Browsing Journal of Range Management, Volume 25, Number 1 (January 1973) by Authors
Nitrate-Nitrogen Accumulation in Range Plants after Massive N Fertilization on Shortgrass PlainsHouston, W. R.; Sabatka, L. D.; Hyder, D. N. (Society for Range Management, 1973-01-01)Following massive nitrogen (N) fertilization, at rates of 224, 448, and 672 kg N/ha applied in April 1969, nitrate accumulation by species and plant groups on mixed-grass prairie was measured for 3 years. All species and plant groups accumulated Nitrate-N in direct relation to rates of applied N. Two annual forbs accumulated nitrate-N above the 2000 ppm level, which is considered toxic to livestock. In 1970, the first year of residual effect, slimleaf goosefoot contained nitrate-N levels two to three times higher than the potentially toxic level, and in 1971 greenflower pepperweed contained nitrate-N levels slightly above the potentially toxic level. The use of massive rates of N as a range improvement practice should be used with caution unless potentially toxic species are controlled.