Factors affecting zinc uptake in cropping systems

Hamilton, M.A. and Westermann, D.T. and James, D.W. (1993) Factors affecting zinc uptake in cropping systems. Soil Science Society of America Journal. 57:1310-1315.

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Abstract

Zinc availabilities can change with different cropping management
practices. The objective of this study was to identify some of the causative
factors associated with previous crops contributing to Zn uptake
differences in a subsequent crop. Field studies over 3 yr evaluated the
Zn availability after four precropping treatments: bean (Phaseolus
vulgaris L.), corn (Zea mays L.), wheat (Triticum aestivum L.), and
fallow, across two Zn fertilization rates (with and without 11 kg Zn
ha-1 as ZnSO4), using the 'Viva' bean as a test crop. Soil samples
taken before and after the test crop were analyzed for extractable P,
Zn, Cu, Mn, and Fe, and organic matter. Soil respiration during the
test crop was periodically estimated the last cropping year. Whole
plant samples estimated nutrient concentration and uptake. Soil Zn
extracted by diethylenetriaminepentaacetic acid (DTPA) was increased
by Zn fertilization but not affected by precropping treatments.
Zinc uptake by bean was significantly higher after precropping with
corn and lower after fallow regardless of Zn fertilization. Uptake
differences were most pronounced during early plant growth. Phosphorus
and Cu uptake varied with treatment in a similar pattern as
Zn uptake, and were positively correlated with each other. Zinc uptake
was also positively correlated with soil organic matter and negatively
correlated with soil P. Soil respiration rate was significantly
lower after the fallow treatment compared with other precropping
treatments. Vesicular-arbuscular mycorrhiza (VAM) colonization in
the test crop roots was higher after corn and lower after fallow regardless
of soil Zn concentrations. Colonization was positively correlated
with Zn, P, and Cu uptake during early plant growth. The
VAM colonization, soil respiration, and DTPA-extractable Zn were
selected by a stepwise regression procedure as the important variables
affecting Zn uptake during early plant growth. These results emphasize
the importance of the soil's biological activities on Zn availability
and may help explain some field observations where chemical soil tests
appear to fail.

Item Type:	Article
NWISRL Publication Number:	0821
Subjects:	Mass Import - unclassified
Depositing User:	Dan Stieneke
Date Deposited:	20 Nov 2010 21:53
Last Modified:	01 Dec 2016 20:56
Item ID:	606
URI:	https://eprints.nwisrl.ars.usda.gov/id/eprint/606