ZUR BEDEUTUNG VON ANTITRANSPIRATIONSMITTELN FÜR TROPISCHE KULTURPFLANZEN

Abstract

The influence of different foliar sprays as antitranspirants (solutions of Octodecanol 0.1-0.5% and some substances which are commonly used in Columbia as pesticides such as Triton 15%, Cresopinol 10%, oil emulsion 1%) have been tested on Trifolium repens, Phaseolus vulgaris and Manihot esculenta under field and under glass-house conditions. The water loss of these plants decreased considerably after application. A remarkable reduction of the speed of water transport in the stem could be measured as well as a decline of both transpiration and water deficit of the leaves. Decrease of leaf temperatures and porometer values have been observed. Octodecanol was most efficient, followed by Triton 500. A spray of oil caused infiltration and toxic effects; the same influences have been noted after application of Cresopinol, but somewhat less frequently.