Methods of soil investigations for agricultural water engineering - Field tests - Part 13: Determination of carbonate, sulfide, ph-value and iron(II)-ions— 4 стр.
Drainage - Control of sub-surface water management by draining with pipes and amelioration of the subsoil - Part 3: Construction and documentation— 12 стр.
Methods of soil investigations for agricultural water engineering - Physical laboratory tests - Part 13: Determination of soil density, total pore volume and porenumber of mineral soils— 3 стр.
Methods of soil investigations for agricultural water engineering - Field tests - Part 13: Determination of carbonate, sulfide, ph-value and iron(II)-ions— 4 стр.
