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- Yamoah, C.F.; Varvel, G.E.; Waltman, W.J.; Francis, C.A.
- Field crops research 1998 v.57 no.1 pp. 15
- Sorghum bicolor; Zea mays; Glycine max; Avena sativa; Trifolium pratense; Melilotus officinalis; nitrogen; continuous cropping; crop rotation; nitrogen fertilizers; rain; nitrogen fixation; nitrogen content; nitrates; soil water content; air temperature; seasonal variation; crop residues; crop yield; biomass; precipitation; application rate; grains; Nebraska
- ... Cropping systems, nitrogen (N) fertilizer levels, and climate largely dictate patterns of N use and influence problems arising from N fertilization. Nitrogen use was assessed in cropping systems with a nitrogen removal-index (NRI), defined as the ratio of N removed in the grain to total N supply including that from N fixation by legumes grown in rotation. Results are reported from analyses of NRIs ...