also lead to a decline in crop yields and even crop failure.
Improved soil structure is the result of a number of factors, including the addition of organic matter, the use of cover crops, and the practice of crop rotation. Improved soil structure can lead to increased water infiltration, improved drainage, and increased aeration. It can also lead to increased crop yields.
Increased soil fertility is the result of a number of factors, including the addition of nutrients, the use of cover crops, and the practice of crop rotation. Increased soil fertility can lead to increased crop yields and improved plant health.
In conclusion, continuous cultivation without proper crop rotation can lead to soil nutrient depletion. This can have a number of negative consequences, including a decline in crop yields and even crop failure.