Soil science 667 Agricultural chemistry 438 Soil Science 217 Soil chemistry 135 Soil fertility 104 Soils 94 Soil 90 Soil conservation 78 soil science 74 Soil microbiology 61 Soil Science and Agricultural Chemistry 58 Soil physics 58 Agriculture 51 Soil management 49 Soil analysis 48 Soil conditioners 47 Agronomy 42 Irrigation 41 soil fertility 41 Fertilizers 40 Soil erosion 39 Soil pollution 37 Soil mechanics 36 Soil ecology 34 SOIL 32 soil chemistry 30 Soil Biology 26 soil acidity 26 Crop production 25 Soil biology 24