SYMBIOTIC EFFECTIVENESS AND COMPETITIVENESS OF CALOPO RHIZOBIAL ISOLATES IN AN ARGISSOLO VERMELHO-AMARELO UNDER THREE VEGETATION COVERS IN THE DRY FOREST ZONE OF PERNAMBUCO

Revista Brasileira de Ciência do Solo

Altanys Silva Calheiros¹  Mario De Andrade Lira Junior¹  Mércia Virgínia Ferreira Santos¹  Maria Do Carmo Catanho Pereira Lyra¹ 

关键词: Calopogonium mucunoides;    biological fixation;    forage legumes;    Calopogonium mucunoides;    fixação biológica;    leguminosas forrageiras;   

DOI  :  10.1590/01000683rbcs20140393

来源: SciELO

【 摘 要 】

Biological N fixation in forage legumes is an important alternative to reduce pasture degradation, and is strongly influenced by the inoculant symbiotic capability. This paper evaluates the effectiveness of Calopo (Calopogonium mucunoides) rhizobial isolated from soil under three vegetation covers of an Argissolo Vermelho-Amarelo of the Dry Forest Zone of Pernambuco. An experiment was conducted evaluating 25 isolates, aside from 5 uninoculated controls with 0; 309; 60; 90 and 120 kg ha-1 N, and a treatment inoculated with the SEMIA 6152 strain. The first cut was performed 45 days after inoculation and a second and third cut after 45-day-intervals. Shoot N content was quantified at all cuts. Shoot dry mass was affected by N rates at all cuts. Shoot dry mass increased from the first to the second cut in inoculated plants. There was no difference between rhizobial isolates from the different plant covers for any of the variables. Most variables were significantly and positively correlated.

【 授权许可】

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