Influence of lodging and nitrogen rate on the yield and yield attributes of oilseed rape (Brassica napus L.)
1994
Islam, N. | Evans, E.J. (Newcastle Upon Tyne Univ. (United Kingdom). Dept. of Agriculture)
The effects of lodging and nitrogen rate were studied in a field trial of oilseed rape Brassica napus L. Lodging decreased seed yield (16%) compared with a frame-raised crop. Yield decreased because of a significant reduction in each of the yield components coupled with a reduced plant population caused by stem breakage at the ground level. Lodging also reduced the final crop dry weight and harvest index. Seed yield was also lower when 200 kg per ha nitrogen was applied than with 400 kg per ha. A general decrease in pod number per pod, seed number per square metre and seed weight caused the lower yields. The use of 400 kg per ha of nitrogen changed the contribution of the terminal raceme and individual branches with respect to seed yield. Seed nitrogen content and nitrogen yield increased at the 400 kg per ha, lowering both seed oil content and oil yield.
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