Abstract
The effects of clear polyethylene mulch, soil ridges, and row orientation on soil temperature, soil moisture and crop growth were studied in field experiments north of latitude 60°, with cabbage as the test crop. Mulch increased soil temperature and cabbage yield regardless of ridge type and row orientation. Soil temperature differences between mulched plots were small at 8:00 a.m. but large at 3:30 p.m. The highest temperatures at 3:30 p.m. were obtained in the even-ridge, followed in decreasing order by uneven-ridge, no-ridge and double-ridge treatments. Soil moisture levels were lower in the mulched single-ridge plots than in the mulched double-ridge and no-ridged plots. No differences were found between single ridges running north—south and single ridges running east—west.
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