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Pak. J. Bot., 42(4): 2513-2521, 2010. |
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Updated: 09-12-10 |
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GROWTH, YIELD AND NITRATE ACCUMULATION OF IRRIGATED CARROT AND OKRA IN RESPONSE TO NITROGEN FERTILIZATION
M. MUBASHIR1*, S.A.MALIK1, A.A. KHAN1, T.M. ANSARI2, S. WRIGHT3, M.V. BROWN3 AND K.R. ISLAM4
Abstract: A randomized block experiment conducted on Sultanpur silt loam evaluated the N effects on growth and nitrate accumulation of okra (Hibiscus esculents L. cv. Sabz pari) and carrot (Daucus carota L. cv. T29). Treatments consisted of a control, 100, 150 and 200 kg N ha-1. Significantly higher yields of carrot and okra were recorded at 150 kg N ha-1. Nitrate concentration in both increased (> 35 to 200%) with increasing N. An excessive nitrate accumulation in both was recorded at 200 kg N ha-1. Okra had 1.7 times higher nitrate accumulation than carrot. Early season okra had a significantly higher nitrate (~10%) than late season. Gross income and profitable return responded quadratically with increasing N. Results suggest that N fertilization of carrot and okra at 150 kg N ha-1 is optimum for economical yields with less accumulation of nitrate in vegetables.
1Institute of Pure & Applied Biology, B.Z. University, Multan, Pakistan 2Department of Chemistry, B.Z. University, Multan, Pakistan 3The Ohio State University South Centre, 1864 Shyville Road, Piketon, OH 45661, USA. |
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