Cotton Response to Irrigation Interval and Level as Affected by Field Topography Using Subsurface Drip Irrigation

The objective of this study was to determine cotton lint yield, loan value and seasonal water use efficiency resulting from three irrigation intervals and two irrigation levels in a field with variable topography using subsurface drip irrigation.  Irrigation treatments were planted on 16 acres, characterized by decreasing elevations from south to north, with rows oriented north - south.  Effects on cotton lint yield and seasonal irrigation water use efficiency and loan value at each irrigation level/irrigation interval/field position (elevation) combination over a two-year period are discussed.