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This article in AJ

  1. Vol. 65 No. 3, p. 511-512
     
    Received: Aug 14, 1972
    Published: May, 1973


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doi:10.2134/agronj1973.00021962006500030049x

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

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

Abstract

Abstract

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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