Suppression of Digitaria sanguinalis and Amaranthus palmeri using autumn-sown glucosinolate-producing cover crops in organically grown bell pepper

• Published in: Weed research Vol. 47; no. 5; pp. 425 - 432
• Main Authors: NORSWORTHY, J.K, MALIK, M.S, JHA, P, RILEY, M.B
• Format: Journal Article
• Language: English
• Published: Oxford, UK Oxford, UK : Blackwell Publishing Ltd 01.10.2007; Blackwell Publishing Ltd; Blackwell Science
• Subjects: allelopathy; Biological and medical sciences; Capsicum annuum; cover crops; Fundamental and applied biological sciences. Psychology; glucosinolate; large crabgrass; organic crop production; palmer amaranth; Parasitic plants. Weeds; Phytopathology. Animal pests. Plant and forest protection; Weeds; Monocotyledones; Glucosinolate; Suppression; Cover crop; C4-Type; organic crop production; Amaranthaceae; cover crops; Gramineae; Dicotyledones; Weed science; Angiospermae; Thioglycoside; Ruderal plant; Capsicum annuum; Carbohydrate; Solanaceae; Season; palmer amaranth; Plant production; Production system; Digitaria sanguinalis; Weed; Sulfur Organic compounds; Autumn; Biochemical compound; Allelopathy; Oside; Amaranthus palmeri; large crabgrass; Sowing date; Vegetable crop; Organic agriculture; Flavoring crop; Spermatophyta; Fodder crop; Heteroside
• ISSN: 0043-1737; 1365-3180
• DOI: 10.1111/j.1365-3180.2007.00586.x

Experiments were conducted to compare growth characteristics, biomass production and glucosinolate content of seven autumn-planted glucosinolate-producing cover crops that were terminated the following spring. The control of Digitaria sanguinalis and Amaranthus palmeri following cover crop incorporation into soil was characterised and fruit yields of bell pepper transplanted into cover crop-amended soil were determined. Differences in glucosinolate concentration and composition were noted between cover crop roots and shoots and among cover crops. Total biomass production by cover crops ranged from 103 g m⁻² for garden cress to 894 g m⁻² for Indian mustard (F-E75), but cover crop biomass was not correlated with D. sanguinalis and A. palmeri control. D. sanguinalis and A. palmeri control in bell pepper varied by cover crop. D. sanguinalis control by cover crops ranged from 38% to 79%, and A. palmeri control was 23% to 48% at 4 weeks after transplanting (WATP) bell pepper in 2004. D. sanguinalis control was positively correlated with total glucosinolate production, but A. palmeri control was not. D. sanguinalis control in 2005 ranged from 0% to 38% at 2 WATP. In the absence of weeds, cover crops did not negatively affect fruit yields which were often higher than in the absence of a cover crop. Glucosinolate-producing cover crops are not a stand-alone weed management strategy, but some will provide early season control of D. sanguinalis and A. palmeri without having a negative effect on transplanted bell pepper.