00482naa a2200181 a 450000100080000000500110000800800410001910000180006024500780007826000090015665000100016565000160017565000250019165000090021665300090022570000200023477300460025416135491995-06-27 1990 bl uuuu u00u1 u #d1 aVARVEL, G. E. aNitrogen fertilizer recovery by corn in monoculture and rotation systems. c1990 aMilho aNitrogênio aRotação de Cultura aSoja a15N21 aPETERSON, T. A. tAgron. J.gv. 82, n. 9, p. 935-938, 1990.