Grasslands 19 Grasslands and Rangelands 14 Grassland ecology 8 Agroforestry 6 Pastures 6 Soil Chemistry and Mineralogy 6 Agriculture 5 Biodiversity 5 Biological Resources (Plant) 5 Ecology 5 Forests 5 Grassland 5 Meteorology and Climate 5 Natural Resource Economics, (New March 2000) 5 Rangelands 5 Sustainability 5 Environmental monitoring 4 Forage and Fodder Crops, (New March 2000) 4 Forage plants 4 Forests and Forest Trees (Biology and Ecology) 4 GRASSLAND 4 Grazing 4 Pollution and Degradation 4 Remote sensing 4 Savannas 4 Agroforestry and Multipurpose Trees: Community, Farm and Social Forestry 3 Climatic change 3 Cycling 3 Deserts 3 Ecosystems 3