Browsing Journal of Range Management, Volume 35, Number 5 (September 1982) by Title
Now showing items 30-32 of 32
Use of Historical Yield Data to Forecast Range Herbage ProductionAn analysis of the 51-year herbage yield series from the Many-berries Range Experimental Farm in southeastern Alberta showed that there was a slight dependency between current year's herbage yield and previous year's yield. The analysis showed that the conditional probability of a below-average yield following a below-average yield year was about the same as the unconditional probability of having a below-average yield in any given year. The conditional probability of an above-average yield following a year with a below-average yield was significantly below the unconditional probability of having an above-average yield in any year. The probability of an above-average yield following a year with an above-average yield was significantly greater than the unconditional probability.
Waterponding for Increasing Soil Water on Arid RangelandsPonding dikes constructed to slow and control the overland flow of runoff water were evaluated. Infiltration and runoff measurements from a sprinkling infiltrometer indicated no differences between the control and the water ponding area. Examination of 20 years of precipitation records for June through September showed that enough ponding events occurred to supply an adequate amount of water for wetting the soil profile to below the plant rooting zone. The control areas were low in available soil water even immediately following precipitation events.
Wind Erosion Curtailed by Controlling MesquiteA sand-dune mesquite area with very little interdunal vegetation was treated aerially one to three times with 2,4,5-T at 0.56 kg/ha in an oil:water emulsion. Four and five years after the initial treatment, the amount of blowing soil was evaluated using sandtraps located at various distances from the boundary between sprayed and unsprayed mesquite. The amount of wind-blown particles was greatly reduced on the area chemically treated to control mesquite. During the windy season the amount of blowing soil in the unsprayed area was more than 15-fold greater than at 180 m into the sprayed area. Intermediate amounts were measured between the boundary and 180 m into the treated area.