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- [29] RECOVERY OF RESIDUAL NITROGEN BY CORN (ZEA-MAYS L) FROM VARIOUS SOIL DEPTHS AS MEASURED BY N-15 TRACER TECHNIQUES SOIL SCIENCE SOCIETY OF AMERICA PROCEEDINGS, 1971, 35 (02): : 290 - &
- [30] Effect of fertilization on organic and microbial biomass nitrogen using N-15 under corn (Zea mays L) in two Quebec soils FERTILIZER RESEARCH, 1996, 44 (02): : 143 - 149