Optimum lateral spacing for drip-irrigated corn in the Mediterranean Region of Turkey

Significant second degree polinomial relationships between corn grain yield (Y) versus irrigation water (I) and water use (ET) were found as Y = −0.0037I2 + 5.835I − 1397.7 (R2 = 0.62**) and Y = −0.0039ET2 + 5.926ET − 1365.1 (R2 = 0.54*), respectively. The highest water use efficiency (WUE) was found in A2I100 (1.40 kg m−3) and the lowest one was found in the plant row 1.05 m away from the drip lateral in A3I67 (1.09 kg m−3). Thus a lateral spacing of 1.4 m (one drip lateral per two crop rows) was recommended for drip-irrigated corn in the Mediterranean Region under those specific conditions.