• A Simple and Economical Root Washer

      Nyren, P. E.; Goetz, H.; Williams, D. E. (Society for Range Management, 1981-03-01)
    • Evaluation of a Fertilized 3-Pasture System Grazed by Yearling Steers

      Nyren, P. E.; Whitman, W. C.; Nelson, J. L.; Conlon, T. J. (Society for Range Management, 1983-05-01)
      A grazing trial comparing fertilized and unfertilized 3-pasture systems has shown that the addition of 56 kg nitrogen (N)/ha substantially improved forage and beef production. Forage production from the fertilized system was increased by 46% over the unfertilized system while per acre beef gains were increased 35%. Each 3-pasture system utilized crested wheatgrass for spring and early summer, native mixed grass prairie for mid and late summer and Russian wildrye for fall grazing. Comparison of Hereford and Angus-Hereford crossbreds indicated a slight gain advantage for the crossbred animals, although the increase was not statistically significant. The addition of the biuret supplement Kedlor was found to improve gains of steers grazing the native pastures in late summer but resulted in decreased gains on fall-grazed Russian wildrye pastures. Analysis of the forage samples showed that in all samples except one, the addition of N fertilizer increased the protein content.
    • Some effects of a white grub infestation on northern mixed-grass prairie

      Lura, C. L.; Nyren, P. E. (Society for Range Management, 1992-07-01)
      Graminoid standing crop in June 1985 on areas infested with white grubs (Phyllophaga anxia Leconte) (average density = 47 grubs m-2) was 92% less than on uninfested rangeland (average density < 2 grubs m-2). Study area was the Central Grasslands Research Center in south-central North Dakota. Infestations were noticeably associated with communities dominated by western snowberry (Symphoricarpos occidentalis Hook.) with an understory subdominance of Kentucky bluegrass (Poa pratensis L.). The objective of our study was to assess the initial impact and subsequent recovery of infestation on community standing crops and plant densities. Mid and late summer standing crops of Kentucky bluegrass and other grasses were significantly less (P < 0.05) on infested than uninfested sites between 1985 and 1987. Graminoid density was less (P < 0.05) on infested than uninfested sites during 1985 and 1986. Post-infested standing crop and density of forbs increased (P < 0.05) on infested sites. Infestation of sites subsequently provided habitat for establishment of noxious weeds such as wormwood sage (Artemisia absinthium L.). Management techniques to enhance the recovery of grasses and eliminate establishment of noxious weeds may be necessary.