Abstract
Plant breeding with low N fertilizer levels has now been shown to be the key to the high contributions of biological dinitrogen fixation (BNF) to graminaceous plants. Due to historically high prices of N fertilizers in Brazil, cereals, forage grasses and especially sugar cane have been bred, or selected, for decades with very low N fertilizer levels, and with this involuntarily, for BNF. During the last two decades nitrogen balance experiments with rice (App et al., 1980; App et al., 1984; Ito et al., 1980), 15N2 incorporation (De-Polli et al., 1977) and 15N dilution experiments with forage grasses (Boddey, Victoria 1986; Miranda, Boddey 1987) and rice (Urquiaga et al., 1991) clearly showed that in certain genotypes substantial contributions of BNF can be obtained. Recent experiments using N balance (Lima et al., 1987) and the 15N dilution method with various sugar cane genotypes, showed that this crop can obtain more than 60% of its nitrogen needs from BNF under field conditions (Urquiaga et al., 1992). Most sugar cane cultivars in this experiment grown in an extremely N deficient subsoil (0.08% total N) irrigated and fertilized with PK and minor elements alone, produced yields more then twice the Brazilian average (60 t.ha-1) in three consecutive harvests. The two most outstanding cultivars CB45-3 and SP 70–1143 produced 244 and 182 t.ha-1, yr-1 respectively obtaining 154 and 134 kg N.ha-1.yr-1 from BNF (means of three harvests).
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© 1993 Springer Science+Business Media Dordrecht
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Döbereiner, J., Reis, V.M., Paula, M.A., Olivares, F. (1993). Endophytic Diazotrophs in Sugar Cane, Cereals and Tuber Plants. In: Palacios, R., Mora, J., Newton, W.E. (eds) New Horizons in Nitrogen Fixation. Current Plant Science and Biotechnology in Agriculture, vol 17. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-2416-6_55
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DOI: https://doi.org/10.1007/978-94-017-2416-6_55
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