The occurrence of frost in the Geraldton tomato growing area

Since the tomato plant is frost-tender it is essential in studying the economic productivity of an area to take into consideration its local climate. This paper indicates that, even in a small horticultural locality such as Geraldton, there are wide variations in frost incidence and severity over short distances and also from year to year. The correlation between frost and antecedent weather conditions is demonstrated and in particular it is shown that most frosts are preceded by wind from between east and south. Frost prevention methods by furrow or spray irrigation, local heating or overhead suction fans are virtually; untried in the district, and some may not be practicable. Moreover the frost hazard is increased by certain horticultural practices; in particular a cold air trap is formed by the break-wind dividing-fence interlaced with scrub, the tall grass allowed to grow along the fence line and the soil banked around the perimeter during cultivation.