Response of Dahlia pinnata to different levels of nitrogen alone and in combination with constant doses of phosphorus and potassium
2007
Khan, G.A. (NWFP Agricultural Univ., Peshawar (Pakistan). Dept. of Horticulture) | Sajid, M. (NWFP Agricultural Univ., Peshawar (Pakistan). Dept. of Horticulture) | Zubair, M. (NWFP Agricultural Univ., Peshawar (Pakistan). Dept. of Horticulture) | Noor-ul-Amin (NWFP Agricultural Univ., Peshawar (Pakistan). Dept. of Horticulture)
Response of different nitrogen levels (0, 15, 20, 25 and 30 g/sq.ft.) alone and in combination with constant doses of phosphorus and potassium on the growth of Dahlia pinnata was studied at Malakandher Horticultural Farm, NWFP Agricultural University, Peshawar during 1997-98. The experiment was laid out in Randomized Complete Block design. There were 20 treatments with three replications. The fertilizer treatments significantly affected the days to flowering, number of flowers/plant, plant height, number of leaves per plant, primary root length, leaf area, and root stem ratio. A maximum day to flowering (123) was recorded with 30g N, while a minimum day to flowering (91) was noted with 15 g P. The highest number of flowers/plant (13), plant height (106.3 cm), primary root length (17 cm) were observed in plants supplied with 25g N+ 15g P+ 15g K. Maximum number of leaves/plant (71), leaf area (27 cm2) and root and stem ratio (0.75 ) was recorded in plants receiving 25 g N only. For the Dahlia growers 25g N+ 15g P+ 15g K/sq.ft. is recommended under the agro-climatic condition of Peshawar.
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