Laserfiche WebLink
thistle abundant in October, Mulch Irad no influence on emergence of <br />seeded species. The application of phosphorous slightly improved the <br />emergence of seeded species, while imprinting had a negative <br />influence. It was recognized in 1984, that the pipeline had been <br />previously seeded with crested wheatgrass, and these plants are hard <br />to distinguish from the seeded species. <br />Based on the 1985 information for plants values (density x vigor), <br />there was no significant difference between seed mixtures A, B, and C <br />(P greater than 0.10). Plant values were significantly (P equals <br />0.10) lower on plots with imprinting. Neither mulch nor phosphorus <br />had an affect on plant values. Both Brominal and Glean treatments <br />had significantly (P less than 0.01) higher plant values than when no <br />herbicide was used. Brominal and Glean were not significantly <br />different. However, early Glean produced significantly (P less than <br />O.U1) more plant values than late Glean. <br />In 1985, significantly more weeds (blue mustard plus cheatgrass) were <br />found in seed mixture C than mixtures A or B. Mixtures A and B were <br />not different. Imprinting appeared to make no difference in weed <br />abundance, except for an interaction between imprinting and seed <br />mixtures. Mulched and phosphorus treated plots had significantly (P <br />less than 0.01) mare weeds than plots without these treatments. <br />Herbicides (Brominal and Glean) significantly reduced the aoundance <br />of weeds. Glean plots lead significantly fewer weeds than Brominal <br />plots. The application of Glean early or late showed no difference. <br />Two significant interactions were observed; one between mulch and <br />herbicide (P less than 0.01) and the other between mulch phosphorus <br />and herbicides (P less than 0.01). <br />Plant values almost doubled from 1986 to 1987 and were significant (P <br />equals 0.01, Table 5). Table 6 presents the data for treatment <br />combinations. Plant values were not significantly different between <br />replications in 1986 or 1987. Plant values for seed mixture B are <br />significantly better than for either seed mix A or C (P equals 0.01) <br />in both 1986 and 1987. Tile rhizomatous wheatgrasses ('Arriba' and <br />'Critana') are primarily responsible for the success of seed mix B. <br />Seed mixtures A and C are not significantly different from each other <br />for 1986 and 1987 (P greater than 0.10). <br />The most promising species for each of the seed mixtures are listed <br />in Table 7. For seed mixture A in 1987, the most promising species <br />were 'Solar' and 'Secar'. For seed mixture B, 'Arriba' and 'Critana' <br />were the best preformers, while in seed mixture C the most promising <br />were 'Siberian' wheatgrass and 'Rosana'. <br />There was no significant difference in plant values between the <br />imprinted and nonimprinted plots for either 1986 or 1987 (P greater <br />than 0.10). However, imprinting initially aided weedy species <br />establishment in 1984. <br />There were significantly more plants on the plots without mulch than <br />on those with mulch in both 1986 and 1981 (P equals 0.10). <br />6 <br />