Effects of sowing date and the N dose before sowing on the winter hardiness and yield of winter swede rape varieties
Budzynski, W.; Majkowski, K.; Horodyski, A.; Jasinska, Z.; Musnicka, B.; Snarski, A.
Biuletyn Instytutu Hodowli i Aklimatyzacji Roslin 156: 113-130
The varieties Gorczanski, Wipol and Janpol, representing respectively groups with high, low and zero contents of erucic acid in the oil, were compared in 3 years of field trials in 3 different parts of Poland. Overall, Gorczanski was the hardiest and produced the highest seed and oil yields. Neither sowing date nor the N dose before sowing affected hardiness significantly, but at all sites late sowing reduced both seed and oil yields.