Production potential of rapeseed (brassica napus l) as influenced by different nitrogen levels and shoot cutting under the agro-climatic condition of swat-pakistan

An experiment entitled “production potential of rapeseed (brassica napus l) cultivar as influenced by different nitrogen levels and shoot cutting under the agro-climatic condition of swat-Pakistan was conducted at Agriculture Research Institute (N) Mingora (Swat) during Rabi season 2012-13. The field experiment was carried out in randomized complete block design (RCBD) having four replications. The sub plot size was kept 5m x 2.7m having 6 rows with 0.45 m apart. Four levels of nitrogen (0, 33, 66 and 100 kg ha-1) and five levels of shoot cuting (no cut, 5cm, 10, 15 and 20 cm) were used in the experiment (cv Oscar). Recommended dose of Phosphorus in the form of SSP were applied at the rate of 60 kg ha-1respectively. From the results it is observed that rapeseed cultivar positively responded for seeds pod-1, thousand seed weight (g), biological yield (kg ha-1), seed yield (kg ha-1) and oil yield (kg ha-1) to N levels and maximum seeds pod-1 (23 seeds), thousand seed weight (3.59 g), biological yield (10310 kg ha-1), seed yield (1169 kg ha-1) and oil yield (600 kg ha-1) was observed in plot treated with 100 kg N ha-1. Whereas minimum seeds pod-1 (15 seeds), thousand seed weight (2.41 g), biological yield (6725 kg ha-1), seed yield (923 kg ha-1) and oil yield (401 kg ha-1) was recorded in control plot. Similarly highest seeds pod-1(22), thousand seed weight (3.3 g), seed yield (1099 kg ha-1) was noted in no cut applied plot followed by 20 cm cut plot while promising biological yield (9025 kg ha-1), and oil yield (568 kg ha-1) was recorded in 15 cm and 20 cm cut treated plot. On the basis of the result it is concluded that shoot cutting with 100 kg N ha-1 produced highest seed and oil yield with green chop and recommended for higher seed, oil and biological yield in the agro- climatic condition of swat valley.