Incubation experiments with an acid poorly drained soil have
shown that the application of neutral soluble salts influenced the level
of extractable Mn. The application of a salt which lowered the soil
pH either increased the extractable Mn or retarded the oxidation
and/or fixation of extractable Mn. This effect was...
Lime was applied at different rates to filbert trees grown in
containers in an acid soil. As lime application rate increased, the
leaf Mn and extractable soil Mn were significantly reduced. In
control trees leaf Mn was over 1300 ppm, but no growth reduction or
Mn toxicity symptoms were found....
This study was conducted to investigate the differences of the
profile distribution of free iron and free manganese and the reduction-oxidation changes in soils of the Willamette drainage sequence.
Based on the results of the chemical analyses, free iron and
free manganese distributions in these soils were governed to a...
Intimate associations with reactive metal species permanently protect soil organic matter (SOM) from microbial access and oxidation, contributing to the build-up of organic carbon (C) stocks in soils. It is increasingly recognized, however, that such associations can be reversible and that reactive metal species might even facilitate the oxidation of...
With agriculture continuing to play an ever-increasing role in our modern economy, more and more attention is being directed toward the hitherto more or less neglected finer points of crop production. In the past it has been the tendency to concentrate research on those factors which most obviously affect agricultural...
A series of field experiments was established in 1978, 1979, and 1980 on Lower Klamath Lake where Mn deficiency of oats had been observed in previous years. The pH of the soils ranged from 7.6 to 8.3 and the organic matter content was between 17 and 19%. The objectives of...
Representative sites of the Dayton, Woodburn, Jory, Quillayute, Astoria, Willamette, Walla Walla, Deschutes, Laki and Owyhee soil series were investigated for seasonal changes in exchangeable potassium in air dry samples. No consistent seasonal variations were found which could be attributed to wetting and drying in the field. Cropping reduced the...