The early relative growth rates of six lettuce cultivars as affected by temperature

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Abstract
SUMMARY: Six lettuce cultivars were grown to a dry weight of about 0.2 g per plant at four constant temperatures with high light intensity and ample nutrients. Relative growth rates (RGR) were sigmoidally related to temperature, averaging 0.11 g/g/day at 10 °C and 0.35 g/g/day at 22 °C. The cultivars Cobham Green and Avoncrisp had higher RGRs than the others, but the cultivar‐temperature interaction was not statistically significant. Temperature affected both components of RGR, i.e. net assimilation rate and leaf area ratio, about equally: the faster‐growing cultivars had higher net assimilation rates than the others. Growth rate predictions from the cabinet work agreed fairly well with observations made in the field.

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