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11Digital revistaSCIELO
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12Digital revistaSCIELO
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13Nitrate-nitrogen status and movement in soils irrigated with untreated sewage water Nitrate-nitrogen status and movement in soils irrigated with untreated sewage waterpar Schalscha, E., Joint FAO/IAEA Div. of Atomic Energy in Food and Agriculture, Vienna (Austria) eng, Research Co-ordination Meeting on Soil Nitrogen as Fertilizer or Pollutant eng 3 Jul 1978 Piracicaba (Brazil), Vergara, I., Gesellschaft fuer Strahlen- und Umweltforschung G.m.b.H., Munich (Germany, F.R.) oth
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14par Castañeda Ramírez, Gloria Sarahí Doctora autora 22568, Lara Vergara, I. Y. autor/a, Torres Acosta, Juan Felipe de Jesús Doctor autor 20228, Sandoval Castro, Carlos Alfredo Doctor autor 21287, Sánchez, José E. Doctor autor 5443, Ventura Cordero, Javier autor, García Rubio, Virginia Guadalupe autora, Aguilar Marcelino, Liliana autora 14446Texto bibliotecaECOSUR