Assessment of N-2 fixation by three forage peanut ecotypes using N-15 natural abundance technique
Por:
de la Mora, BV, Cadisch, G
Publicada:
1 abr 2010
Resumen:
The percentage of nitrogen derived from N-2 fixation was measured by the N-15 natural abundance method, in three Arachis pintoi (Ap) ecotypes: CIAT 17434, 18744 and 18748, using an improved Bradyrhizobium strain CIAT 3101 (BS), and a mixing of native strains (NS). As reference plants, a non-nodulating Arachis hypogaea, Brachiaria arrecta, B. brizatttha and Cytiodon nlemfuensis were used. The experiment was set up under greenhouse conditions, and five harvests were done. Dry matter yield was highest in Ap ecotypes and BS (98.3 +/- 10.0 g pot(-1)), vs plants with NS (19.9 +/- 1.4 g pot(-1)). Values of delta (delta) N-15 in the ecotypes 17434, 18744 and 18748 were, 8.4, 5.7, 7.7 Too, and 1.2, 1.0 and 3.5 Tov for NS and BS, revealing for the later group more N-2 dependence to grow. All reference plants showed positive effects of the BS on the percentage of N-2 fixed: 92.7 +/- 1.8 vs 6.5 +/- 7.6 with ecotypes inoculated with NS. It was concluded that the N-2 fixed was highly dependent of th
Filiaciones:
de la Mora, BV:
Univ Nacl Autonoma Mexico, Fac Med Vet & Zootecnia, Ctr Ensenanza Invest & Extens Ganaderia Trop, Martinez De La Torre 93600, Veracruz, Mexico
Cadisch, G:
Univ Hohenheim, Inst Plant Prod & Agroecol Trop & Subtrop, D-7000 Stuttgart, Germany
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