Yield responses of Nepalese spring wheat (Triticum aestivum L.) cultivars to inoculation with Azospirillum spp. of Nepalese origin

Abstract

Azosprilla were collected in wheat fields from subtropical and temperate soils of central Nepal at various elevations. Different wheat cultivars responded positively and significantly in grain yield, grain N-yield, and total N-yield in plant shoots to the inoculation with Nepalese isolate Azospirillum 10SW. Nepalese wheat cv. Seto responded significantly better with Azospirillum 10SW than with the Brasilian isolate A. lipoferum Sp 108 st, a strain which was found highly efficient in earlier experiments with German wheat cultiyars, especially cv. Turbo. Yield of Turbo was increased by inoculations of both Azospirillum strains too, but it showed no significant differences depending from the inoculum used. The higher efficacy of combining Azospirillum 10SW and Seto, both collected from the same locality, indicates the possibility of improved associations using traditional cultivars and local bacteria.

Growth and yield response of spring wheat (Triticum aestivum L.) to inoculation with rhizobacteria

“…(Kennedy andTchan 1992, Döbereiner 1997). Enhancement of crop yields of cereals by inoculation with nitrogen fixing bacteria was observed in many experiments (Bhattarai and Hess 1993, Cakmakci et al 2001, Ozturk et al 2003. Yield increases obtained in inoculated plants were attributed to the production of plant growth substances by the root-colonizing bacteria (Kennedy and Tchan 1992).…”

“…Yield increases obtained in inoculated plants were attributed to the production of plant growth substances by the root-colonizing bacteria (Kennedy and Tchan 1992). Promotion of root growth resulted in enhanced nutrient and water uptake from the soil (Okon 1984, Bhattarai andHess 1993). Inoculation of wheat with Azospirillum sp.…”

“…Inoculation of wheat with Azospirillum sp. increased root dry weight and 1000-kernel weight ( Jagnow 1990), raised number of spikes per plant, number of grains per spike and grain and straw yield (Darmwall andGaur 1988, Ozturk et al 2003), N-uptake and N-yield (Bhattarai and Hess 1993) in wheat. Inoculation of Bacillus sp.…”

“…Yield responses of cereals to inoculation with rhizobacteria depend on plant genotype (Murty and Ladha 1988), bacterial strain and soil type (Baldani et al 1987) as well as environmental conditions (Bhattarai and Hess 1993). As diazotrophic bacteria are widely distributed, it is possible that many diazotrophs, possibly including the most efficient one, have not been identified yet (Döbereiner 1988).…”

Absorption efficiency of N, P, K through triple inoculation of wheat (Triticum aestivum L.) by Azospirillum brasilense, Streptomyces sp., Glomus intraradices and manure application

“…In this association, the bacterium fixes air nitrogen and produces plant growth promoters (Bashan and Levanony 1990;Dobereinea 1989;Elmerich 1986;Patriquin et al 1983). Although the genus Azospirillum has five species, but most strains are from A. brasilense, which mostly associate with C3 cereals, and from A. lipoferum, which mostly associate with C4 cereals (Bashan and Levanony 1990;Bhattarai and Hess 1993;Elmerich et al 1992).…”