RELATIONS AMONG THE WATER SUPPLY, FOLIAGE TEMPERATURE AND THE YIELD OF TOMATO

In the frame of the research work directed to the development of irrigation order of the vegetable crops since 1985 we have been examining the effect of different water supplies to the foliage temperature of the crops.
Here I demonstrate the results obtained in 1986–1987. years with the "K. Jubileum" variety of tomato (Lycopersicon esculentum L.) from the measurements performed with the infrared remote thermometer.

With the hourly (6^h–20^h) measurings performed during the vegetation period we have determined the daily foliage temperature dynamics of the tomato stands of different foliage temperature water supplies, and the day section of most suitable for characterizing the water supply.

In 1986, in 26.5 °C average air temperature, the average of foliage temperature of the optimum water-supply stand was 25.9 °C, while that of the unirrigated stand was 28.3 °C. Thus the mean foliage temperature difference between the treatments was 2.4 °C. The mean foliage temperature differences between the treatments of different water supply manifested themselves in the yield quantity as well.
In the case of optimum water-supplied stand the harvestable yield was 82.5 t/ha, while in case of the unirrigated treatment the harvestable yield was only 24.7 t/ha.
The results of the year 1987 have justified to draw similar conclusions.

III International Symposium on Processing Tomatoes

L. Helyes

https://doi.org/10.17660/ActaHortic.1990.277.12