Vol: 40 Page: 25

Authors:
Wiesław Pilarczyk
Anna Fraś

Title:
 On the precision of winter rape variety testing trials in Poland

Language: English

Keywords:
confidence bounds
least significant difference
trial precision
variety testing
winter rape

Summary:
Winter rape is an important crop in Poland. So every new variety before listing in National List is carefully examined by The Research Centre for Cultivar Testing. The performance of varieties is checked in numerous VCU (value for cultivation and use) trials performed at experimental stations characterized by different soil and climatic conditions. Winter rape is very sensitive to extreme climatic conditions, e.g. frost in winter and drought periods in vegetation season. Such factors influence not only the performance of individual varieties but also overall precision of trials. Precision is often identified with the average value of the least significant difference expressed in percents of the general mean (LSD%). The precision of VCU trials on cereals in Poland has been reported in the papers by Pilarczyk (1987, 2008) and by Pilarczyk and Fraś (2008). In this research, using similar methodology, the precision of winter rape trials is investigated using extensive data from trials performed in the period between 2006 and 2008.

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