Studies on the Translocation of Foliar-Applied P 32 and Other Radioisotopes in Bean Plants

Potential for foliar phosphorus fertilisation of dryland cereal crops: a review

“…Several studies (Jenks and Ashworth 1999;Kirkwood 1999;Eichert and Burkhardt 2001) the chemical or physical removal of cuticular waxes increased the penetration of foliar-applied nutrients. Causing injury to leaves by light scouring also increased the penetration of nutrients (Swanson and Whitney 1953;Jenks and Ashworth 1999). This is due to the disruption of the waxy layer allowing solutes to move more freely into the leaf (Jenks and Ashworth 1999).…”

“…For the study of foliar P uptake the tracers used are 32 P/ 33 P isotopic tracers. Early use of foliar 32 P was by Silbertstein and Wittwer (1951) and Swanson and Whitney (1953). Silbertstein and Wittwer (1951) momentarily dipped the first leaf of bean and squash plants into 32 P phosphoric acid (H 3 PO 4 ) solution and found that it was rapidly absorbed with a higher fertiliser use efficiency but lower yield response than soil-applied P (where 50 times more soil P than foliar P was applied).…”

Absorption and Translocation of 2,4-Dichlorophenoxyacetic Acid and P32 by Leaves

“…Bryan et al (5) and Hauser (12) showed that the rate of absorption of 2,4-D as well as the total qualtity absorbed was increased by lowering the surface tension of sprays. Some of this effect is due to the better wetting leaves (12,21) (25) showed that p32 could be absorbed through leaf surfaces. The latter workers found, however, that this absorption was reduced by the single surfactant tried in their work.…”

“…The work of Bennett (2) suggests types of membrane changes that might be concerned in this response. Biddulph (3) and Swanson and Whitney (25) showed that p32 could be absorbed through leaf surfaces. The latter workers found, however, that this absorption was reduced by the single surfactant tried in their work.…”

“…Translocation of organic molecules, up or down, is normally limited to the phloem, while inorganic substances may move either in the xylem or phloem (17). Many workers find that translocation in the phloem is accelerated by temperature (4,13,25,26), although complicating factors of respiration, fixation, etc., enter the picture at temperatures above about 25°C. Leonard (15) and others (18,29) 2 hrs before washing.…”