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Irrigation Water Conservation Using Wide-spaced Furrows¹

ABSTRACT

Furrow irrigation studies comparing water applications to narrow and wide-spaced furrows were conducted on three crops at thee locations in Oklahoma over eight growing seasons. Wide-spaced-furrow irrigation usually required about half the water of narrow spacing. In 9 of 11 studies, no yield reductions were noted. In the seasons where yield reductions were noted, the atmospheric evaporative demand was high. A simple test was devised to indicate if a season in progress shows high atmospheric demand. The evaporative demand test involves measurement of rainfall and daily wind movement. Using standard National Weather Service instruments, daily average of rain > 1.6 mm between 15 July and 31 Aug. combined with daily wind movement < 155 km in August caused no yield reduction in wide-spaced-furrow irrigation. Wind was measured at the standard height of a "Class A" evaporation pan (51 cm). Conservation of water from wide-spaced-furrow irrigation should be possible on medium to fine textured soils in many semiarid regions of the world.

¹ Contribution from Okla. Agric. Exp. Stn. project 1396-S. Published as Journal manuscript J-3495.

² Prof. of Agron., Prof. of Agric. Engineering, Assoc. Prof. of Agron. Okla. State Univ., Prof. of Agron., Panhandle State Univ., Goodwell, Oklahoma, and former Graduate Student, Departments of Agric. Engineering and Agron., Oklahoma State University, Stillwater, OK 74074, respectively.

Received for publication June 16, 1978. Accepted for publication October 26, 1978.