Physiological and chemical response of sunflower to some organic nitrogen sources and conventional nitrogen fertilizers under sandy soil conditions [electronic resource].

Includes reference.

Two sunflower (Helianthas annus L. cv. Vidoc hybrid) field experiments were performed in EI-Khattara region (Sharkia Govemorate, Egypt) during 2005 season to study the effect of organic-N sources and their combination as well as to compare the effect of organic sources and ammonium sulfate (A.S.) as a conventional fertilizer added individually or in combinations on growth, yield components, oil percentage as well as uptake of some macronutrients by plant grown on a sand soil. The organic sources were farmyard manure (FYM), chicken manure (Ch.M) and palma residues (Pa.R): Ch.M and (FYM + Ch.M of 1/1 ratio of added N) were superior to the other treatments and gave the highest yield, dry matter yield. NPK uptake by plant at all growth stages as well as seed yield at maturity stage. The promotive effect of the different organic sources of nitrogen on the yield and its components may follow the order: Ch.M> Pa.R> FYM. This was more emphasized when the materials were mixed with ammonium sulfate at the ratios of 3/1 and 1/1 organic source N / A.S-N Uptake of N, P and K by sunflower plants was affected by the addition of different nitrogen sources and nitrogen addition treatments. The highest nutrient content and uptake by straw were obtained when treated with Ch.M followed by Pa.R at all growth stages. While it was Pa.R foIIowed by Ch.M for seeds. The oil content was shown to respond to N supply hut the changes in individual fatty acids were not statistically different.

Summary in Arabic.

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