Fertilizer agriculture 2 economy 2 Agriculture 1 Annual 1 Arid zone soils 1 Economics 1 Erosion control Organic Soils 1 Microelements 1 Mineral Soils 1 Plant Nutrition 1 Production 1 Rain water harvesting 1 Soil fertility 1 Soil fertility complex 1 Soil organisms Soil erosion 1 Soil reaction 1 Soil science 1 Soil water Soil colloids 1 Soils 1 Soli fertility 1 crops 1 fertilizer consumption-Kerala 1 productivity 1