NOTE: A COMPARISON OF THE PRESSURE CHAMBER APPARATUS AND SHARDAKOV METHOD IN DETERMINING LEAF WATER POTENTIAL OF CASSAVA AND SOΥΒΕΑΝ

Abstract

The efficiency of the Shardakov or dye method in measuring the leaf water potentials of cassava (Manihot esculenta Crantz var. Hawaiian 4) and soy-bean (Glycine max [L.) Merr. var. Clark 63) was evaluated and compared with that of the pressure chamber apparatus. These methods were compared by mea-suring parallel (same plant), fresh leaf samples subjected to varying degrees of soil drying. Pressure chamber measurements were made on whole leaves while Shardakov method measurements were made on leaf discs. A regression analysis showed an agreement between the two methods. Results indicate that the Shar-dakov or dye method is as useful as the pressure chamber apparatus in measuring the leaf water potentials of cassava and soybean.