Evaluation of salt-tolerant forages for sequential water reuse systems: III. Potential implications for ruminant mineral nutrition |
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| Institution: | 1. Department of LAWR, University of California, Davis, CA 95616, USA;2. USDA-ARS Salinity Laboratory, 450 W. Big Springs Road, Riverside, CA 92507, USA;3. Department of Animal Science, University of California, Davis, CA 95616, USA;4. Department of Plant Science, California State University, Fresno, CA 93740, USA;1. Florida International University, Civil and Environmental Engineering Department, 10555 W. Flagler Street, EC 3781, Miami, 33174 FL, USA;2. Florida International University, Department of Earth and Environment, 11200 SW 8th Street, AHC-5 360, Miami, 33199 FL, USA;1. Department of Anatomy and Histology, Bosch Institute, Sydney Medical School, University of Sydney, NSW 2006, Australia;2. Biomolecular and Physical Sciences, Griffith University, QLD 4111, Australia;3. School of Chemistry, Key Centre for Polymers and Colloids, University of Sydney, NSW 2006, Australia;4. Sydney Translational Imaging Laboratory, Sydney Medical School, University of Sydney, NSW 2006, Australia;1. Department of Ecology, Faculty of Science and Technology, University of Debrecen, 1 Egyetem Sq., H-4010 Debrecen, Hungary;2. Department of Botany, Crop Physiology and Biotechnology, Institute of Plant Sciences, Faculty of Agricultural and Food Sciences and Environmental Management, University of Debrecen, 138 Böszörményi Str., H-4032 Debrecen, Hungary;3. Department of Plant Physiology and Molecular Plant Biology, ELTE Eötvös Loránd University, 1/C Pázmány P. lane, H-1117 Budapest, Hungary;4. Agricultural Research and Development Institute, 30 Szabadság Str., H-5540, Szarvas, Hungary |
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| Abstract: | Reuse of drainage waters is an attractive management option that has been proposed for many irrigated agricultural areas. In California's San Joaquin Valley (SJV), however, drainage effluents are not only saline, but may also contain potentially toxic trace elements such as selenium and molybdenum. Crop suitability for reuse systems depends on the influence the sodium sulfate-dominated waters have on biomass production, plant sustainability, and mineral elements that are critically important for forage quality.Ten promising forage crops were grown in greenhouse sand cultures irrigated with synthetic drainage waters dominated by Na2SO4 with an EC of either 15 or 25 dS/m each containing 500 μg/L Se and Mo as SeO42− and MoO42−. Plant material was analyzed three times for mineral content and selected trace elements that may have a profound influence on ruminant health.Trace element concentrations indicate Se toxicity is of little concern, but that high concentrations of both Mo and S in the herbage may lead to Cu deficiency in ruminants. Similarly, high K/Mg and K/(Ca + Mg) ratios in many of the legume and grass forages, respectively, indicate that there may be potential for development of sub-normal Mg levels (hypomagnesaemia) in ruminants. However, each of these disorders can be avoided or corrected with dietary supplements. The most concern regarding ruminant nutrition based on these data is sulfur toxicity. Sodium-sulfate dominated drainage waters will likely elevate forage S concentrations to levels that might cause excessive sulfide concentrations in the rumen and potentially lead to serious neurological disorders affecting animal health. |
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