PJB-2022-199
DEFINING IRRIGATION SCHEDULING BASED ON CROP WATER STRESS INDEX AND PHYSIOLOGICAL PARAMETERS FOR HYBRID CORN IN SEMI-ARID CLI-MATE
ALI BEYHAN UCAK
Abstract
Innovative agricultural technologies offer the ability to enhance crop yield while reducing the requirement of more irrigation water. The goal of this study is to determine the crop water stress index (CWSI) and irrigation scheduling based on CWSI values, as well as to examine the correlations between CWSI, physiological parameters and grain yield of corn hybrid P31A34 in semi-arid climate conditions. Experiments were conducted in 2014 and 2015 season at the Research Center of Siirt University, Turkey. There were three types of irrigation treatments: 100% (I100), 70% (I70) and 35% (I35). The amount of irrigation water applied to I100 was 644 mm in first year and 672 mm in second year. Plant water consumption (ET, mm) was 678.72 mm and 706.33 mm in the first and second years, respectively, with grain yield (GY) of 1220 and 1130.66 kg da-1. Tc-Ta=0.769- 2.544 VPDx and 1.596-2.479 VPDx were obtained as the lower limit (LL) values, which were required to calculate CWSI without water stress in the first and second years. In 2014 and 2015, the upper limit (UL) temperatures were at 1.178 °C and 2.38 °C respectively. When the corn grain yield began to decline, the CWSI threshold value was 0.34, indicating the yield limit. Grain yield, When comparing water deficit treatments to full irrigation, the leaf area index (LAI) and chlorophyll content (CC) decreased dramatically, and there was a significant positive correlation between CWSI and GY. The findings revealed that in semi-arid climate conditions, a maximum of 30% water deficit can be used during the growing period of the corn compared to full rrigation (I100) for water savings, and that water deficits greater than 30% result in considerable grain yield losses. In areas where water resources are limited, the moderate water deficit (I70) may be a viable alternative to the I100.
To Cite this article:
Download
