Some technological characteristics and yield of some cotton varieties as affected by application of urea ammonium nitrate, sulphur and phosphorein [electronic resource].

Includes references.

Two field experiments were carried out in farmer fields during 2003 and 2004 summer seasons at 5herbeen, Dakhalia governorate to study the effect of UAN (Urea ammonium nitrate, 32% N), agric. SUlphur (5) and phosphorien (Biofertilizer) application under recommended dose of NPK fertilizers (70 N + 30 PzOs + 24 KzO kg fed⁻¹) on cotton plant growth, seed cotton yield, lint percent, oil content of seeds and protein content of kernel seeds of the Egyptian cotton varieties Giza 86, G. 87, G. 88 and G. 89.The resuits indicated that: 1. The highest seed cotton yieldfed was realized from all varieties by foliar UAN application under recommended dose of NPK (70 N + 30 P₂O₅⁻¹ + 24 K₂O kg fed⁻¹). 2. Using phosphorien, UAN and S with NPK (70 N + 30 P₂O₅+ 24 K₂O kg fed⁻¹) increased lint percent, plant height, No. of open bolls/plant, seed index and boll weight in four cotton varieties. 3. The study showed the vital Importance of soil analysis, which indicated low le'lels of available N, P, K and 5 and the soil must be fertilized with the economically beneficial amounts of these nutrients when cropped with cotton, 4. Protein, oil content in seeds and N, P and S contents fully developed leaves at the beginning of flowering stage and were increased by using UAN, phosphorien and 5 treatments application. 5. These clearly concluded' that UAN, phosphorien and S treatments could be used With NPK (70 N + 30 P₂O₅⁻¹ + 24 K₂O kg fed⁻¹) under the Egyptian conditions as effective for improving seed cotton yield and quality of cotton varieties Giza 86, G. 87, G. 88 and G. 89. Meanwhile, these treatments lowered soil pH which resulted In increasing th availability of some nutrients as P and S In soii.

Summary in Arabic.

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