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Raised beds approximately 20 cm tall by 76 cm wide were formed on 1.8 m centers in the spring of 1988 and 1989. Beds were either left bare or seeded with rye  (Secale cereale)  or hairy vetch  (Vicia villosa)  at 84 or 45 kg ha -1  respectively. All plots were sprayed with glyphosate in August of each year. In 1988, a 30 cm strip was tilled in the center of each bed. In 1989, there was no tillage or mowing.  The design was a randomized complete block with four levels of nitrogen (45, 90, 134, and 179 kg ha -1 ) at each soil cover. Broccoli seedlings were transplanted in double rows on 30 cm spacings into the plots each year in late August.  Height of the raised beds was maintained with both rye and vetch. Broccoli yields were highest in the bare soil treatments In 1988, the lowest yield was with vetch, and in 1989 the lowest yield was with rye. There was a positive linear yield response to nitrogen. The number of heads harvested did not differ significantly between soil covers

MINIMUM TILLAGE AND NITROGEN INTERACTIONS IN PRODUCTION OF FALL BROCCOLI