Abstract
ABSTRACT: Optimization of symbiosis between nitrogen-fixing bacteria and legumes has been extensively studied, seeking agricultural sustainability. To evaluate the symbiotic efficiency of nitrogen-fixing bacterial strains belonging to the Bradyrhizobium genus with pigeon pea (Cajanus cajan (L.) Millsp.) cv. Fava-Larga, experiments were conducted in Leonard jars (axenic conditions), pots with soil, and in the field. Ten strains were tested in Leonard jars, and three strains, in addition to BR 29, were selected according to their ability to promote the growth of [...]
Highlights
Nitrogen (N) is one of the most important nutrients for plants, and one of the most limiting for agricultural production in the tropics
Three experiments were carried out to evaluate the symbiotic efficiency of Bradyrhizobium strains with pigeon pea (Cajanus cajans (L.) Millsp.): one in the axenic conditions of Leonard jars (Vincent, 1970), one in pots with soil, and one under field conditions
In periods pre-determined for each experiment, the following parameters were evaluated: plant height, number of nodules (NN), nodule dry matter (NDM), shoot fresh matter (SFM), root dry matter (RDM), shoot dry mater (SDM), nitrogen (N) content in the shoot (NCS), and N accumulation in the shoot (NAS)
Summary
Nitrogen (N) is one of the most important nutrients for plants, and one of the most limiting for agricultural production in the tropics. Pigeon pea [Cajanus cajan (L.) Millsp.] is a Fabaceae that benefits from BNF, obtaining most of the N required for its development from this process This was confirmed by experiments in axenic conditions (Fernandes and Fernandes, 2000; Fernandes et al, 2003; Martins et al, 2012), in pots with soil (La Favre and Focht, 1983; Valarini and Godoy, 1994; Sanginga et al, 1996; Paz et al, 2000), or under field conditions (Espanã et al, 2006; Ahmed et al, 2014; Rufini et al, 2014b). It can be grown in depleted soils, and can serve as a means of soil fertilization for subsequent crops by the BNF process (Osman et al, 2011)
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