Abstract
Abstract Extraction of soil zinc with routine chemical extractants does not always reflect differences in Zn availability as detected by plant uptake. This study was undertaken to explore and compare the use of an ion exchange resin and diethylenetriaminepentaacetic acid (DTPA) for extracting soil Zn as related to plant Zn uptake. Beans were grown in 1989 following differential cropping with corn and beans or fallow in 1988 on a Portneuf silt loam near Kimberly, Idaho. Two Zn fertilizer treatments were imposed across previous cropping treatments. A batch method for determining resin extractable soil Zn was established. Both plant Zn concentration and Zn uptake by beans in 1989 were significantly higher in Zn fertilized than unfertilized treatments regardless of previous crop; and higher in plots previously cropped with corn than beans or fallow, regardless of Zn treatment. DTPA and resin extractable soil Zn were significantly higher in Zn fertilized plots compared to unfertilized plots but did not differ between previous cropping treatments. Resin and DTPA extractable soil Zn concentrations were positively correlated. Resin extracted soil Zn correlated better with plant Zn concentration and Zn uptake throughout the growing season than DTPA extracted soil Zn, particularly in plots that had been fallowed or previously cropped with corn. Resin may be extracting labile soil Zn not extracted with DTPA and, therefore, be better simulating plant uptake. Both extraction methods correlated better with Zn uptake when evaluated within cropping treatments, emphasizing the need to consider previous crop when calibrating soil tests.
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Claims 7
Claim · model-written summary
Zn fertilized beans had significantly higher plant Zn concentration and Zn uptake than unfertilized beans, regardless of previous crop.
Verbatim
t0“Comparison of DTPA and resin extractable soil Zn to plant Zn uptake”
e0“Beans were grown in 1989 following differential cropping with corn and beans or fallow in 1988 on a Portneuf silt loam near Kimberly, Idaho”
e2“Both plant Zn concentration and Zn uptake by beans in 1989 were significantly higher in Zn fertilized than unfertilized treatments regardless of previous crop”
Claim · model-written summary
Beans previously cropped with corn had higher plant Zn concentration and Zn uptake than beans or fallow.
Verbatim
t0“Comparison of DTPA and resin extractable soil Zn to plant Zn uptake”
e0“Beans were grown in 1989 following differential cropping with corn and beans or fallow in 1988 on a Portneuf silt loam near Kimberly, Idaho”
e2“Both plant Zn concentration and Zn uptake by beans in 1989 were significantly higher in Zn fertilized than unfertilized treatments regardless of previous crop”
e3“higher in plots previously cropped with corn than beans or fallow, regardless of Zn treatment”
Claim · model-written summary
Zn fertilization significantly raised resin and DTPA extractable soil Zn relative to unfertilized plots.
Verbatim
t0“Comparison of DTPA and resin extractable soil Zn to plant Zn uptake”
e0“Beans were grown in 1989 following differential cropping with corn and beans or fallow in 1988 on a Portneuf silt loam near Kimberly, Idaho”
e4“DTPA and resin extractable soil Zn were significantly higher in Zn fertilized plots compared to unfertilized plots but did not differ between previous cropping treatments”
Claim · model-written summary
Resin and DTPA extractable soil Zn did not differ between previous cropping treatments.
Verbatim
t0“Comparison of DTPA and resin extractable soil Zn to plant Zn uptake”
e0“Beans were grown in 1989 following differential cropping with corn and beans or fallow in 1988 on a Portneuf silt loam near Kimberly, Idaho”
e4“DTPA and resin extractable soil Zn were significantly higher in Zn fertilized plots compared to unfertilized plots but did not differ between previous cropping treatments”
Claim · model-written summary
Resin and DTPA extractable soil Zn concentrations were positively correlated.
Verbatim
t0“Comparison of DTPA and resin extractable soil Zn to plant Zn uptake”
e0“Beans were grown in 1989 following differential cropping with corn and beans or fallow in 1988 on a Portneuf silt loam near Kimberly, Idaho”
e5“Resin and DTPA extractable soil Zn concentrations were positively correlated”
Claim · model-written summary
Resin extractable soil Zn correlated better with plant Zn concentration and uptake than DTPA extractable soil Zn throughout the growing season.
Verbatim
t0“Comparison of DTPA and resin extractable soil Zn to plant Zn uptake”
e0“Beans were grown in 1989 following differential cropping with corn and beans or fallow in 1988 on a Portneuf silt loam near Kimberly, Idaho”
e6“Resin extracted soil Zn correlated better with plant Zn concentration and Zn uptake throughout the growing season than DTPA extracted soil Zn”
Claim · model-written summary
Both extraction methods correlated better with Zn uptake when evaluated within cropping treatments.
Verbatim
t0“Comparison of DTPA and resin extractable soil Zn to plant Zn uptake”
e0“Beans were grown in 1989 following differential cropping with corn and beans or fallow in 1988 on a Portneuf silt loam near Kimberly, Idaho”
e7“Both extraction methods correlated better with Zn uptake when evaluated within cropping treatments”
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