VI. WATER CONTROL AND MEASUREMENT - MEASUREMENT OF PLANT WATER STATUS OF GREENHOUSE CROPS WITH PRESSURE BOMB AND β-GAUGE

P.A.M. Hopmans
The use of the pressure bomb as a simple field method to measure plant water potential psiplant and of the beta-gauge as a non-destructive method to record continuously the leaf thickness (to be related to plant water content) is described.

With the pressure bomb the relation of psiplant and soil water potential psisoil at decreasing soil moisture content was determined and the daily course of psiplant at constant psisoil on sunny days on plants in pots of bean, carnation, chrysanthemum, pepper, spinach and strawberry. With a pressure bomb and with a beta-gauge plant water status was followed in a crop of roses in a greenhouse with fan and pad cooling. The pressure bomb turned out to be a useful method to assess the level and variations of the plant water balance for most species studied, however, not for all. In the rose crop it indicated variations of the water balance rather sensitively, but the magnitude of psiplant was probably measured too low. The beta-gauge was sensitive enough to measure the effects of short period variations of radiation on the plant water balance.

Hopmans, P.A.M. (1974). VI. WATER CONTROL AND MEASUREMENT - MEASUREMENT OF PLANT WATER STATUS OF GREENHOUSE CROPS WITH PRESSURE BOMB AND β-GAUGE. Acta Hortic. 35, 113-122
DOI: 10.17660/ActaHortic.1974.35.15
https://doi.org/10.17660/ActaHortic.1974.35.15

Acta Horticulturae