ISSN:
1435-0661
Source:
Springer Online Journal Archives 1860-2000
Topics:
Geosciences
,
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
2 PO4)2, NH4H2PO4, (NH4)2HPO4, Na2HPO4.2H2O, and K2HPO4] were applied to the soils at a rate of 500 g P m–3 soil. Microscope slides were covered with anion-exchange paper (filter paper impregnated with Fe hydroxide) and laid between two soil layers in a diffusion chamber. Fifteen days later, P was extracted from the exchange soil and analyzed. Five hundred grams P m–3 soil as the Ca source were also applied to soil samples and incubated for 30 d. Phosphorus diffusive flux was measured as described above. The Ca source of P reduced P diffusive flux by as much as 77% compared with the other sources. This reduction was attributed to the effect the P source had on soils pH. Sandy soils showed less difference between P sources than did clayey soils because the P applied to the sandy soils was in excess of their maximum sorptive capacity. Incubation for 30 d reduced P diffusive flux by up to 81%. Different P sources affect the availability of P in these soils by influencing mobility. Choosing the best source can increase diffusive flux by up to 242% under these soil conditions.
Type of Medium:
Electronic Resource
