TY  - JOUR
A1  - Mueller, Marina Elsa Herta
A1  - Koszinski, Sylvia
A1  - Brenning, Alexander
A1  - Verch, Gernot
A1  - Korn, Ulrike
A1  - Sommer, Michael
T1  - Within-field variation of mycotoxin contamination of winter wheat is related to indicators of soil moisture
JF  - Plant and soil
N2  - Humidity is an important determinant of the mycotoxin production (DON, ZEA) by Fusarium species in the grain ears. From a landscape perspective humidity is not evenly distributed across fields. The topographically-controlled redistribution of water within a single field rather leads to spatially heterogeneous soil water content and air humidity. Therefore we hypothesized that the spatial distribution of mycotoxins is related to these topographically-controlled factors. To test this hypothesis we studied the mycotoxin concentrations at contrasting topographic relief positions, i.e. hilltops and depressions characterized by soils of different soil moisture regimes, on ten winter wheat fields in 2006 and 2007. Maize was the preceding crop and minimum tillage was practiced in the fields. The different topographic positions were associated with moderate differences in DON and ZEA concentrations in 2006, but with significant differences in 2007, with six times higher median ZEA and two times higher median DON detected at depression sites compared to the hilltops. The depression sites correspond to a higher topographic wetness index as well as redoximorphic properties in soil profiles, which empirically supports our hypothesis at least for years showing wetter conditions in sensitive time windows for Fusarium infections.
KW  - Wheat
KW  - Mycotoxins
KW  - Within-field variation
KW  - Topography
KW  - Humidity
KW  - Soil redoximorphic feature
Y1  - 2011
U6  - https://doi.org/10.1007/s11104-010-0695-5
SN  - 0032-079X
SN  - 1573-5036
VL  - 342
IS  - 1-2
SP  - 289
EP  - 300
PB  - Springer
CY  - Dordrecht
ER  -