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ArkValley Irrigation Grant Final Report
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ArkValley Irrigation Grant Final Report
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Last modified
10/24/2011 3:47:47 PM
Creation date
9/30/2006 9:02:48 PM
Metadata
Fields
Template:
Water Conservation
Project Type
Ag/Muni Grant
Applicant
Colorado State University Cooperative Extensions
Project Name
Improvement of Irrigation Technology in Arkansas River Valley
Title
Demonstrations of Irrigation Technology to Improve Crop Yields, Returns and Water Quality in the Arkansas River Valley of Colorado Summary and Conclusions
County
Larimer
Water Conservation - Doc Type
Final Report
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ArkValley Irrigation Grant Applic
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Path:
\Water Conservation\Backfile
ArkValley Irrigation Grant Prog Report
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\Water Conservation\Backfile
ArkValley Irrigation Grant SOW
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Path:
\Water Conservation\Backfile
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<br />~ <br />. <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />. <br /> <br />.. <br /> <br />Technical Advisors: <br /> <br />Dr. Gary Banuelos <br />SoiVPlant Scientist <br />USDA-ARS Water Research Laboratory <br />Fresno, California <br /> <br />Dr. James H. Rhoades <br />Director <br />USDA-ARS Salinity Laboratory <br />Riverside, California <br /> <br />DISCUSSION <br /> <br />Preliminary Soil Tests <br /> <br />Initial soil tests indicated an extremely high salt content on both of the fields being used on this project. <br />Analysis of composite soil samples taken from the two fields used in the demonstration showed electrical <br />conductivity (EC), a measure of salts, at the surface foot in Pivot #7 to average 5.2 mmhos/cm while. <br />EC ranged from 4.7 mmhos/cm on the Apishapa silt clay to 6.9 mmhos/cm on the Bloom silt loam in <br />Pivot #8. Sub soil samples in Pivot #7 ranged from a low of6.1 at the 10 foot level to 8.8 mmhos/cm at <br />the 3 foot level. EC on the Bloom silt loam was 13.6 mmhos/cm at the 2 foot level while staying in the <br />7.3 or less in the Apishapa silty loam, Table 2. <br /> <br />Pivot #7 <br /> <br />Alfalfa was planted on Pivot #7 in the late summer of 1995 but excessive rains in August and the high <br />salt content of the soil and irrigation water caused a total crop failure. <br /> <br />Looking for forage crops with more salt tolerance, grasses and sorghum-sudangrass were planted in <br />1996, again resulting in a crop failure as adequate stands were not achieved. In the spring of 1996, four <br />different mixtures of grasses were planted under the first four spans of the pivot and sorghum-sudangrass <br />was planted under the other four spans on August 15 and 16 with a Krause drill. <br /> <br />The grasses and mixtures were as follows: <br />Span # I - 75% Paiute Orchardgrass <br />25% Lincoln Smooth Bromegrass <br /> <br />Span #2 - <br /> <br />100% NewHy Wheatgrass <br /> <br />Span #3 - <br /> <br />33% NewHy Wheatgrass <br />33% Manska Pubescent Wheatgrass <br />34% Monarch Cicer Milkvetch <br /> <br />Span #4 - <br /> <br />23% NewHy Wheatgrass <br />22% Paiute Orchardgrass <br />22% Oahe Intermediate Wheatgrass <br />34% Noreen Birdsfoot Trefoil <br /> <br />15 <br />
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