Study of the association Gluconacetobacter diazotrophicus-tropical tubers and roots. Effect on performance under extension conditions
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Abstract
In order to evaluate the effect of G. diazotrophicus application on the yield of tropical tubers and roots, under extension conditions, the INIFAT Abn-1 strain of the microorganism was inoculated in sweet potato, cassava and taro, during two production campaigns. At the end of the crop cycle in the inoculated sweet potato plants, the growth indicators increased between 30 and 60 %, with a yield of 13 t ha-1 more in the plots applied in relation to controls. In the case of cassava, the growth indicators increased with the application of microorganism between 36-48 % and the yield by 40 %, with the obtaining of 17 t ha-1 more in applied plots; while for taro, the growth indicators increased between 58 and 94 % in the inoculated plots and the yield increased by 40 and 58 % in each campaign, respectively. The concentration of G. diazotrophicus in leaves of the three cultures ranged between 103 and 107 CFU per gram of fresh tissue and it was between two and four orders lower in the control plants than in the inoculated ones. The work demonstrated the growth stimulating effect of G. diazotrophicus in sweet potato, cassava and taro under production conditions, the need to inoculate the microorganism to increase its autochthonous population in these crops, as well as the possibilities of using the endophytic bacteria in the agronomic management of these plant species.
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