Agronomy is the science and technology of studying plants for agriculture for food, fibre, fuel, crop production, soil management and land restoration. Agronomists specialise in the areas of crop rotation, irrigation, drainage, plant breeding, soil classification, plant physiology, soil fertility, weed control, insect and pest control. The Agroecology works with the areas of sustainable agriculture, organic farming, alternative food and cropping systems. The Agricultural scientists focus on important issues on agricultural research, in different fields of agricultural sciences. They work on crop sciences, forestry sciences and natural resource management sciences for impacting agriculture growth and development globally. The fertilizer is one of the essential for the growth of plants. Fertilizers enhance the effectiveness of the soil by modifying water retention and aeration. The three fertilizers providing nitrogen, phosphorus and potassium are NPK Fertilizers.