The correct option is C. Crop rotation before planting. Detailed Explanation: Post-Harvest Management refers to the practices that are implemented after the harvest of crops to maintain their quality, reduce losses, and ensure that they are safe for consumption. The goal of post-harvest management is to preserve the harvested products until they reach the consumer, which involves various techniques and methods. Let’s analyze each option: A. Proper drying of grains - Explanation: Proper drying is a critical post-harvest management practice. After harvesting, grains contain moisture that can lead to spoilage, mold growth, and pest infestations. By drying grains to the appropriate moisture content, farmers can significantly extend the shelf life of the grains and maintain their quality. This practice is essential for preventing losses and ensuring food safety. B. Use of preservatives in storage - Explanation: The use of preservatives is another important post-harvest management technique. Preservatives can help inhibit the growth of microorganisms and pests during storage, thereby prolonging the life of the stored products. This can include chemical preservatives or natural substances that help maintain the quality of the crops. C. Crop rotation before planting - Explanation: Crop rotation is a farming practice that involves alternating the types of crops grown in a particular area from season to season. While crop rotation is beneficial for soil health, pest management, and improving crop yields, it is not a post-harvest management practice. Instead, it is a pre-planting agricultural practice aimed at enhancing soil fertility and reducing disease and pest cycles. Therefore, this option does not fit the definition of post-harvest management. D. Temperature control during storage - Explanation: Temperature control is a vital aspect of post-harvest management. Maintaining the right temperature during storage can prevent spoilage and extend the shelf life of perishable products. For example, storing fruits and vegetables at cooler temperatures can slow down respiration and decay processes, ensuring that they remain fresh for a longer period. Why the Other Options Are Wrong or Weaker:

• Option A (Proper drying of grains): This is a fundamental post-harvest practice that directly impacts the quality and longevity of grains. It is essential for preventing spoilage and is widely recognized as a best practice in post-harvest management.
• Option B (Use of preservatives in storage): This practice is also crucial for maintaining the quality of stored products. It is a well-established method to prevent spoilage and is commonly used in various agricultural products.
• Option D (Temperature control during storage): This is another key practice in post-harvest management. Proper temperature regulation is critical for preventing spoilage and ensuring that products remain safe for consumption.

Summary of Key Points:

• Post-harvest management includes practices that maintain crop quality after harvest.
• Proper drying, use of preservatives, and temperature control are all essential post-harvest practices.
• Crop rotation is a pre-planting practice and does not fall under post-harvest management.
• Understanding the distinction between pre-planting and post-harvest practices is crucial for effective agricultural management.

By focusing on these practices, farmers can significantly reduce losses and improve the quality of their agricultural products, ensuring better outcomes for both producers and consumers.