A Model of the Influence of Air Temperature and Solar Radiation on the Time to Maturity of Calabrese Brassica oleracea var italica

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Abstract
The concept of thermal time is applied to the prediction of duration from sowing to maturity of calabrese (Brassica oleracea var italica cv. Corvet), using a multiple linear regression model. Given daily records of maximum and minimum air temperature and total solar radiation, maturity could be predicted to within ±7 d for nine out of ten crops over the four years considered. Within any one year the precision improved to ±5 d. Calabrese appeared to stop developing at a base temperature of 0 °C. Thermal time accounted for 74·3 per cent of the variation in reciprocal total duration and solar radiation a further 17·7 per cent.

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