Schwärzel, Kai und Feger, Karl-Heinz und Carick, Sam und Buchan, Graeme
(2010)
How does crop management control soil hydraulic properties?
In: Jahrestagung der DBG 2009: Böden - eine endliche Ressource, September 2009, Bonn.
Kurzfassung
In our study, the change in soil hydraulic properties in response to crop/ pasture rotation was measured at the organic cropping farm of Lincoln University, on the Canterbury Plains of NZ’s South Island. The soil is a well-drained sandy loam, formed in 50 – 100 cm of fine textured alluvium, classified as a Typic Dystrustept in the U.S. system and as a Pallic Soil, type Templeton sandy loam, in the NZ system. Such soils are used predominantly for grazed pasture, with some mixed cropping. The sample sites were in two adjacent fields on the same soil type. One site had been under grazed pasture for 1.5 years, after being cropped for 2 years. The adjacent site had been cropped for 2 years, after being in pasture for 2 years. Combined hood and disc infiltrometer measurements were conducted at pressure supply heads of 0, –2, –4, –8, and –12 cm. Following all infiltration experiments, we extracted 22 (eleven from each site) undisturbed soil cores, from beneath the positions where the infiltration had been measured. These cores were used to determine (desorption) water retention curves and bulk densities. Also, the carbon content of each sample was measured. In this presentation, crop- and management-induced changes in soil hydraulic properties will be presented and discussed.
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