Foliar application of phosphorus compounds

Abstract

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Foliar Application of P. I. Screening of Various Inorganic and Organic P Compounds1

“…I. The following condensed phosphates were synthesized in the laboratory according to procedures described by Barel (1975): potassium and ammonium pyrophosphate, ammonium tri-and tetrapolyphosphate, ammonium monometaphosphate, ammonium tri-and tetrametaphosphate, potassium and calcium metaphosphate, and calcium (Si) metaphosphate. Three ultrahigh-analysis NH 3 -P-O reaction products and urea ammonium ortho-and polyphosphate were Condensed urea phosphate was made by mixing urea and P,0 5 in the molar rauo of 4:1 and heating it to 80 C according to the method described by Bozadzhiev and Vol'fkovich (1967).…”

“…adenosine phosphate, sugar phosphates, phytate phosphate, acetyl phosphate, carbamyl phosphate, and glycine ethyl ester phosphate. Nearly all comounds were changed to the ammonium form by passing them through an ammoniumsaturated ion-exchange column to avoid possible effects that different actions might have on P absorption (Barel 1975). Dimethyl-, trimethyl-, diethyl-, triethyl-, tripropyl-, dibutyl-, and tributyl-phosphate were used in unaltered form.…”

Greenhouse studies on the effects of foliar spray of nutrient solutions during the grain filling period on spring wheat (Triticum aestivum L.) and black field bean (Phaseolus vulgaris L.) varieties

“…This may be interpreted as due to lack of photosynthetic production due to burns on leaves surfaces. However, if that was the case, weight of seed should be the one that decreased because burned areas tended to increase with time (as reported by Barel, 1975) and weight of seed is the last of the yield component then it is expected to be affected by foliar fertilization. Since nutrients can be partially stored and then mobilized there is a possibility that stored nutrients increased with foliar treatment along with an increase in the sink size due to increased pod number.…”

“…There is no need to review mechanisms of foliar absorption or penetration of nutrient solutions as they have been reviewed already by Franke (1967) and more recently by Barel (1975).…”

“…It can be seen that varieties one and two had a higher nutrient demand than varieties three and four. Barel (1975).…”