hydromeliorations agricultural engineering 52 drainage 34 agriculture 28 irrigation 20 water structures 15 agrochemistry 12 more ... hydraulic structures 10 water management 9 water courses regulation 9 physiology 8 sewerage 5 reclaimed soils 4 peat 4 sanitization structures 4 fertilization 3 channels 3 meliorace 3 drainage of wet grounds 3 underground water 3 buildings (construction) 3 irrigated soils 3 drenáže (odvodňování) 2 Earth remote sensing 2 ecology 2 files 2 fertilizers 2 hydropedology 2 forestry 2 costs 2 less ...