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Survival of weed seeds and seed pathogen propagates in composted grass seed straw



Survival of weed seeds and seed pathogen propagates in composted grass seed straw



Applied engineering in agriculture 12(1): 57-63



Seeds of annual bluegrass (Poa annua), annual ryegrass (Lolium multiflorum) and tall fescue (Festuca arundinacea Schreber), and propagules of two fungal pathogens of grass Gloeotinia temulenta (blindseed) and Claviceps purpurea (ergot) were placed in mesh packets and inserted into compost windrows of perennial ryegrass (Lolium perenne) straw. Compost treatments included three types of straw, two methods of turning, and three depths of seed or propagule placement. Packets were inserted to depths of 0.3, 0.6, and 0.9 m (1, 2, and 3 ft) and corresponding internal compost temperatures were recorded weekly. Windrows were turned either zero, two, four, or six times over eight months. During the 1992-1993 season, windrows were turned with a commercial straddle-type compost turner and in the 1993-1994 season, windrows were turned with a tractor front-end loader. Composting proceeded without addition of nitrogen except for that present in the straw and without water beyond normal rainfall. Survival of weed seeds and pathogen propagules decreased with numbers of turns, but was not related to straw collection method, depth of packet placement, or method of turning.

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Accession: 002973171

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