MORPHOLOGY YIELD AND SEED QUALITY OF RAPESEED (Brassica campestris L.) AS INFLUENCED BY NITROGEN AND ZINC

Abstract

The experiment was undertaken during rahi season. November 2011 to February 2012 to examine the response of different levels of nitrogen and zinc application on morphology yield and seed quality of rapeseed (Brassica campesiris L.) variety BARI Sarisha 15. In this experiment, the treatment consisted of four different N levels viz. No = 0 kg N/ha, N1 = 60 kg N/ha, N2 = 120 kg N/ha and N3= ISO kg N/ha, and three different level of Zn viz. Zn0 = 0 kg/ha. Zn1= 1 kg Zn/ha. Zn, =2 kg Zn/ha. The experiment was laid out in two factors Randomized Complete Block l)esign (RCBD) with three replications. Results of the experiment showed a significant variation among the treatments in respect of the majority of the observed parameters. The 120 kg N/ha resulted the highest plant height, number of leaves per plant, number of branches per plant, length of inflorescence, number of siliquae per plant, seed weight of hundred siliquae, thousand seed weight. The maximum yield of seed per hectare (3.57 t) was obtained from 120 kg N/ha. The maximum number of siliquae per plant, seed weight of hundred siliquae. thousand seed weight, seed yield (3.31 tiha) was recorded with 2 kg Zn/ha. Separately, application of Zn did not show signiFicant difference on morphological parameters such as plant height, number of leaves per plant and length of inflorescence as N. In addition, oil content of rapeseed varied significantly with both N and Zn independently whereas germination percent had no effect with either N or Zn. These results indicated that N has role on both vegetative and reproductive phases but Zn only on reproductive phase. The interaction between different levels of N and Zn was significantly influenced on almost all morphological parameters and yield contributing characters, seed yield and oil content. The maximum value of morphological parameters, yield contributing characters, seed yield of rapeseed was observed with the combined dose of 120 kg N/ha along with 2 Kg Zn/ha whereas the lowest values were obtained from control. 0 kg N/ha and 0 kg Zn/ha treatment combination. The maximum yield of seed per hectare (4.22 tones) and the maximum oil content (43.29%) was obtained from 120 kg N/ha with 2 Kg Zn/ha treatment combination. Based on the present results, it can be suggested that the combined use of 120 kg N/ha with 2 kg Zn/ha increased plant morphological parameters, seed yield and oil content of rapeseed.