The correct answer is D. All of the above.
Continuous cropping without proper crop rotation can lead to soil fertility depletion, increased pest problems, and lower crop yields.
Soil fertility depletion occurs when the same crops are grown in the same field year after year. This can lead to a decline in the levels of nutrients in the soil, as these nutrients are taken up by the plants. This can make it difficult for the plants to grow and produce a good yield.
Increased pest problems can also occur with continuous cropping. This is because pests can build up in the soil over time, as they find a suitable food source in the same crop year after year. This can lead to an increase in the number of pests, which can damage the crops and reduce the yield.
Lower crop yields can also occur with continuous cropping. This is because the plants may not be able to grow as well in soil that is depleted in nutrients. This can lead to a decrease in the amount of produce that is produced, which can reduce the farmer’s income.
To avoid these problems, it is important to rotate crops. This means growing different crops in the same field each year. This helps to prevent the depletion of nutrients in the soil and the build-up of pests. It also helps to improve the overall health of the soil.