Laserfiche WebLink
Table 2.04.10 -7 <br />Mean Woody Plant Density (Stems /Acre) For Irrigated Pasture <br />Vegetation Type, New Horizon 2 Study Area, 1987' <br />Species Stems /acre <br />Eleagnus angustifolia 0.5 <br />Juglans nigra2 0.1 <br />Acer negundo 0.1 <br />Rosa nutkana 5.3 <br />Ulmus pumila 0_1 <br />Total 6.1 <br />' Tree densities reflect absolute counts of species occurring in the irrigated pasture type <br />using color aerial photography (stereo pairs, 1 = 500' scale). The total tree estimate for the <br />irrigated pasture type was 947 trees. Populus sargentii and Populus angustifolia occasionally <br />occurred along irrigated pasture borders containing ditches but were not included in the <br />densities. <br />z Three Juglans nigra occurred in an irrigated pasture on the west side of the study area. <br />A total of 66 species were found to occur in the type (Attachment 2.04.10 -6, formerly Peabody <br />10 -1), with 21 of those species encountered in the cover sampling. Only 12 of these species <br />had relative cover values of 1 percent or greater. Of these 12 species, 8 were graminoids and <br />four were forbs. Though this represents a low level of diversity for native plant communities, <br />irrigated pastures that are in good condition and well managed should have a composition of <br />only a few species (Stewart 1973). <br />The general stocking rate for the irrigated pasture is approximately 1.2 AVM's /acre at a 70 <br />percent utilization rate. Since the production on these pastures can be sustained by irrigation, <br />this stocking rate should apply during the majority of the growing season. Ideally, the forage <br />should achieve a 4 -5 inch height in the spring and between pasture recovery periods before <br />grazing with allowance for a 4 -5 inch stubble height of vegetation remaining at the end of the <br />August 2013 (PR 08) 2.04.10 -32 <br />