Nodulação e crescimento do feijoeiro em resposta à aplicação de molibdênio e inoculante rizobiano

Abstract

R E S U M OO feijoeiro (Phaseolus vulgaris) possui a capacidade de se beneficiar da fixação biológica de nitrogênio; entretanto, o sucesso deste processo é influenciado por diversos fatores. O objetivo deste trabalho foi dimensionar a magnitude da contribuição do molibdênio (fontes e doses) e rizóbios (nativos e introduzidos) para nodulação, acúmulo de nitrogênio e crescimento do feijoeiro IPR 139. O experimento foi realizado no ano de 2011 em casa de vegetação, no delineamento inteiramente casualizado em esquema fatorial 2 x 5 x 2 que, nas sementes, corresponde respectivamente à aplicação, de duas fontes (molibdato de sódio e molibdato de amônio) e cinco doses (0, 1, 2, 3 e 4 g kg -1 de sementes) de Mo na presença e ausência de inoculante rizobiano (Rhizobium tropici SEMIA 4088). As variáveis analisadas foram: massas da parte aérea seca, da raiz seca, total da planta seca, dos nódulos secos e média unitária de nódulos secos, número total de nódulos e nitrogênio total da parte aérea. Os resultados indicam o molibdato de amônio como a melhor fonte para elevar a massa de nódulos formados por rizóbios nativos, nas doses entre 2,0 e 3,0 g kgde sementes. A inoculação de R. tropici SEMIA 4088 não se mostrou eficiente para aumentar o crescimento de planta nem, tampouco, a nodulação e a fixação biológica de nitrogênio. Nodulation and growth of bean in response to application of molybdenum and rhizobia inoculation A B S T R A C TThe common bean (Phaseolus vulgaris) has the capacity to benefit from biological nitrogen fixation (FBN). However the success of this process is influenced by several factors. The aim of this study was to scale the magnitude of the contribution of molybdenum (sources and doses) and rhizobia (native and introduced) for nodulation, nitrogen accumulation and growth of IPR 139 bean. The experiment was conducted in 2011 in a greenhouse in a completely randomized factorial 2 x 5 x 2, corresponding respectively to the application in seeds from two sources (sodium molybdate and ammonium molybdate) and five doses of Mo (0, 1, 2, 3 and 4 g kg -1 seed) in the presence and absence of rhizobia inoculation (Rhizobium tropici SEMIA 4088). The variables analysed were: dry mass of shoot, root and total (shoot + root), dry nodules and average unit nodule, the total number of nodules and total nitrogen in aerial parts. The results indicate ammonium molybdate as the best source for raising the mass formed by indigenous rhizobia nodules, at doses between 2 and 3 g kg -1 seed. Inoculation of R. tropici SEMIA 4088 was not efficient to increase plant growth, nor nodulation and nitrogen fixation.

Prospecting of efficient rhizobia for peanut inoculation in a Planosol under different vegetation covers

“…Such variability in symbiotic system which has the ability of collections of rhizobia, is a result of high biodiversity of these microorganisms, associated with biotic and abiotic factors. Studies have shown that the symbiotic association is affected by several factors such as soil acidity, aluminum toxicity (Campanharo et al, 2010), salinity (Medeiros et al, 2008), low soil fertility (Sulieman and Tran, 2015), phosphorus and molybdenum deficiency (Matoso and Kusdra, 2014), high soil temperatures (Ferrari et al, 1967) and low water availability in the soil (Andres et al, 2012). The use of microsymbionts adapted to different environmental conditions, combined with the correction of factors related to soil fertility, which may potentiate the effects of inoculation with diazotrophic bacteria.…”

Chickpea production and soil chemical attributes after phosphorus and molybdenum fertilization

“…Bhuiyan et al (2008) and Togay, Togay and Dogan (2008a) obtained maximum seed yield and aboveground biomass production of mung bean and lentils, respectively, after using phosphorus application rates associated with molybdenum fertilization. Fertilization with P and Mo also had a positive effect on edible bean and soybean yield in areas of the Brazilian Cerrado (Araújo et al, 2009;Matoso;Kusdra, 2014;Vieira et al, 2016;Oliveira et al, 2017).…”

Nitrogen Fertilization and Inoculation of Seeds with Rhizobium tropici on the Agronomic Performance of Common Beans

“…These data show that the biological nitrogen fixation may supplement the nitrogen fertilization in the bean crop, allowing a reduction in nitrogen fertilizer rates, without losses in grain yield. Nevertheless, Matoso and Kusdra [16] did not find positive results regarding the inoculation of common bean with R. tropici.…”