A 43°F base was investigated in connection with a linear heat unit system for tomatoes in California. This base served to predict plant development in early stages of growth and provided a means for scheduling plantings. Intervals established between plantings in the spring were maintained at harvest in 2 out of 3 years. Exceptionally warm temperatures in July and August of the third year apparently delayed maturity of early plantings and resulted in a harvest season shorter than expected.
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Warnock et al. (1969) studied this question.