Crops and soils 4 Soil science 4 AFFORESTATION OF WASTELANDS 1 BIOFERTILIZERS 1 CROPS AND SOILS 1 Climatology, Crops development, Soil cultivation, Manures, Fertilizers, Agroforestry 1 Crop growth- Soil 1 Crop production 1 Crop production-soil fertility 1 Crop science 1 Crop yields 1 Crop yields - physical environment 1 Crops 1 Crops and climate 1 Decision making 1 FOREST NURSERY 1 FOREST SOIL 1 Field Crops, (New March 2000) 1 Land use, Rural 1 Mathematics and Statistics 1 PROPAGATION OF PLANTS 1 Plant Cropping Systems 1 Plant-soil relations 1 SEED 1 Simulation models 1 Soil 1 Soil Science (General) 1 Soil chemistry 1 Soil management 1 Soil science--Crops and soils--Plant-soil relationships 1