Agronomy is a division of agricultural science embracing preparation of soil in accordance with crop demands, enriching the soil with organic matter and plant nutrients, choice of crops and varieties to fit the climate, crop rotation and intercropping, suitable dates of sowing, moisture regulation and drainage, weed management, harvesting and processing to an extent. It deals essentially with all aspects of soil, crop and water management to increase productivity of crops. It is therefore essential that the students of agriculture have a good grasp of the principles of agronomy.