Manures Fertilizers 4 Nitrogen 3 Soil Fertility 3 Animal Wastes 2 Chemical composition 2 Crop production 2 Fertilizers and other Amendments 2 Irrigation 2 Nutrient availability 2 Phosphorus 2 Plant Production 2 Soils 2 Sustainability 2 Acidic Soils 1 Agricultural Chemistry 1 Agricultural Experiments 1 Agricultural pollution 1 Agriculture 1 Animal Husbandry and Production, (New March 2000) 1 Application date 1 Application methods 1 Application rates 1 Beta vulgaris 1 Beta vulgaris var. saccharifera 1 Boron 1 Boron fertilizers 1 Calcium 1 Calcium fertilizers 1 Carbon 1