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This article in SSSAJ

  1. Vol. 33 No. 6, p. 962-966
     
    Received: Apr 14, 1969
    Published: Nov, 1969


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doi:10.2136/sssaj1969.03615995003300060044x

Response of Bitterbrush Seedlings to Nitrogen and Moisture on a Granitic Soil1

  1. J. O. Klemmedson and
  2. R. B. Ferguson2

Abstract

Abstract

Greenhouse studies were conducted to explore the influence of nitrogen and moisture on seedlings of bitterbrush (Purshia tridentata [Pursh] DC.), when grown in soil from three different layers. Seedlings were grown in pots in granitic soil collected from 0–15-, 15–40-, and 40–90-cm soil layers with three nitrogen (N) treatments (0, 34, and 100 kg/ha) and low and high moisture regimes. Shoot and root weights of seedlings grown in surface soils without added N greatly exceeded those for seedlings grown in soil from lower layers. Added N caused seedling yields to decline on surface soils but to increase on the 40–90-cm soil layer. Maintenance of a high moisture regime diminished the adverse effects of added N on seedlings grown in soil from the surface layer, but improved its effectiveness on seedlings grown in lower layer soils. Shoot-root ratios and efficiency of water use by bitterbrush differed with respect to N and soil layer treatments. In subsequent experiments, six granitic soils (including the previously tested soil) proved deficient in N for barley. However, on the same soils, bitter-brush responded negatively or gave no response to added N. The experiments showed that yields of bitterbrush declined when N in plants reached about 2.0%.

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