Above- and below-ground responses of Eragrostis and Bouteloua grass seedlings to the plant-growth-promoting bacterium Azospirillium brasilense

Arias, Hector O Rubio
Wood, M Karl
Nieto, Carlos Morales
Lopez, Gerardo Reyes
de la Vega, Lourdes
Journal of Arid Environments
Publication Year: 
Two experiments were performed to determine the effects of inoculation with N2 fixing bacterium Azospirillum brasilense on forage production and root growth in seedlings of Wilman lovegrass, weeping lovegrass, and sideoats grama. Two sources of inorganic nitrogen (N) were tested: Urea, CO(NH2)2 (45%) and ammonium nitrate NH4NO3 (33.3%). Crude protein (CP), calcium (Ca) and phosphorous (P) concentrations were determined. In both experiments top dry matter (DM) production was significantly affected for grasses and inoculation but no differences were found for inorganic nitrogen applications. Maximum amount of top DM was obtained with the Wilman lovegrass with 5.70 160;g, weeping lovegrass reached 2.70 160;g, and sideoats grama only reached 1.58 160;g. Inoculated treatments reached 3.37 160;g while the no-inoculated treatments obtained 2.74 160;g. A similar trend was also noted for root phytomass. CP, Ca and P concentrations for the first experiment did not show any trend; therefore, they were not determined for the second experiment. Inoculation of grasses with A. brasilense may be a feasible practice for seeding some rangeland where N deficiency is a problem.
Name of Journal: 
Journal of Arid Environments
Resource Type: 
Document Type: 
Journal Issue/Article
Grassland Society of Southern Africa

The Grassland Society of Southern Africa (GSSA) is involved and concerned with the science and practice of range and pasture management. This broad field involves primarily the use and conservation of natural resources. It encompasses applied fields such as livestock production, wildlife management, nature conservation, water catchment management and range and mine-dump rehabilitation. The disciplines include, amongst others, ecology, botany zoology, range and pasture science, animal science, soil science and genetics. This collection includes journal articles from the African Journal of Range and Forage Science as well as related articles and reports from throughout the Southern African region.