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Agronomy Journal Abstract -

Effects of Fertilizer on Root Strength of Sherman Big Bluegrass (Poa ampla Merr.)1


This article in AJ

  1. Vol. 65 No. 3, p. 511-512
    Received: Aug 14, 1972

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  1. M. R. Haferkamp and
  2. P. O. Currie2



Pulling of plants by .grazing animals has been a common problem on ‘Sherman%#x2019; big bluegrass (Poa ampla Merr.) pastures in Colorado. Fertilizers were applied to individual plants in a greenhouse study to evaluate their influence on plant resistance to pullup. The fertilizer treatments were 56 kg/ha N, 56 kg/ha P, or 56 kg/ha of each element as an N+P combination. Fertilizer treatments were applied to vernalized and nonvernalized plants grown in two soils.

Tensions required for pullup in the greenhouse were correlated with total root weight (r = .75**) and significantly increased with N fertilization. Plants fertilized with N produced more vegetative and reproductive shoots, tillers, foliage weight, and root system weight and length. Phosphorus fertilization produced a significant increase in vegetative and reproductive shoots, and a significant interaction between N and P was found for root system size and the amount of roots that were pulled from the soil with the plants.

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