Einfluß der Anbauhäufigkeit von Winterraps auf das Auftreten von Schadfaktoren,die Ertragsleistung und Qualitätsmerkmale

Influence of the Cultivation Frequency of Winter Rape Seed on the Occurrence of Noxious Factors, on Crops and Quality Characteristics In a test series of crops, carried out in 1976 at the Ihinger Hof (480 m NN; 7.8° C mean annual temperature and 685 mm rainfall) with rape seed share of 25,33 and 50 % the importance of cultivation frequency with respect to the occurrence of deseases and parasites should be investigated and effects on crops and quality characteristics should be examined. After a running in period of several years a relation between the rape seed share in dependence on years and cultivated genotype and the occurrence of rottenness of the upper part of the root and the stem can be found which does not occur for the unregularly existing rape seed cancer. Higher shares of rape seed in the crop sequence lead to an average lower crop of nearly 10 % and to increased variation coefficients which indicate an increasing instability of crop. Investigations of the total N-content of the corn material show a year depending increase of the content of higher rape seed share from which you can conclude to lower contents of oil and thus to a quality diminishing.