Abstract
Summary Trials were carried out on the effect of high-pressure mercury-vapour (h.p.m.v.) illumination of seedlings, pre-planting treatments, and variety upon tomato yields. H.P.M.V. gave a slight but not statistically significant improvement in early yield. Climatological aspects which affect this result are discussed. Pricking off seedlings into 3½ inch pots gave a highly significant increase in early yield compared with pricking off into woodveneer plant frames. Early and late plantings which were sown and pricked off together gave the same season of cropping and the same yield. However, late planting decreased the early yield and increased the late yield, giving a reduced financial return. The new leaf-mouldresistant variety, V. 548, gave a highly significant increase in yield over Potentate.
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