creators_name: Cagas, Bohumir
creators_name: Machac, Radek
editors_name: Powell, Jane
editors_name: et al., 
type: conference_item
datestamp: 2006-04-28
lastmod: 2009-08-20 14:32:11
metadata_visibility: show
title: The effect of grasses grown for seed in mixture with legumes on the incidence of weeds and soil nitrogen content
ispublished: pub
subjects: 4nutrient
subjects: 1pasture
subjects: 2cropcomb
subjects: 9weed
full_text_status: public
keywords: Colloquium of Organic Researchers; COR;  weed control, soil nitrogen; farming systems; field trials; grass seed production; companion planting
abstract: This report was presented at the UK Organic Research 2002 Conference on behalf of the Colloquium of Organic Researchers (COR).
The incidence of weeds and the content of soil nitrogen were investigated in the first year of a field trial with organic grass seed production in which the grasses were grown with companion legumes. Two grass species, timothy (Phleum pratense L.) cv. Sobol and perennial ryegrass (Lolium perenne L.) cv. Baca, were tested together with three legumes: red clover (Trifolium pratense L.) cv. Start, white clover (Trifolium repens L.) cv. Vysocan and black medick (Medicago lupulina L.) cv. Ekola. The N-nutrition and control of weeds were provided by three “ecological” methods and a conventional one (bacterial nodules of legumes, mulch, organic manure and mineral fertilizer). Plots with red clover had the lowest number of weeds, those with black medick the highest. Perennial ryegrass was more competitive than timothy against weeds and the companion legume. Soil nitrogen was highest in plots with white clover and red clover. During the vegetative period the level of soil nitrogen increased in the combinations with red clover, stayed the same in combinations with white clover, but decreased in those with black medick and in control plots.
date: 2002
date_type: published
publication: Proceedings of the UK Organic Research 2002 Conference
publisher: Organic Centre Wales, Institute of Rural Studies, University of Wales Aberystwyth
pagerange: 53-54
refereed: never
referencetext: Aamlid, T., S. (1999) Organic seed production of timothy (Phleum pratense) in mixed crops with clovers (Trifolium spp.). In: Proceedings of 4th International Herbage Seed Conference, Perugia, p. 28–32. 
Cagaš, B., Machác, J., Šrámek P., Folta J., Tvrz V. (1989) Semenárství trav (Grass seed production). SEVT Praha, 152 p. 
Demela, J. (1947) Pestování travních semen (Grass seed growing). Brázda 176p.  

citation: Cagas, Bohumir and Machac, Radek (2002) The effect of grasses grown for seed in mixture with legumes on the incidence of weeds and soil nitrogen content. UK Organic Research 2002 Conference, Aberystwyth, 26-28 March 2002. In: Powell, Jane and et al., (Eds.) Proceedings of the UK Organic Research 2002 Conference, Organic Centre Wales, Institute of Rural Studies, University of Wales Aberystwyth, pp. 53-54.
document_url: http://orgprints.org/8292/1/cagas_machac_Grasses_legumes.pdf