Nitrogen and Phosphorus Effects on Blue Grama and Buffalograss Interactions
Journal of range management
Soii water availability and soil texture appear to influence the relative distribution of blue grama [Boufeloua gracilis (H.B.K.) Lag.] and buffalagrass [Buddoe ducf@ides (Nutt.) Engelman]. However, nutrient gradients may airect competitive interactions where the species occur together and may influence revegetation efforts in abandoned croplands. A greenhouse esperiment was conducted to test whether competition between species was prevalent under relatively nutrient-rich vs. nutrient-poor
... nutrient-poor conditions. Blue grama and buffalograss plants were groom in intraand interspecific pairs under 4 nutrient regimes representing ccmbinatitions of low and high availabilities of nitrogen (N) and pho-@xws (P). Interspecific competition was evident only with high N and P availability. Blue grama exhibited greater aboveground b'romass, increased tiller production and higher N and P contents when graxm in mixture, compared to monocultures. This was accompanied nith a reduction in tiller production and bdowgronnd P content in buffalograss groom in mixture. Stolen production in buf'falograss was prevalent only with high P. Blue grama had greater biomass than buffalograss regardless of nutrient treatment. Blue grama appears to be more competitive than bnffa@rass with high nutrient availability and more stress tolerant trith 10-w fertility.