Response of sunflower (Helianthus annuus L.) to potassium and micronutrients fertilization under drip irrigation in sandy soil [electronic resource].

Includes references.

Two field experiments were carried out in the Experimental Farm, El-Khattara, Faculty of Agriculture, Zagazig University, Sharkia Governorate, Egypt during two summer successive seasons (2007 and 2008). The experiments aimed to study the effect of potassimn fertilizer levels (0, 24 and 48 kg K₂O per fad.) and micronutrients foliar application (control, Fe, Zn, Mn, Fe + Zn + Mn) on yield and it's attributes of sunflower cultivar Sakha 53, under drip irrigation system in sandy soils. Micronutrients foliar application had significant effects on stem diameter, number of seeds /head, seed weight, seed oil percentage, seed and oil yields/fad.,but both plant height and head diameter were not significantly influenced by the applied treatments. Zn application either sole or in combination with Fe + Mn, caused significant increase in stem diameter, number of seeds per head, seed head weight, seed and oil yields/fad., compared with other micronutrient treatments (combined analysis). The increase ofK level up to 48 kg K₂O per fad., significantly increased the aforementioned characters in both seasons and their combined analysis.

Summary in Arabic.

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