Ertragsentwicklung langjährig viehlos bewirtschafteter Öko- Ackerflächen am Oberrhein

Summary in the original language of the document

The evaluation of data from arable land in the southern part of upper Rhine valley that
has been cultivated in organic agriculture without livestock since 1972 showed
decreasing soil-contents of plant available P and K despite of positive fertilizer
balances as well as decreasing yields of cereals on sites of lower quality. Only on a
profound soil with a high level of organic substance this trend was not as marked; with
autumn rye and soybeans there the yield trend was even positive (see figure 1).