Plantation crops 42 Agriculture 15 Economics 12 English poetry criticism-- Literature 10 English fiction criticism-- Literature 8 Entomology 8 Botany 7 Dye 6 Pests 6 Photochemistry 6 Plant Protection 6 Plant pathology 6 Pulse crops 6 Soil science 6 Agricultural chemistry 5 Engineering 5 Field Crops 4 Mass spectrometry 4 Pasture Plants 4 Plant Propagation 4 Tropical agriculture 4 agricultural development 4 DNA 3 Economic growth 3 Economic growth and development-- Economic Planning 3 English Literary Criticism; English Literature 3 English drama-- William Shakespeare literature 3 International economics 3 Literary criticism-- Philosophy & theory of literature 3 Management 3