Microdrip Irrigation of Field Crops

摘要: Microdrip irrigation supplies water at a rate close to that of plant uptake. It is thus expected improve yields and reduce losses from drainage below the root zone. To test this assumption, four drip treatments were applied on corn (Zea mays L.) Bet Dagan, Israel: (i) daily with 2 L h -1 emitters (2-D); (ii) twice-weekly (2-TW); (iii) weekly (2-W); (iv) microdrip 0.25 (0.25-D). Total was similar for all treatments. Soil content depth distribution monitored by neutron scattering method. uptake (sap flow, SF) measured using heat pulse method two consecutive periods wk. Relative drying 0.60- 0.90-m soil layer observed only in treatment. These might indicate different structure or patterns because low application rate. Highest estimated fluxes obtained 2-D treatment lowest 0.25-D treatment, especially end growing period. The SF/ET, ratio steadiest relationship canopy conductance vapor pressure difference not those 2-TW. Lower values 2-W cycle. Daily led highest yield, while lowest. results