Agriculture 276 Plantation crops 162 Crop improvement 147 Crop production 114 Agronomy 109 Crops 104 Horticulture 88 Plant Propagation 76 Biotechnology 69 Field crops 67 Plant breeding 67 Plant Breeding and Genetics 63 Plant diseases 61 Plant pathology 60 Fruit crops 52 Field Crops 51 Horticultural Crops, (New March 2000) 48 Plant Biotechnology 44 Plant Production 44 Feild crops 41 Horticultural crops 41 Dissertations, Academic (Ph.D) 40 Plants 40 Vegetable crops 40 Microbiology 39 Soil Science and Agricultural Chemistry 39 Soil science 39 Plant protection 38 Vegetables 38 Field Crops, (New March 2000) 35