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Title: Evspotranspiration in winter wheat under different grazing and tillage practices in the southern great plains

Author
item Gowda, Prasanna
item Wagle, Pradeep
item MANJUNATHA, PRIYANKA - Oklahoma State University
item Northup, Brian
item Turner, Kenneth
item Neel, James
item STEINER, JEAN - Retired ARS Employee

Submitted to: ASA-CSSA-SSSA Annual Meeting Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 8/15/2018
Publication Date: 11/4/2018
Citation: Gowda, P.H., Wagle, P., Manjunatha, P., Northup, B.K., Turner, K.E., Neel, J.P., Steiner, J.L. 2018. Evspotranspiration in winter wheat under different grazing and tillage practices in the southern great plains [abstract]. ASA-CSSA-SSSA Annual Meeting Abstracts. Available at: https://scisoc.confex.com/scisoc/2017am/webprogram/Paper107451.html.

Interpretive Summary: Abstract only

Technical Abstract: Better understanding of evapotranspiration (ET) dynamics in dryland agricultural ecosystems is vital to sustainable crop and animal production in the Southern Great Plains (SGP). The main objective of this study is to document and compare evapotranspiration (ET) dynamics over a 2016-17 growing season in graze-out, graze-grain, and grain-only winter wheat (Triticum aestivum L.) within a 4-year winter wheat-canola (Brassica napusL.) crop rotation system with conventional and no-till practices. This study is part of the larger SGP Long-Term Agroecosystem Research (LTAR) and GRL-FLUXNET (a cluster of 17 eddy covariance systems) projects at the USDA-ARS Grazinglands Research Laboratory (GRL), El Reno, OK. Biometric measurements (e.g., biomass, leaf area index, percent cover, and canopy height) and ET were measured during the 2016-17 winter wheat growing season. Seasonal rainfall during the winter wheat growing season was 567 mm. Biomass, LAI, and ET rates were higher in the grain-only wheat than graze-grain and graze-out treatments. Daily maximum ET rates ranged from 3.45 (graze-grain) to 5.04 mm (grain-only). Similarly, growing season ET ranged from 396 mm (graze-grain) to 488 mm (grain-only). Long-term year-round measurements from clustered and paired eddy flux towers are needed to provide more insights into the effects of tillage and grazing practices on water budgets of typical wheat cropping systems in the SGP.