Plants are valuable resources for all living organisms that provide food, medicine, produce oxygen and regulate the water cycle. This book has updated information on agricultural land management by using organic waste or recycling organic waste, heavy metal contaminated groundwater, using gypsum and integrated management of soil for improving crop productivity. While the main emphasis is given to increasing the proper and balanced use of mineral fertilizers, the role of organic manure, biofertilizers, and green manuring and recycling of organic wastes should be considered supplementary and not substitutable.