Desenvolvimento inicial de gramíneas forrageiras inoculadas com bactérias diazotróficas

Abstract

Meat production in the country is based on pasture-fed cattle, and for this reason, there is growing interest in new alternatives that can enhance the productivity of grasses, such as the use of inoculants containing plant growth-promoting bacteria. This study aims to evaluate the influence of inoculation with the strains Azospirillum brasilense (ABV5 and HM053), Azospirillum sp. (L40), Azospirillum lipoferum (Sp59), and Herbaspirillum seropedicae (SMR1) on the initial development of forage grasses Brachiaria brizantha BRS Piatã, Panicum maximum BRS Zuri, and Panicum maximum BRS Quênia. For B. brizantha, a completely randomized design (DIC) was used, consisting of six treatments — five bacteria and a control — with three replications. For the Panicum genus, a DIC in a 6x2 factorial scheme was used, consisting of five bacteria plus a control × two Panicum varieties, with three replications. The evaluated parameters were: root length, shoot length, secondary root, fresh root mass, dry root mass, fresh shoot mass, and dry shoot mass.The bacteria that showed the best results for B. brizantha BRS Piatã were Herbaspirillum seropedicae (SMR1), Azospirillum brasilense (HM053), and Azospirillum lipoferum (Sp59). For the Panicum varieties, there was no significant interaction, nor for the bacterial factor, only for the cultivar factor. The cultivar Panicum maximum BRS Zuri showed better results for the analyzed variables, being superior to Panicum maximum BRS Quênia.