Explanation:

Crop rotation is the correct answer because it involves growing different types of crops in pre-planned succession. Let's understand each option and why they are incorrect:

Mixed cropping:
Mixed cropping refers to the practice of growing two or more crops together in the same field. This is done to maximize land utilization and increase overall productivity. However, it does not necessarily involve pre-planned succession of different crops.

Inter cropping:
Inter cropping is similar to mixed cropping, where multiple crops are grown together in the same field. The difference is that in inter cropping, crops are selected based on their complementary growth patterns, allowing them to coexist and benefit from each other. Again, this practice does not necessarily involve pre-planned succession.

Field fallow:
Field fallow refers to leaving a field uncultivated for a certain period of time to restore its fertility. This practice is important for maintaining soil health and preventing nutrient depletion. However, it does not involve growing different types of crops in succession.

Crop rotation:
Crop rotation is the practice of growing different crops in a specific sequence over a defined period of time. This involves rotating crops systematically to optimize soil fertility, control pests and diseases, and reduce the need for fertilizers and pesticides. Crop rotation helps break the life cycles of pests and diseases that may be specific to certain crops. It also helps restore soil nutrients as different crops have different nutrient requirements. For example, leguminous crops like peas and beans fix nitrogen in the soil, benefiting the succeeding crop that requires nitrogen. Crop rotation is a well-planned and organized system that ensures the sustainable use of land and promotes overall agricultural productivity.

In conclusion, out of the given options, crop rotation is the correct answer because it involves growing different types of crops in pre-planned succession. This practice helps maintain soil fertility, control pests and diseases, and optimize agricultural productivity.

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