Articles
INFLUENCE OF SOIL IRON AND AEROBIC STATUS ON PHOSPHORUS AVAILABILITY IN CRANBERRY (VACCINIUM MACROCARPON AIT.) SOILS
Article number
446_55
Pages
369 – 380
Language
Abstract
Recent changes in cranberry agriculture warranted a reassessment of soil phosphorus (P) dynamics.
Plant tissue often tests deficient for P even though soil tests indicate adequate P content.
Three soils – peat, sand and layered peat/sand – were evaluated in the laboratory for sorption/desorption patterns and soil test effectiveness.
Each soil type was incubated with triple superphosphate fertilizer (0–44-0) at six rates: 0, 12, 23, 35, 27, or 58 kg P/ha.
Phosphorus sorption and desorption was examined under aerobic, anaerobic and transitional conditions to simulate the annual moisture patterns on a cranberry bed.
Sand soils readily released P, however only 22% was available.
Phosphorus fertilizers should be added to these soils in small doses throughout the growing season.
Very low P additions in peat soils were tightly sorped.
Approximately 30% became immediately plant available.
One half of the sorped P will eventually be released.
However, as the peat soils dry, P release declined.
Fertilizer should not be applied until these soils reach seasonal dry conditions.
Low additions of P to layered soils were also tightly sorped.
Only 33% of the sorped P will eventually be released.
Fertilizer should not be applied until this soil has reached seasonal dryness.
Currently the industry standard for soil P extraction is the Bray I method.
Comparison of this with other soil P and soil Fe extraction methods showed that the Bray I is as good or better than any other method.
However, when soil Fe levels, as determined by citrate-dithionate extraction, are higher than 200 ppm the soil test P values are not meaningful.
Due to the difficulty in evaluating available soil P, tissue testing appears to be a better method for evaluating crop nutritional status.
Plant tissue often tests deficient for P even though soil tests indicate adequate P content.
Three soils – peat, sand and layered peat/sand – were evaluated in the laboratory for sorption/desorption patterns and soil test effectiveness.
Each soil type was incubated with triple superphosphate fertilizer (0–44-0) at six rates: 0, 12, 23, 35, 27, or 58 kg P/ha.
Phosphorus sorption and desorption was examined under aerobic, anaerobic and transitional conditions to simulate the annual moisture patterns on a cranberry bed.
Sand soils readily released P, however only 22% was available.
Phosphorus fertilizers should be added to these soils in small doses throughout the growing season.
Very low P additions in peat soils were tightly sorped.
Approximately 30% became immediately plant available.
One half of the sorped P will eventually be released.
However, as the peat soils dry, P release declined.
Fertilizer should not be applied until these soils reach seasonal dry conditions.
Low additions of P to layered soils were also tightly sorped.
Only 33% of the sorped P will eventually be released.
Fertilizer should not be applied until this soil has reached seasonal dryness.
Currently the industry standard for soil P extraction is the Bray I method.
Comparison of this with other soil P and soil Fe extraction methods showed that the Bray I is as good or better than any other method.
However, when soil Fe levels, as determined by citrate-dithionate extraction, are higher than 200 ppm the soil test P values are not meaningful.
Due to the difficulty in evaluating available soil P, tissue testing appears to be a better method for evaluating crop nutritional status.
Publication
Authors
J.R. Davenport, M.T. Pitts, W. Provance, C. DeMoranville
Keywords
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