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Publikasjoner

NIBIOs ansatte publiserer flere hundre vitenskapelige artikler og forskningsrapporter hvert år. Her finner du referanser og lenker til publikasjoner og andre forsknings- og formidlingsaktiviteter. Samlingen oppdateres løpende med både nytt og historisk materiale. For mer informasjon om NIBIOs publikasjoner, besøk NIBIOs bibliotek.

2006

Sammendrag

Soil mapping by means of the EM38 device is offered commercially in many countries. The most common way to perform the mapping in the field is to tow the instrument on a sled behind a terrain vehicle. This normally involves mounting the instrument at a certain height h above the ground. The measurements of ECa with EM38 are, however, strongly affected by this height. The objective of this research is to find a simple but robust method to correct for the height at which the EM38-measurements were made. Measurements with EM38 were conducted in an field trial with alternative fertilizer applications (0, 60, 90, 120 and 150 kg N ha-1) to spring barley, at two sites with morainic loam in SE Norway; Apelsvoll Research Centre (60°42"N, 10°51"E) and Kise Research Station (60°46"N, 10°48"E). Two weeks after sowing/fertilization in spring 2003 (May 27), ECa was measured at both sites on all five treatments in three of the 20 replicate blocks on the ground and at 20, 40 and 60 cm above the soil surface. In conclusion, the correction functions presented offer theoretical models to correct EM38-measurements when measuring at an instrument height of 20 cm above the ground surface, a height which is within the interval of what is commonly used in practice for mobile operation of the device.