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<br />2 <br /> <br />I\:)Additionally, the following is a deep percolation comparison of a typical crop rotation in the Grand Valley, <br />f"The comparison is of the base line year and the eleven year average, <br />en <br />OJ <br /> <br />Crop rotation period using base line data. (1986) <br /> <br />4yrs alfalfa x 32.9 ac in/yr = 131. 2 ac in. <br />2yrs corn x 23.8 ac in/yr = 47.6 ac in. <br />2vrs sm.qrain x 12.5 ac in/vr = 25.0 ac in. <br />8yrs 203.8 ac in. <br /> 203.8 in/8yrs =25.5 ac in/yr <br /> (reduction based on ac in/ac basis) <br /> <br />Crop rotation Period using 11 year monitored average <br />(This 11 year average includes the base line data) <br />4yrs alfalfa x 16.8 ac in/yr = 67.2 ac in <br />2yrs corn x 15.9 ac in/yr = 31.8 ac in <br />2vrs Sm.qrain x 23.8 ac in/vr = 47.6 ac in <br />8yrs 146.6 ac in <br /> 146.6 ao in /8yrs = 18.3 aO in/yr <br /> (reduction based on ac iniac basis) <br /> <br />This comparison indicates that the average deep percolation for the eight year crop rotation has been reduced <br />by 7,2 ac inlac/yr, which is a 28,2% reduction, . <br /> <br />NRCS has monitored a complete array of soil types that exist in the Grand Valley, 85 % Of the soil types <br />that exist in on the irrigated acres have been monitored, <br /> <br />PROPOSAL: <br /> <br />7 CFR Pan 702.le states that the Secretary is authorized to monitor and evaluate changes in salt contributions <br />to the Colorado River, The data collected, at a cost of approximately $940,000, over an eleven year period <br />is a comprehensive analysis of the effects of the project on salt contributions to the river, Definite trends <br />have been quantified, Based on the data collected, it is proposed to: <br /> <br />'.. Accelerate IWM efforts with small grain producers <br />.. Direct hydro salinity monitoring efforts that are specific to irrigation systems that support small grain <br />production. The method of monitoring will be use of furrow flumes to measure water on and water off the <br />field, along with evapotranspiration and crop consumptive use data, <br />