Effect of irrigation intervals and nitrogen fertilization on growth, yield and chemical composition of Ricinus communis L. under north Sinai conditions
2011
Dawood, T.I.M.
This experiment was conducted during 2004/2005 and 2005/2006, at the field experimental and laboratories of North Sinai Research Station, Desert Research Centre, at EI-Sheikh Zowayed, to investigate the effect of irrigation intervals (10, 15,30) days and rainfed irrigation and nitrogen fertilization rates of ammonium sulphate (20..5% N) at four rates of (0, 100, 200, and 300) kg/fed./year on plant growth, yield, fixed oil production and chemical composition of Ricinus communis, L. The obtained results could be summarized as follows: Irrigation interva1s had a significant effect on vegetative growth, yield and chemical composition parameters (plant height (cm), stem diameter (mm), number of branches/plant, fresh and dry weights/plant (gm), number of inflorescences, number of seed/ plant, seed yield/plant, seed index and seed yield/fed, fixed oil yield/ plant and per feddan, chlorophyll a, b and carotenoids, total carbohydrates, nitrogen, phosphorus and potassium percentages in leaves, stems and roots) Plants irrigated every 10 days produced the highest values in both two seasons. Nitrogen fertilization at all rates had a significant effect 0n plant height, branches/ plant, fresh and dry weights/ plant, number of inflorescences, number of seeds, seed index, seed yield/ plant and per feddan, fixed oil percentage, oil yield/ plant and per feddan, chlorophyll a, b and carotenoids, total carbohydrates, N, P and K contents in leaves, stems and roots. The interaction between irrigation intervals and nitrogen fertilization had a significant effect on vegetative growth parameters. lnteraction between irrigation every 10 days and fertilized with N at the rate of 300 kg/fed of ammonium sulphate (20.5% N) was the most effective treatment which gave the highest values in most parameters studied.
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