Which of the following is not a purpose of preparing manures in sustainable agriculture?

Preparing manures is an important part of sustainable agriculture, as it helps to improve soil quality and provide plants with essential nutrients for growth. The primary purposes of preparing manures include:

 To provide plants with essential nutrients: Manures contain a variety of nutrients, such as nitrogen, phosphorus, and potassium, which are essential for plant growth and development.

To improve soil structure: Manures help to improve soil structure by increasing soil organic matter, promoting soil aggregation, and enhancing soil water-holding capacity.

To increase soil fertility: Manures improve soil fertility by providing essential nutrients for plant growth and supporting the growth of soil microorganisms that help to release nutrients from the soil.

Degrading the soil structure is not the purpose of preparing manures. In fact, manures are used to improve soil structure and prevent soil degradation.

Therefore, the purpose of preparing manures is not to degrade the soil structure, but rather to improve soil quality, provide essential nutrients for plant growth, and support sustainable agriculture practices.