Irrigation scheduling of Black Gram based on Crop Water Stress Index (CWSI) under drip irrigation

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KHORSAND AFSHIN; REZAVERDINEJAD VAHID; ASGARZADEH HOSSEIN; MAJNOONI HERIS ABOLFAZL; RAHIMI AMIR; BESHARAT SINA

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Journal: Iranian Journal of Soil and Water Research Year:2020 | Volume:50 | Issue:9 Page(s): 2125-2138

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Title

Irrigation scheduling of Black Gram based on Crop Water Stress Index (CWSI) under drip irrigation

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Keywords

Air vapor pressure deficitQ1

Canopy temperatureQ1

Grain yieldQ1

UrmiaQ1

Water stressQ1

Abstract

Empirical and theoretical methods (energy balance) are widely used to calculate the Crop Water stress Index (CWSI) and irrigation scheduling to describe crop water status. In this study, irrigation scheduling was performed at the research farm of College of Agriculture, Urmia University, using a manual infrared thermometer and the empirical method of Idso et al. (1981) for the black gram under different irrigation regimes using drip irrigation in 2017. The experimental design was carried out in a randomized complete block design with three levels of irrigation I1, I2 and I3 which were 50, 75 and 100 percent water requirement in three replications, respectively. Using the baselines obtained for each treatment, the average CWSI values during the growth season of black gram for I1, I2 and I3 treatments were calculated to be 0. 37, 0. 23 and 0. 15 respectively. The relationship between CWSI and total irrigation depth (mm) was determined as CWSI =-0. 0008 (I) + 0. 58, and the relationship between black gram Grain yield (ton/hec) and CWSI was determined as Yield =-1. 8237 (CWSI) + 2. 1435 which their correlation coefficients (R2) were 0. 98 and 0. 99 respectively, which shows the high accuracy of regression models. In general, if the amount of water decreases with stress during the plant growth, the CWSI value increases, and as a result of increasing CWSI, the crop Grain yield decreases. Finally, the no stress treatment (I3) with CWSI=0. 15 was the basis for irrigation scheduling and then some relationships were established for determining the irrigation time using CWSI in Urmia climate for four stages of black gram growth; flowral induction-flowering, pod formation, seed and pod filling, and physiological maturity as (Tc ̶ Ta)C = 1. 9498 ̶ 0. 1579(AVPD), (Tc ̶ Ta)C = 4. 4395 ̶ 0. 1585(AVPD), (Tc ̶ Ta)C = 2. 4676 ̶ 0. 0578(AVPD) and (Tc ̶ Ta)C = 5. 7532 ̶ 0. 1462(AVPD), respectively.

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APA: Copy

KHORSAND, AFSHIN, REZAVERDINEJAD, VAHID, ASGARZADEH, HOSSEIN, MAJNOONI HERIS, ABOLFAZL, RAHIMI, AMIR, & BESHARAT, SINA. (2020). Irrigation scheduling of Black Gram based on Crop Water Stress Index (CWSI) under drip irrigation. IRANIAN JOURNAL OF SOIL AND WATER RESEARCH, 50(9 ), 2125-2138. SID. https://sid.ir/paper/225354/en

Vancouver: Copy

KHORSAND AFSHIN, REZAVERDINEJAD VAHID, ASGARZADEH HOSSEIN, MAJNOONI HERIS ABOLFAZL, RAHIMI AMIR, BESHARAT SINA. Irrigation scheduling of Black Gram based on Crop Water Stress Index (CWSI) under drip irrigation. IRANIAN JOURNAL OF SOIL AND WATER RESEARCH[Internet]. 2020;50(9 ):2125-2138. Available from: https://sid.ir/paper/225354/en

IEEE: Copy

AFSHIN KHORSAND, VAHID REZAVERDINEJAD, HOSSEIN ASGARZADEH, ABOLFAZL MAJNOONI HERIS, AMIR RAHIMI, and SINA BESHARAT, “Irrigation scheduling of Black Gram based on Crop Water Stress Index (CWSI) under drip irrigation,” IRANIAN JOURNAL OF SOIL AND WATER RESEARCH, vol. 50, no. 9 , pp. 2125–2138, 2020, [Online]. Available: https://sid.ir/paper/225354/en

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