Abstract
Incubation for short periods at a high moisture content reduced the subsequent plant uptake of phosphorus from recently applied monocalcium phosphate in several soils. The effects on phosphorus uptake were reflected in the amounts of phosphate extracted by 0.5M sodium bicarbonate and by 0.01M calcium chloride. Phosphate availability decreased with increasing moisture content up to saturation. At saturation, availability decreased with increasing incubation period up to 4 days, but was not reversed by several weeks of subsequent incubation at 100 cm tension. The effect of waterlogging usually was greater on the air-dried soil than on soil which had undergone moist pre-incubation. The results suggest that the decrease in phosphate availability was closely associated with the reduction of iron during the anaerobic phase and its subsequent oxidation. Preincubation at 100 cm tension progressively decreased the amount of iron released, and phosphate subsequently immobilized. This appeared to be caused by oxidation of organic substrate during the aerobic phase, thus delaying the onset of anaerobiosis during waterlogging. Phosphate applied to the surface was affected by waterlogging in a similar way to phosphate mixed into the soil.
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Claims 8
Claim · model-written summary
Brief incubation at high moisture reduced plant phosphorus uptake from monocalcium phosphate.
Not reportedTaxonComparator
Verbatim
e0“Incubation for short periods at a high moisture content reduced the subsequent plant uptake of phosphorus from recently applied monocalcium phosphate in several soils.”
Claim · model-written summary
Phosphate availability declined as moisture increased to saturation.
Not reportedTaxon
Verbatim
e0“Phosphate availability decreased with increasing moisture content up to saturation.”
Claim · model-written summary
At saturation, phosphate availability declined with incubation time up to four days.
Not reportedTaxon
Verbatim
e0“At saturation, availability decreased with increasing incubation period up to 4 days”
Claim · model-written summary
Subsequent incubation at 100 cm tension did not reverse the decrease in phosphate availability.
Not reportedTaxonComparator
Verbatim
e0“but was not reversed by several weeks of subsequent incubation at 100 cm tension.”
Claim · model-written summary
Waterlogging usually had greater effects on air-dried than moist pre-incubated soil.
- Treatment
- waterlogginge0
- Outcome
- effect of waterlogginge0
- Direction
- greatere0
- Comparator
- soil which had undergone moist pre-incubatione0
Not reportedTaxon
Verbatim
e0“The effect of waterlogging usually was greater on the air-dried soil than on soil which had undergone moist pre-incubation.”
Claim · model-written summary
Preincubation at 100 cm tension progressively reduced iron release.
Not reportedTaxonComparator
Verbatim
e0“Preincubation at 100 cm tension progressively decreased the amount of iron released, and phosphate subsequently immobilized.”
Claim · model-written summary
Preincubation at 100 cm tension progressively reduced subsequent phosphate immobilization.
- Treatment
- Preincubation at 100 cm tensione0
- Outcome
- phosphate subsequently immobilizede0
- Direction
- decreasede0
Not reportedTaxonComparator
Verbatim
e0“Preincubation at 100 cm tension progressively decreased the amount of iron released, and phosphate subsequently immobilized.”
Claim · model-written summary
Surface-applied phosphate responded to waterlogging similarly to phosphate mixed into soil.
- Treatment
- waterlogginge0
- Outcome
- Phosphate applied to the surfacee0
- Direction
- in a similar waye0
- Comparator
- phosphate mixed into the soile0
Not reportedTaxon
Verbatim
e0“Phosphate applied to the surface was affected by waterlogging in a similar way to phosphate mixed into the soil.”