Crop yields 78 Crops 16 Congresses 15 Food crops 15 Agricultural productivity 11 Physiology 11 Mathematical models 10 més ... Agriculture 9 Yields 9 Crop Yields 8 Crops and climate 8 Fertilizers 7 Rice 6 Climatic changes 5 Field crops 5 Quality 5 Crops and water 4 Food supply 4 Agricultural estimating and reporting 3 Cotton 3 Crops and soils 3 Economic aspects 3 Farm management 3 Growth 3 Research 3 Agricultural ecology 2 Arid regions agriculture 2 Crops yields 2 Farm produce 2 Fertilization of plants 2 menys ...