+ Site Statistics
+ Search Articles
+ Subscribe to Site Feeds
EurekaMag Most Shared ContentMost Shared
EurekaMag PDF Full Text ContentPDF Full Text
+ PDF Full Text
Request PDF Full TextRequest PDF Full Text
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on LinkedInFollow on LinkedIn

+ Translate

Atrazine, bifenox, and shade effects on crownvetch (Coronilla varia) nodulation and nodule activity

Atrazine, bifenox, and shade effects on crownvetch (Coronilla varia) nodulation and nodule activity

Weed Science 36(4): 535-539

Studies were conducted to determine whether photosynthesis-inhibiting herbicides atrazine or bifenox, and shade affect the number, weight senescence, and N fixation activity of nodules on the roots of the perennial legume crownvetch. Atrazine and bifenox were applied at rates of 2.24 kg ai/ha to shaded and unshaded plots. The shade was varied during the growing season to simulate changing irradiance levels beneath a corn canopy. Atrazine and bifenox treatments reduced nodule number to 13 and 42% of the untreated control, respectively, in 1980, and 18 and 35% in 1981. Shade treatments reduced nodule number to a low of 40% of the control in 1980 and 50% in 1981. Combined effects of herbicides and shade on nodule numbers were more than additive. Nodule fresh weights were reduced an average of 37% by herbicide treatments and 39% by shade treatments. Sloughed nodule numbers decreased in the herbicide and shaded treatments, suggesting that the reduction in nodule numbers was due to fewer nodules being produced. Nodule numbers were reduced a greater percentage by herbicides and shade than was herbage dry matter production. Specific nodule activity (SNA) did not differ in nodules from the atrazine, bifenox, or shade treatments on the six sampling dates in 1980 or on two treatments of three sampling dates in 1981. Nomenclature: Atrazine, 6-chloro-N-ethyl-N'-(methylethyl)-1,3,5-triazine-2,4-diamine; bifenox, methyl 5-(2,4-dichlorophenoxy)-2-nitrobenzoate; crownvetch, Coronilla varia L.

(PDF emailed within 0-6 h: $19.90)

Accession: 001533598

Download citation: RISBibTeXText

DOI: 10.2307/4044681

Related references

Herbicidal effects on crownvetch coronilla varia rhizobia and nodule activity. Weed Science 34(3): 338-343, 1986

Comparison of the effects of crownvetch (Coronilla varia L.) and alfalfa hays on the liveweight gain of sheep. Agron. J, 61: 2, 187-90. Bibl. 17, 1969

Comparison of the effects of crownvetch d coronilla varia d and alfalfa d hays on the live weight gain of sheep. Agronomy Journal 61(2): 187-190, 1969

1. Morphological development and physiology of crownvetch (Coronilla varia L.) as influenced by defoliation intensity and 2. Net carbon exchange of crownvetch leaves as influenced by light and temperature. Dissertation Abstracts International, B 35(2): 643, 1974

'G34' Crownvetch (Coronilla varia L.). New Zealand Journal of Agricultural Research 48(1): 125-126, 2005

Environmental and plant growth stage effects on composition and digestibility of crownvetch coronilla varia stems and leaves. Agronomy Journal 73(1): 122-128, 1981

Crownvetch (Coronilla varia L.) in Czechoslovakia. Scientific Studies OSEVA Research Institute for Fodder Plants, OSEVA Breeding Institute for Fodder Plants ( 12): 97-102, 1991

Weed control in crownvetch (Coronilla varia L.). Proceedings of the Northeastern Weed Control Conference, 24: 232-4, 1970

Crownvetch d coronilla varia d seed production. Minnesota Science 25(2): 19-20, 1969

Use of herbicides in crownvetch seed production Coronilla varia. Progress report clovers and special purpose legumes research Univ of Wisconsin Dept of Agronomy5(15): 57, 1982

Trials on the introduction of crownvetch (Coronilla varia L.) in Hungary. 1980

Attempts at introducing crownvetch coronilla varia in hungary. Acta Agronomica Academiae Scientiarum Hungaricae 31(1-2): 1-10, 1982

Culture of crownvetch (Coronilla varia L.) for slope stabilization. Dissertation Abstracts International, B 39(11): 5181, 1979