OKLAHOMA SOIL FERTILITY HANDBOOK
Cation Exchange Capacity (CEC)-2
FAO Irrigation and Drainage Paper No.24
Water Quality for Irrigated Agriculture -Salinity Sodicity Focus
Agriculture Drip Irrigation Scheduling Calculator Users Guide
土壤张力计读数标准—美国Kansas State University
手感法测水分标准—estimating soil moisture—USDA
Fao推荐的84种作物系数
蔬菜施肥技术
根系对水分的吸收
