Soil physics Soils 33 Soil chemistry 17 Soil moisture 15 Congresses 10 Environmental aspects 6 Analysis 5 Máis ... Research 5 Composition 4 Data processing 4 Mathematical models 4 Methodology 4 Plant-soil relationships 4 Soil mechanics 4 Tillage 4 Andosols 3 Crops and soils 3 Rice 3 Soil erosion 3 Soil percolation 3 Volcanic soils 3 Density 2 Forests and forestry 2 Foundations 2 Intercropping 2 Logging 2 Nitrogen fertilizers 2 Organic fertilizers 2 Sewage sludge as fertilizer 2 Soil pollution 2 menos ...