ISHS Acta Horticulturae 278: Symposium on Scheduling of Irrigation for Vegetable Crops under Field Condition
ULTRASOUND EMISSIVITY IN CORN SUBMITTED TO WATER STRESS |
| Authors: | A. Raschi, G. Zipoli, L. Galli, C. Vazzana |
| DOI: | 10.17660/ActaHortic.1990.278.30 |
| Abstract:
Ultrasound emissivity is nowadays considered a good indication of the presence of cavitative events, and an ecophysiological parameter well correlated to others, such as xylem water potential and transpiration. No published data exist about the distribution of cavitation events in herbaceous crop canopy profiles, nor about the relationships between ultrasound emissivity and other water stressindicators, such as the crop water stress index. We show that emission rate from high internodes is higher, while from the low ones it is comparatively limited; emission rate from water stressed plants is high; emissivity from well watered plants is also high, in particular near midday. The aims of our research were only partially attained; yet we show how, after a period of high water stress, a reduction of differential in C.W.S.I. between a well watered and a water stressed plot can result in a lower ultrasound emission from the water stressed one: this result agrees with data reported in literature about reduced emissivity during recovery from stress. The possible water use improvement in presence of a partial stomatal closure is discussed. | |
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