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Plant Science Today (PST)

Research Articles

Vol. 12 No. sp3 (2025): Advances in Plant Health Improvement for Sustainable Agriculture

Estimation of crop coefficient for radish using digital lysimeter under polyhouse

DOI
https://doi.org/10.14719/pst.8236
Submitted
13 March 2025
Published
15-07-2025

Abstract

Accurate quantification of crop water requirements of any crop is essential for irrigation scheduling and water management. The objective of this study was to estimate the crop coefficient of radish for different phenological stages under protected cultivation using digital lysimeter. The experiment was carried in the Agricultural Engineering College and Research Institute, Kumulur, Trichy. The experiment layout has been made to accommodate the three treatments (T1 - 120 % of ETc, T2 - 100 % of ETc and T3- 80 % of ETc) and four replications in drip irrigated polyhouse. The actual crop evapotranspiration (mm day-1) measured from digital lysimeter and ETo is the reference evapotranspiration (mm day-1) measured from Hargreaves model. The crop coefficient value of radish grown under protected cultivation during initial stage (Kcin), development stage (Kcdev), mid-stage (Kcmid) and final stage (Kcfin) for T1 was 0.72, 0.99, 1.01 and 0.81, T2 was 0.58, 0.84, 0.85 and 0.63 and T3 was 0.43, 0.61, 0.62 and 0.48 respectively. The study demonstrated that supplying additional water had no significant effect in radish yield under polyhouse. The crop coefficient (Kc) value obtained for treatment 100 % of ETc is suggested for optimal use of irrigation water for cultivating of radish crop in naturally ventilated greenhouse.

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