Journal of Food, Agriculture and Environment

Allelopathic effects of cover crops on spring barley germination and establishment

Author(s):

Aušra Marcinkevičienė ^{1, 2}, Zita Kriaučiūnienė ^1*, Vaclovas Bogužas ², Rimantas Velička ^{1, 2}

Recieved Date: 2013-06-09, Accepted Date: 2013-10-22

Abstract:

The allelopathicaly active substances (the allelochemicals) which include phenolics or terpenoids generally representing secondary metabolites in cover crops may have stimulative, suppressive or a neutral effect on subsequent crop emergence and growth therefore is influencing yield. The aim of our investigations was to evaluate the allelopathic effect of aqueous extracts of aboveground mass of cover crop species such as red clover (Trifolium pratense L.), Italian ryegrass (Lolium multiflorum L. Lam. var. westerwoldicum Wittm.), white mustard (Sinapis alba L.), and winter rape (Brassica napus L. ssp. oleifera biennis Metzg.) on spring barley (Hordeum vulgare L.) germination and establishment. Treatments were distilled water (control) and the five aqueous extracts of dry aboveground mass and water (1:6250; 1:1250; 1:250; 1:50; 1:10). Spring barley was tested in Petri dishes on i) filter paper and ii) in the soil with each of the above mentioned extracts. Laboratory experiments were carried out at the Aleksandras Stulginskis University. Plant extracts (1:10) of red clover, Italian ryegrass, winter rape and white mustard inhibited germination of spring barley and seedling development on filter paper. Post harvest residues also inhibited spring barley germination and seedling establishment on filter paper. In soil, allelopathic effect of all of the extracts on spring barley was weaker, and winter rape showed no allelopathic effect. Growth of spring barley seedlings was stimulated by extract of winter rape (1:1250) when it was germinated on filter paper, and similar stimulatory effect of Italian ryegrass (1: ≥50) was noted when spring barley was germinated in soil.

Keywords:

Allelopathy, aqueous extract, germination, cover crop, Italian ryegrass, red clover, roots, shoots, spring barley, white mustard, winter rape

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Journal: Journal of Food, Agriculture and Environment
Year: 2013
Volume: 11
Issue: 3&4
Category: Agriculture
Pages: 684-688

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