• Effect of Planting Depth on Seedling Growth of Russian Wildrye (Elymus junceus Fisch.)

      McGinnies, W. J. (Society for Range Management, 1974-07-01)
      Planting depth of Russian wildrye (Elymus junceus Fisch.) influenced seedling growth during the seedling year. In field plantings over 4 years at two locations, plants from 2.5- and 3.8-cm planting depths were significantly taller than plants from the 1.3-cm depth. In greenhouse plantings, plants from 3.8-cm planting depth were consistently taller than plants from the 1.3-cm depth, but the plants from the 1.3-cm depth generally produced more tillers. Transplants with crowns set 1.3 cm deep produced more tillers than those with crowns set 3.8 cm deep. Depth of transplanting had no effect on height of plants. The height difference between plants planted at different depths apparently resulted from some form of seedling selection at greater depths, but the number of tillers probably was determined by crown depth alone. Grass breeders using planting depth to evaluate seedling vigor may be inadvertently selecting for taller plants. Weight per plant tended to be higher for the 1.3-cm planting depth than for the 3.8-cm depth, but this effect was not consistent.
    • Evaluation of Methods for Screening Grasses for Resistance to Grasshopper Feeding

      Hewitt, G. B.; Blickenstaff, C. C. (Society for Range Management, 1974-07-01)
      A study was initiated to find a rapid method of screening forage plant selections for grasshopper preference. Six grass species both as seedlings and as plants 6 weeks older were fed to nymphs and/or adults of five grasshopper species and one group of nymphs of mixed species. It was concluded that it is feasible to screen plant species in the seedling stage for preference by using grasshopper nymphs because the nymphs selected plant species of both ages equally well and their preferences were similar to those of adults. This allows for more rapid screening of plants than would be the case with older plants and adult grasshoppers.
    • Variation in Pinehill Bluestem, a Southern Ecotype of the Andropogon scoparius Complex

      Grelen, H. E. (Society for Range Management, 1974-07-01)
      Pinehill bluestem is the most common variant of the little bluestem (Andropogon scoparius) complex in pine forests of north and central Louisiana and east Texas. It is also frequent in adjacent portions of Oklahoma and Arkansas. It differs from other inland forms of little bluestem primarily in its unreduced pedicellate spikelets, which are equal in size to the sessile spikelets. Because of vegetative similarity between pinehill bluestem and associated forms of A. scoparius, separation of varieties for purposes of forage management is not recommended.
    • Seedling Emergence and Survival from Different Seasons and Rates of Seeding Mountain Rangelands

      Hull, A. C. (Society for Range Management, 1974-07-01)
      At a mountain rangeland site in southeastern Idaho, a mixture of five grasses was drilled at 10 and 25 lb/acre at six seasons each year for 4 years. The 25-lb rate produced significantly more seedlings than the 10-lb rate, but 10 lb was slightly more efficient in producing seedlings. Seedling survival was best from seeding in June, followed closely by July 1 and then November 1, October 1, September 1, and August 1. As an average of both seeding rates, per 100 seeds of the mixture planted in June, 12 plants emerged, five were alive at the end of 1 year, and two at the end of 3 years. At each planting time, intermediate wheatgrass seed was placed between nylon strips in the soil to determine the fate of the seeds. For 100 seeds of intermediate wheatgrass in nylon strips in June, 84 germinated, 30 plants emerged, and 12 were alive at the end of 1 year.