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Fiaure .5% Pof applied N released from <br /> selected nitrogen sources € ver 189 day soil incubation <br /> 10 <br /> 0 SO, <br /> . a <br /> 8 <br /> POLYON <br /> 70 <br /> . 60 <br /> %do <br /> 40 <br /> IBDI <br /> v <br /> .� v <br /> N I ROFORM <br /> r <br /> 2 <br /> rr <br /> d <br /> A <br /> 1 28 �9 4 <br /> ¢' <br />