https://eprints.nwisrl.ars.usda.gov/id/eprint/185 2017-03-07T23:07:13Z info:eu-repo/semantics/descriptiveMetadata https://eprints.nwisrl.ars.usda.gov/id/eprint/185/ Water Soluble NO3-Nitrogen, PO4-Phosphorus, and Total Salt Balanced on a Large Irrigation Tract Carter, D.L. Bondurant, J.A. Robbins, C.W. Mass Import - unclassified Return flow from a 82,030-ha (202,700-acre) tract of calcareous silt loam soils irrigated with water diverted from the Snake River in southern Idaho increased the downstream total soluble salt and NO?-N loads, but decreased the downstream PO?-P load. Under the existing water management practice, 50% of the total input water returned to the Snake River as subsurface drainage. Net total soluble salt output was 2.4 metric tons/ha (1.0 English ton/acre) and, on the average, was considerably greater than necessary to maintain a salt balance. Net NO?-N output was 33 kg/ha (30 lb/acre). Only about 30% as much PO?-P left the tract via drainage water as entered the tract in irrigation water. As water passed through the soil, PO?-P was removed by chemical reactions in the soil, thus decreasing the concentration in the subsurface drainage water and decreasing the downstream PO?-P load. Applied P fertilizer was not leached into the drainage water. 1971 Article NonPeerReviewed application/pdf en https://eprints.nwisrl.ars.usda.gov/id/eprint/185/1/168.pdf Carter, D.L. and Bondurant, J.A. and Robbins, C.W. (1971) Water Soluble NO3-Nitrogen, PO4-Phosphorus, and Total Salt Balanced on a Large Irrigation Tract. Soil Science Society of America Proceedings. 35(2):331-335. 0168 0168 info:eu-repo/semantics/objectFile info:eu-repo/semantics/humanStartPage