WINDS Model Simulation of Guayule Irrigation

Author:

Katterman Matthew E.1,Waller Peter M.1ORCID,Elshikha Diaa Eldin M.1ORCID,Wall Gerard W.2ORCID,Hunsaker Douglas J.2,Loeffler Reid S.1,Ogden Kimberly L.3

Affiliation:

1. Department of Biosystems Engineering, University of Arizona, Tucson, AZ 85721, USA

2. USDA-ARS, Arid Land Agricultural Research Center, Maricopa, AZ 85138, USA

3. Department of Chemical Engineering, University of Arizona, Tucson, AZ 85721, USA

Abstract

The WINDS (Water-Use, Irrigation, Nitrogen, Drainage, and Salinity) model uses the FAO56 dual crop coefficient and a daily time-step soil–water balance to simulate evapotranspiration and water content in the soil profile. This research calibrated the WINDS model for simulation of guayule under full irrigation. Using data from a furrow irrigated two-season guayule experiment in Arizona, this research developed segmented curves for guayule basal crop coefficient, canopy cover, crop height and root growth. The two-season guayule basal crop coefficient (Kcb) curve included first and second season development, midseason, late-season and end-season growth stages. For a fully irrigated guayule crop, the year one midseason Kcb was 1.14. The second year Kcb development phase began after the crop was semi-dormant during the first winter. The second year Kcb value was 1.23. The two-season root growth curve included a growth phase during the first season, no growth during winter, and a second growth phase during the second winter. A table allocated fractions of total transpiration to soil layers as a function of root depth. With the calibrated tables and curves, the WINDS model simulated soil moisture content with a root mean squared error (RMSE) of 1- to 3-% volumetric water content in seven soil layers compared with neutron probe water contents during the two-year growth cycle. Thus, this research developed growth curves and accurately simulated evapotranspiration and water content for a two-season guayule crop.

Funder

Sustainable Bioeconomy for Arid Regions

USDA National Institute of Food and Agriculture

Publisher

MDPI AG

Subject

Water Science and Technology,Aquatic Science,Geography, Planning and Development,Biochemistry

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