Yield and oil response of linseed (Linum usitatissimum L.) to nitrogen application
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Abstract
The finding revealed that there was highly significant (P<0.01) difference of the main effect of linseed variety on biomass yield, seed oil yield were highly significant (P<0.01) for the main effect of nitrogen fertilizer level. While, percent oil content of seed was significantly (P<0.05) influenced by interaction effect of both factors. Thus, the highest (8846 kg ha-1) and lowest (7090 kg ha-1) biomass yield and the maximum (1964 kg ha-1) and minimum (1132 kg ha-1) seed yield were obtained from application of 46 kg N ha-1 and control, respectively with 83.2% advantage. However, the highest percent seed oil content (38.3%) was obtained from Bekoji-14 variety with control and the lowest (35.1%) were obtained from Kulumsa-1 with 46 kg N ha-1 interaction effect, this indicating the oil content declined at higher nitrogen rate. The maximum and minimum seed oil yield was obtained from 46 kg N ha-1 (695.9 kg ha-1) and control treatment (422 kg ha-1, respectively. Kulumsa-1 variety was the best performance for studied characters. Regression analysis of linseed variety and nitrogen fertilizer rate on seed yield showed a positive linear response implying an increasing trend at every amount of treatment added while in contrast the regression line for percent seed oil content was linear negatively declined. The result revealed that maximum net benefit of 60,097 EB (Ethiopian Birr) ha-1was obtained from application of 46 KgN ha-1 and Kulumsa-1 or Bekolji-14 with marginal rate of return of 6866% as economically profitable in the study area
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