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2015 ; 10
(12
): e0145370
Nephropedia Template TP
gab.com Text
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English Wikipedia
Long-Term Effect of Crop Rotation and Fertilisation on Bioavailability and
Fractionation of Copper in Soil on the Loess Plateau in Northwest China
#MMPMID26694965
Zang Y
; Wei X
; Hao M
PLoS One
2015[]; 10
(12
): e0145370
PMID26694965
show ga
The bioavailability and fractionation of Cu reflect its deliverability in soil.
Little research has investigated Cu supply to crops in soil under long-term
rotation and fertilisation on the Loess Plateau. A field experiment was conducted
in randomized complete block design to determine the bioavailability and
distribution of Cu fractions in a Heilu soil (Calcaric Regosol) after 18 years of
rotation and fertilisation. The experiment started in 1984, including five
cropping systems (fallow control, alfalfa cropping, maize cropping, winter wheat
cropping, and grain-legume rotation of pea/winter wheat/winter wheat + millet)
and five fertiliser treatments (unfertilised control, N, P, N + P, and N + P +
manure). Soil samples were collected in 2002 for chemical analysis. Available Cu
was assessed by diethylene triamine pentaacetic acid (DTPA) extraction, and Cu
was fractionated by sequential extraction. Results showed that DTPA-Cu was lower
in cropping systems compared with fallow control. Application of fertilisers
resulted in no remarkable changes in DTPA-Cu compared with unfertilised control.
Correlation and path analyses revealed that soil pH and CaCO3 directly affected
Cu bioavailability, whereas available P indirectly affected Cu bioavailability.
The concentrations of Cu fractions (carbonate and Fe/Al oxides) in the plough
layer were lower in cropping systems, while the values in the plough sole were
higher under grain-legume rotation relative to fallow control. Manure with NP
fertiliser increased Cu fractions bound to organic matter and minerals in the
plough layer, and its effects in the plough sole varied with cropping systems.
The direct sources (organic-matter-bound fraction and carbonate-bound fraction)
of available Cu contributed much to Cu bioavailability. The mineral-bound
fraction of Cu acted as an indicator of Cu supply potential in the soil.