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Arkansas - CSU Revised Lysimeter Project_Application
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Arkansas - CSU Revised Lysimeter Project_Application
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Last modified
7/28/2009 2:59:27 PM
Creation date
11/29/2007 1:53:04 PM
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WSRA Grant and Loan Information
Basin Roundtable
Arkansas
Applicant
Colorado State University
Description
Direct Determination of Crop Evapotranspiration in the Arkansas Valley with a Weighing Lysimeter
Account Source
Basin
Board Meeting Date
1/22/2008
WSRA - Doc Type
Grant Application
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Water Supply Reserve Account ? Grant Application Form <br />Form Revised May 2007 <br />_______________________________________ <br />5. Please summarize the proposed scope of work. <br />The results from this project at the Arkansas Valley Research Center (CSU AVRC) will provide field <br />measurements of ET for the major crops grown in the Arkansas Valley and calibration of the Penman-Monteith <br />equation for computing ET for a range of crops grown in the Valley. The end result will be a data set to help <br />address issues between Colorado and Kansas on water consumption by crops grown in the Arkansas River valley. <br />I.Project Tasks <br />Task 1: Determine consumptive water use and crop coefficients for crops grown in the Arkansas Valley. <br />1a. Construction of lysimeters ? two lysimeters are required for the proposed project. The large weighing <br />lysimeter (test lysimeter) has been constructed and is currently undergoing testing and instruments are being <br />calibrated. This unit consists of a 3m x 3m block of soil mounted on a scale for accurate weighing of water use by <br />the growing crop. A smaller lysimeter (reference lysimeter), 1m x 1m, will be installed in the spring of 2008. <br />1b. Cropping patterns ? The basic approach involves growing a reference crop, alfalfa, on the small reference <br />lysimeter and growing a range of crops over the next decade on the test lysimeter. Initially, alfalfa will be grown <br />on both lysimeters to insure that valid and reproducible data are obtained from both lysimeters. The sequence of <br />crops grown will reflect the major crops grown in the Valley and it is envisioned that the following sequence of <br />studies will be conducted. <br />Crop Year Crop Grown on Test Lysimeter <br />2008 <br />Alfalfa <br />2009 <br />Alfalfa <br />2010 <br />Alfalfa <br />2011 <br />Corn <br />2012 <br />Corn <br />2013 <br />Wheat <br />2014 <br />Wheat <br />2015 <br />Onions <br />2016 <br />Onions <br />2017 <br />Soybeans or Dry Beans <br />2018 <br />Soybeans or Dry Beans <br />2019 <br />Sorghum or vegetable <br />2020 <br />Sorghum or vegetable <br />The same crop will be grown on the test lysimeter and the surrounding land to provide an environment for the <br />lysimeter that is identical to a larger production field of the crop. The crop in the lysimeter and the surrounding <br />field are grown using standard agricultural production practices including irrigation, tillage, pest control, and <br />fertilization. <br />6 <br />
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