The effects of basal stem and root zone heating with different heating times and durations on the growth of primary shoots and lateral branches and roots, and on transpiration and photosynthesis were investigated in forcing culture of eggplant. Basal stem heating accelerated the growth of lateral branches and increased their number. Transpiration and photosynthesis rates of the leaves and amount of nutrient solution uptake increased by both basal stem and root zone heating as compared with the control. Growth habits differed by the heating positions: basal stem heating promoted the growth of lateral branches and root zone heating promoted that of primary shoots and roots. The longer the heating duration, the more the lateral branches grew. The heating time did not affect the growth of lateral branches when the heating duration was the same.
Daytime temperatures in the greenhouse are often lower than the suitable growth temperature for forcing culture of tomato in Fukuoka. The effect of daytime heating on the marketable fruit yield during the winter season was investigated in this study. An increase of the minimum day temperature from 8°C to 20°C by a heater resulted in a significant increase of the number of marketable fruits, by improvement of the marketable fruit rates and intervals between anthesis and fruit ripening. In addition, fruit growth after flowering was accelerated when tomato plants were heated in the daytime. It was assumed that photosynthesis of the leaves accelerated, and translocation to fruit increased due to the rising air temperature. As a result, the marketable fruit yield on daytime heating was larger than in the control from April to May.
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