agriculture 1,294 forestry 71 agrochemistry 67 soil science 58 chemistry 39 permanently sustainable development 39 economy 36 more ... fertilizers 33 plant breeding 33 history 31 agricultural economics 31 agricultural engineering 30 animal husbandry 29 plant production 29 plant physiology 28 botany 27 soil protection 27 environment 26 hydromeliorations 24 feeds 24 microbiology 21 land 21 statistics 21 yields 21 alternative agriculture 20 fertilization 18 economizing 18 agricultural machinery and equipment 17 animal production 17 plants 16 less ...