SU0004350 SSNL - Laserfiche WebLink

Home Browse Search

1 wastes and should be incorporated in the agricultural waste management system. Based upon data available from NRCS all sol M � Is have slopes between 0 to 2 percent; therefore, the limitation-for the.application of agricultural waste is slight. Sodium adsorption ` Sodium adsorption is represented by the Sodium Adsorption Ratio (SAR), which is the measured . amount of sodium relative to calcium and magnesium in a water extract from a saturated soil paste. A high and moderate SAR, more than 4, interferes with the ability of the plant to absorb water from the soil and to exchange plant nutrients. This interference reduces plant growth and seed germination and limits the choice of crops that can be successfully grown. A SAR of more f than 13 has a detrimental effect on soil intake, permeability, and structure. Limitations for the application of agricultural wastes are slight if SAR less than 4, �= moderate if it is 4 to 13, and severe if it is greater than 13. Soils that have moderate limitations affect the choice of crops that can be grown and reduce germination. To prevent increasing soil SAR and further degradation of soil properties, agricultural wastes that are high in sodium should not be applied to soils that have a moderate or severe rating. Agricultural F wastes that have low sodium content and a high C:N ratio can be applied and d wIII have a , beneficial Impact on soils that have a moderate or severe SAR rating. Application of agricultural wastes that have low salt content and a high C:N ratio to these soils improves soil intake, j r permeability, and structure. It also reduces thelant t p axicity effect of soil sodium. An evaluation of the limitations for the application of agricultural wastes based upon the SAR value for the site soils, will be presented when laboratory results will be.avaiiable. i Monitoring the Nitrogen Application A program to monitor the Nitrogen application from lagoon water was provided to Western Design by Mrs. Marsha Campbell Matthews of the University of California Cooperative Extension (copy attached). This an Excel file where the input data are acres, crop information (date planted, date harvested), total wet tons, moisture percentage, pumping rates, N wanted on crop, commercial N lbs/acre, estimates of the irrigation times, and laboratory results. It calculates the actual Nitrogen per acre applied, total absorbance, estimated wet tons/area, lbs/area protein N, and lbs/area nitrate N. Laboratory Analysis of Soil Samples Soil samples were collected at those locations shown on the attached map in Appendix D. Soil samples were submitted to A&L Western Agricultural Laboratories in Modesto, California, for analysis of the following constituents: Nitrate Nitrogen i Soluble Salts Refer to page 22 for Endnotes and Reference sources >ri Y ®Western Dairy Design Associates,Inc.2003 Page 17 i