Comparative study on the effects of chemical fertilizers (N, P, K, S and Zn) on growth and productivity of Canola (Brassica napus L) in Mazandaran, northern Iran

摘要

To investigate the effects of chemical fertilizers on the yield, yield components and seed oil content of canola (Brassica napus. L), a split-plot experimental design with 10 treatments in 4 replications was carried out at the Baiecola Agricultural Research Station in the Mazandaran province. During the growing season of 2004- 2005, compounds of N, P, K, NP, NK, PK, NPK, NPKS, and NPK Zn were deployed as chemical fertilizers. The highest seed yield of 3141.250 kg/ h, i.e. 326.61 % increase over the control was obtained by treatment no.10 (T_(10)=NPK Zn) at which the highest TDM was simultaneously obtained (7098 kg/h, giving 65.82 % increase over the control). The highest number of pods per plant (203 pods/plant) i.e. a 91.16% increase over the control was achieved also at T_(10) along with the highest number of seeds per pod (25.88 seeds/pod), giving 11.21 % increase over the control. This was accompanied by a significant increase in the number of branches and the 1000 grain weight. The maximum canola oil content obtained at T_(10) (45.83 %) showed a 9.53 % increase over the control.