Abstract
Abstract Sweet potato [Ipomoea batatas (L.) Lam.] cv. Travis storage roots were bedded on 8 and 27 Mar. 1985 according to standard cultural practices. The following row cover and mulch treatments were tested for their effects on early transplant production: a) bare soil (control); b) black polyethylene mulch; c) nonwoven polyester row cover; d) slitted, clear polyethylene row cover; or e) slitted, white polyethylene row cover. All row cover and mulch treatments increased soil temperature (at a 5-cm depth) relative to the bare soil. Compared to black polyethylene mulch, slitted, clear polyethylene row covers increased soil temperatures, whereas soil temperature was reduced by slitted white polyethylene. Mulch and row covers increased weight and number of large transplants as compared to bare soil. The primary effect of row covers as compared to mulch was to increase the percentage of large (>15 cm long) transplants. The use of slitted, clear polyethylene and slitted, white polyethylene row covers appeared to reduce the incidence of sclerotial blight (Scleratium rolfsii) in plant beds. Row cover and mulch treatments did not alter yield of storage roots grown from transplants produced under the various bed treatments.
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