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Article

Water Stress Thresholds and Evaluation of Coefficient Ks for Perennial Ryegrass in Tropical Conditions

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Corporación Colombiana de Investigación Agropecuaria—AGROSAVIA, Centro de Investigación Tibaitatá—Km 14 Vía Mosquera, Bogotá 250047, Colombia
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Research Institute of Water and Environmental Engineering (IIAMA), Universitat Politècnica de València, 46022 Valencia, Spain
*
Author to whom correspondence should be addressed.
Academic Editor: Alejandro Galindo
Water 2022, 14(11), 1696; https://doi.org/10.3390/w14111696
Received: 16 April 2022 / Revised: 11 May 2022 / Accepted: 20 May 2022 / Published: 25 May 2022
(This article belongs to the Special Issue Crop Water Stress and Deficit Irrigation)
Perennial ryegrass (Lolium perenne) is the predominant forage crop in the equatorial highland zones of Colombia due to its high nutritional value and versatility to produce both milk and meat. This study aimed to determine the relationship between the relative depletion of usable soil water and the Ks values of canopy expansion and closure stomatal of perennial ryegrass, as well as to identify the threshold values of water stress. The experiment was carried out in pots under a controlled environment condition. These pots were arranged in a completely randomized manner. The experiment consisted of five treatments—including control treatment—of water deficits in the soil that progressively increased the depletion level as the crop cycle developed. This generated a wide range of conditions in the growth stages. For each treatment, four repetitions were performed Biomass production was significantly affected by water stress. The results show that the upper and lower thresholds of Ks were 0.28 and 1.3 of the depletion level (p) of the total available water (TAW) in the soil for the expansion of the canopy (CE), and 0.25 and 1.1 p of the TAW for stomatal closure (gs). Quadratic functions were fitted for both the CE (R2 = 0.72) and CS (R2 = 0.73); moreover, the Ks function of FAO-AquaCrop with positive shape factor (sf) was as follows: sf = 11, RMSE 0.22 for CE, and sf = 4.3, RMSE 0.19 for gs. Our results indicate that ryegrass is moderately sensitive to water stress. The differences found between the Ks function of FAO and the experimental data call for the need to use modeling with parameters adapted for each case. View Full-Text
Keywords: dry matter production; forage; stress coefficient Ks; soil water depletion dry matter production; forage; stress coefficient Ks; soil water depletion
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MDPI and ACS Style

Terán-Chaves, C.A.; García-Prats, A.; Polo-Murcia, S.M. Water Stress Thresholds and Evaluation of Coefficient Ks for Perennial Ryegrass in Tropical Conditions. Water 2022, 14, 1696. https://doi.org/10.3390/w14111696

AMA Style

Terán-Chaves CA, García-Prats A, Polo-Murcia SM. Water Stress Thresholds and Evaluation of Coefficient Ks for Perennial Ryegrass in Tropical Conditions. Water. 2022; 14(11):1696. https://doi.org/10.3390/w14111696

Chicago/Turabian Style

Terán-Chaves, César Augusto, Alberto García-Prats, and Sonia Mercedes Polo-Murcia. 2022. "Water Stress Thresholds and Evaluation of Coefficient Ks for Perennial Ryegrass in Tropical Conditions" Water 14, no. 11: 1696. https://doi.org/10.3390/w14111696

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