agriculture forestry 78 agrochemistry 67 soil science 57 chemistry 39 economy 37 permanently sustainable development 37 more ... fertilizers 32 agricultural engineering 31 agricultural economics 30 plant breeding 30 animal husbandry 29 history 29 plant production 29 botany 26 plant physiology 26 hydromeliorations 25 soil protection 25 environment 25 feeds 24 statistics 21 land 20 microbiology 19 yields 19 fertilization 18 economizing 18 agricultural machinery and equipment 18 animal production 17 farm animals 15 plants 15 less ...