A "Coastal bermudagrass" (Cynodon dactylon L.) sod was treated during a five-year period with rates of N and K fertilizers ranging from none to high levels of both elements. In the spring of the sixth year differences in weed species and population densities among the treated plots were observed. Spring weed counts showed that high rates of N fertilizer reduced the number of weed species and the total broadleaf weed population density by 37 and 81%, respectively. The higher rates of K fertilizer also reduced the population density of common dandelion (Taraxacum officinale Weber) and yellow toadflax (Linaria vulgaris Hill),the two dominant broadleaf weed species. The grass weed population, predominantly crabgrass (Digitaria sanguinalis ,L. Scop.) was not affected significantly by either N or K fertilizer levels.
Allured, R. A.; Gordon, E. C.; Frans, R. E.; and Thompson, Lyell F.
"Residual Effects of N-K Fertilization of Coastal Bermudagrass on Spring Populations of Weed Species,"
Journal of the Arkansas Academy of Science: Vol. 28
, Article 5.
Available at: http://scholarworks.uark.edu/jaas/vol28/iss1/5