Journal Article 1.421 Fertilizers 875 Research Support, Non-U.S. Gov't 419 Soil 398 Nitrogen 356 N762921K75 355 Phosphorus 199 mehr ... 27YLU75U4W 196 Sewage 166 Population 157 Demographic Factors 155 Fertility 150 Population Dynamics 150 Carbon 121 7440-44-0 120 Developing Countries 109 Manure 109 Review 101 Family Planning 99 142M471B3J 84 Carbon Dioxide 84 Asia 81 Research Support, U.S. Gov't, Non-P.H.S. 78 Metals, Heavy 72 Developed Countries 69 Soil Pollutants 67 Economic Factors 65 Population Characteristics 63 Water Pollutants, Chemical 63 Research Methodology 58 weniger ...