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Arkansas Animal Science Department Report 2001 vested May 18. Weather data was collected from a weather station several hundred yards from the plots. Experimental design was a randomized complete block with four replications and a split plot over time treatment arrangement. Legume cultivar was the main plot and was tested for significance using block x cultivar as the error term. Harvest year was the subplot. Cultivar by harvest year interactions were highly significant (P < 0.001) for all variables. Therefore, varieties were compared separately for each harvest year. Fisher’s protected LSD (P
AAES Research Series 488 (Oenothera laciniata Hill), and Virginia pepperweed (Lepidum virginicum L.). In the reseeding year, weed yield did not differ across cultivars (P = 0.11). Across both years, legume yield was negatively correlated with weed yield r = -0.46; P < 0.001). Weed yield on balansa clover plots was higher (P < 0.05) and on rose clover plots tended (P < 0.08) to be higher in the reseeding year than in the planting year, probably because stands were thinner during the reseeding year. Denmark subclover was the only legume that suppressed (P < 0.05) weed yield in the reseeding year compared to the planted year. Ability of legumes to compete with broadleaf weeds will be a factor in local adaptability because there are no currently labeled herbicides that will kill the weeds. Competitiveness with weeds may also reflect ability of legumes to coexist with desirable grasses in mixed swards. Cold tolerance of persian clover may be questionable in a very cold winter, but reseeding is excellent. Black medic failed to reseed in this trial. Acknowledgments We thank Kaufman and Kamprath Seed Companies and Texas A&M University for providing the seed used in this study. Literature Cited Ball, D.M., et al. 1996. Southern Forages. 2nd Edition. Potash and Phosphate Institute, Norcross, GA. Implications Balansa, rose, and subterranean clovers, and burr and button medics have met minimum criteria of winter survival and reseeding ability under southwest Arkansas conditions. Table 1. Dry matter yield of annual legumes and weeds after planting of legumes (year 1) and natural reseeding (year 2) in Hope, Arkansas. Legume yield (lb DM a /acre) Weed yield (lb DM/acre) year b year year b year Species/cultivar Year 1 Year 2 P < CV a Year 1 Year 2 P < CV a Subterranean Clover Denmark 1273 1227 NS a 23.1 1568 514 0.05 40.9 Goulburn 1352 1101 NS 28.2 1204 894 NS 80.0 Burr Medic Armadillo 612 43 0.05 64.0 885 1150 NS 32.1 BECOM 2852 57 0.05 55.4 1036 1234 NS 61.5 Button Medic 3300 265 0.01 34.1 820 1358 NS 25.4 Black Medic George 2080 78 0.05 63.7 1720 1604 NS 29.2 BEBLK 1253 28 0.01 33.7 904 730 NS 30.5 Balansa Clover Paradana 3657 839 0.01 29.4 267 780 0.01 22.9 Rose Clover Overton R18 5610 2450 0.01 5.9 108 1056 0.08 83.4 Persian Clover Nitro 1836 347 0.05 37.9 500 947 NS 71.0 LSD a (0.05) c 953 443 857 NS Cultivar CV a 27.6 47.4 65.4 46.2 a DM=dry matter, CV=coefficient of variation, NS=not significant, LSD=least significant difference. b Probability of a significant difference between year 1 and year 2. c Cultivar means within columns are different (P < 0.05) when the difference between cultivars is greater than or equal to the LSD value (Fisher’s protected LSD, P < 0.05). 143
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Arkansas Animal Science Department
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spine copy ARKANSAS ANIMAL SCIENCE
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INTRODUCTION The faculty and staff
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COMMON ABBREVIATIONS Abbreviation T
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The Effects of Nitrogen Fertilizati
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Demographics and Academic Success o
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Efficacy of Mannan Oligosaccharide
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Effects of Dietary Magnesium and Ha
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Effect of Feather Meal on Live Anim
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Maternal Effects for Performance Te
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Supplementation of Beef Cows and He
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Influence of Supplementing Cobalt i
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Long-Term Immune Response of Beef H
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Small Grain Forage for Stocker Catt
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