Potassium dynamics in the soil and yield formation in a long-term field experiment
H.W. Scherer, H.E. Goldbach, J. Clemenshttps://doi.org/10.17221/4189-PSECitation:Scherer H.W., Goldbach H.E., Clemens J. (2003): Potassium dynamics in the soil and yield formation in a long-term field experiment. Plant Soil Environ., 49: 531-535.
The influence of an interrupted K fertilisation on different K fractions of the soil, yield formation and K uptake by different crops was investigated in a long-term field experiment on Luvisol derived from loess. Irrespective of the previous K fertilisation, the interruption of K fertilisation resulted in a sharp decline of CAL extractable K. K concentration in the saturation extract as well as HCl extractable K were reduced while K fixation capacity increased within 10 years after omitting K. Omitting K fertilisation decreased yields of sugar beet and potatoes while cereals were not affected, although K uptake of all crops reacted to the differentiated K supply to a different extent.Keywords:
potassium; fertilisation; availability; yield formation; potatoes; sugar beet; winter wheat