00531     2200157   4500001002100000008004100021035002000062245012400082100003400206084001800240520004600258082001100304650002500315650001800340990001500358INLIS000000000002730                                   Ind    a0010-1118002730  aA comparison of the isotope recovery and difference methods for determining nitrogen fertilizer efficiencycHARMSEN, K.  aK. Harmsen and J.T. Moraghan.  aBr.631.84HARc  aRepr. from : Plant Soil, 105(1988):55-67.  a631.84  aNITROGEN FERTILIZERS  aRADIOISOTOPES  a1330/MS/88