WATER – YIELD RELATIONS OF DRIP-IRRIGATED PEAS UNDER SEMI-ARID CLIMATE CONDITION

Abstract

The experiment was carried out  in 2016 and 2017 growing seasons to investigate the water-yield relations of drip-irrigated peas under semi-arid climate conditions. There were 5 different irrigation treatments as of: 0% (I0-dry), 25% (I25), 50% (I50), 75% (I75) and 100% (I100-full irrigation).  Amount of irrigation water applied to plants varied between 35 - 254.4 mm in 2016 and between 30 - 270.1 mm in 2017. Plant water consumptions (ET) varied between 235 - 525 mm in 2016 and between 220 - 605 mm in 2017. The greatest seed yields (3742 kg ha-1 in 2016 and 3691 kg ha-1 in 2017) were obtained from I100 treatments and the lowest seed yields (959 kg ha-1  in 2016 and 921 kg ha-1 in 2017) were obtained from I0 treatments. In 2016, water use efficiency (WUE) values varied between 0.41 - 0.71 kg m-3 and irrigation water use efficiency (IWUE) values varied between 1.36 – 2.74 kg m-3. In 2017, WUE values varied between 0.42 - 0.61 kg m-3 and IWUE values varied between 1.24 – 3.07 kg m-3. The yield response factor, ky, was calculated as 1.36 and it was found that the pea was sensitive to water stress