The influence of domestic ryegrass and redtop upon the growth of Kentucky bluegrass and chewing's fescue in lawn and turf mixtures
1947
Erdmann, M.H. | Harrison, C.M.
1. In pure cultures, either domestic ryegrass or redtop made much greater growth than Kentucky bluegrass or Chewing's fescue. Domestic ryegrass produced the greatest growth of the four grasses. 2. In mixtures, both domestic ryegrass and redtop inhibited the growth of Kentucky bluegrass and Chewing's fescue. 3. Domestic ryegrass and redtop dominated in mixtures in which they made up 20% or more of the weight of seed planted. 4. The dominance of domestic ryegrass and redtop over Kentucky bluegrass and Chewing's fescue did not diminish with time. 5. Kentucky bluegrass and Chewing's fescue did not compete with each other, but neither did their production increase when in mixture together. 6. Increasing, or decreasing, the rate of seeding of domestic ryegrass had little effect upon the weight of the tops and roots harvested. 7. Increasing the rate of seeding of redtop or of Chewing's fescue increased the weight of the tops and roots harvested. 8. Doubling the rate of seeding of Kentucky bluegrass in mixtures did not consistently increase production. 9. Where quick cover is not essential, sowing an adapted, desired turf grass alone would result in a more satisfactory turf than a mixture which includes the coarser, more aggressive nurse grasses.
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