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Plant Science Today (PST)

Research Articles

Vol. 11 No. sp4 (2024): Recent Advances in Agriculture by Young Minds - I

Assessment of maize evapotranspiration, water requirements and productivity using weather data in Coimbatore’s semiarid climate

DOI
https://doi.org/10.14719/pst.5246
Submitted
24 September 2024
Published
23-12-2024 — Updated on 09-03-2025
Versions

Abstract

Accurately estimating crop water use is crucial for efficient water management in conservation agriculture, especially in Coimbatore's semiarid climate. This study assessed maize water use and productivity over three growing seasons (2023- 2024) at Agricultural College and Research Institute (AC & RI), Coimbatore. Irrigation applied each season varied between 500.8mm and 554.1 mm, averaging 535.8 mm, while total water supply ranged from 810.6 to 985.3 mm. Actual evapotranspiration (ETa) was estimated using locally developed crop coefficient curves (Lkc) and Food and Agriculture Organization (FAO) crop coefficients (Kc). Water productivity for maize was calculated based on these estimates. Daily ETa for maize ranged from 0.9 mm to 8.2 mm. Other than the different seasons, ETa varied from 342.6 to 372 mm, averaging 355.6 mm with the Lkc curve. By FAO Kc, ETa ranged from 400.8 mm to 479.1 mm, with an average of 444.2 mm. The irrigation requirement ranged from 579.6 mm to 672.7 mm, with an average of 629.5 mm using Lkc. Using FAO Kc, the range was 637.8 mm to 762.9 mm, with an average of 718 mm. Crop water use efficiency (CWUE) ranged from 0.8 and 0.9 kg/ m³, with an average of 0.9 kg/m³. The evapotranspiration water use efficiency (ETWUE) ranged from 2.0 to 2.1 kg/m³, with an average of 2.1 kg/m³. The irrigation water use efficiency (IWUE) varied across seasons, averaging 1.4 kg/m³. Strong correlations were observed between CWUE, IWUE and the amount of seasonal irrigation (R² = 0.98 and 0.99, respectively). CWUE and ETWUE strongly correlated with IWUE (R² = 0.98 and 0.75, respectively). These findings suggest that maize irrigation in Coimbatore's semiarid regions should be tailored to local conditions to enhance water productivity.

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