Abstract
Abstract Monitoring in‐season nutrient availability in cranberry (Vaccinium macrocarpon Ait.) is hampered by tissue sampling being limited to a short, late‐summer period, and a low‐pH, high‐iron (Fe) soil environment limits soil‐test result interpretation. To evaluate monitoring available in‐season nitrogen (N), phosphorus (P), and potassium (K), commercially available ion‐exchange membranes (PRS™) were placed in plots where standard fertilizer practices were supplemented with the controlled‐release fertilizer (CRF) Osmocote™ 14–14–14 at 0, 112, 224 or 336 kg/ha rates. PRS™ nitrate (NO3)‐N was related only to CRF fertilizer, whereas PRS™ ammonium (NH4)‐N reflected both the CRF and in‐season fertilizer applications. Large increases in PRS™ NH4‐N with increasing CRF rates suggested a synergistic effect of CRF on fertilizer NH4‐N availability. PRS™ P was positively correlated with CRF P but negatively to in‐season P applications, whereas PRS™ K was related to in‐season fertilizer applications but not to CRF, suggesting poor plant P availability in the soil environment and relatively little K contribution from CRF, respectively. These results show promise for using PRS™ in cranberry.
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Claims 7
Claim · model-written summary
Membrane nitrate-N responded only to controlled-release fertilizer.
Not reportedTaxonDirection
Verbatim
e0“PRS™ nitrate (NO3)‐N was related only to CRF fertilizer”
Claim · model-written summary
Membrane ammonium-N reflected both controlled-release and seasonal fertilizer.
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Verbatim
e0“PRS™ ammonium (NH4)‐N reflected both the CRF and in‐season fertilizer applications”
Claim · model-written summary
Membrane ammonium-N rose markedly with increasing CRF rates, suggesting a synergistic effect on ammonium availability.
Not reportedTaxon
Verbatim
e0“Large increases in PRS™ NH4‐N with increasing CRF rates suggested a synergistic effect of CRF on fertilizer NH4‐N availability.”
Claim · model-written summary
Membrane phosphorus correlated positively with CRF phosphorus.
Not reportedTaxon
Verbatim
e0“PRS™ P was positively correlated with CRF P”
Claim · model-written summary
Membrane phosphorus correlated negatively with seasonal phosphorus applications.
Not reportedTaxon
Verbatim
e0“PRS™ P was positively correlated with CRF P but negatively to in‐season P applications”
Claim · model-written summary
Membrane potassium was related to seasonal fertilizer applications but not CRF.
Not reportedTaxonDirection
Verbatim
e0“PRS™ K was related to in‐season fertilizer applications but not to CRF”
Claim · model-written summary
The authors conclude that PRS membranes show promise for cranberry nutrient monitoring.
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Verbatim
e0“These results show promise for using PRS™ in cranberry.”