Arkansas - Agricultural Communication Services - University of ...

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).
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