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Hydrolysis of Cyclotri- and Cyclotetraphosphate in Soil

^a Dep. of Soil and Crop Sciences, Texas A&M Univ., College Station, TX 77843
^b Texas A&M Univ. Research and Extension Center, Route 3, Box 219, Lubbock, TX 79401

View larger version (20K): [in a new window]   Fig. 1. Sorption of monophosphorus, diphosphorus cyclotriphosphate (C3P), and cyclotetraphosphate (C4P) by a Branyon clay soil.

View larger version (26K): [in a new window]   Fig. 2. Speciation of P in Falba sandy loam soil after application of 0.100 g cyclotetraphosphate (C4P) P kg–1 soil and incubation for 552 h at 0.033 MPa moisture content and 20°C. Bars represent the standard error of the mean.

View larger version (22K): [in a new window]   Fig. 3. Speciation of P in Branyon clay soil after application of 0.100 g cyclotetraphosphate (C4P) P kg–1 soil and incubation for 336 h at 0.033 MPa moisture content and 20°C. Bars represent the standard error of the mean.

View larger version (13K): [in a new window]   Fig. 4. The relationship between ln cyclotetraphosphate (C4P) concentration and time following application of 0.100 g C4P P kg–1 soil in Falba sandy loam and incubation at 0.033 MPa moisture content and 20°C.

View larger version (20K): [in a new window]   Fig. 5. Decline in cyclotri- (C3P) and cyclotetraphosphate (C4P) in Falba sand loam soil as influenced by autoclaving and moisture conditions. Bars represent the standard error of the mean.

View larger version (12K): [in a new window]   Fig. 6. Plot of ln k1 versus reciprocal temperature (1/K) to determine energy of activation (EA) (slope) for cyclotri- (C3P) and cyclotetraphosphate (C4P) at an application rate of 0.100 g P kg–1 soil and 0.033 MPa moisture content in Branyon c soil.