Direct and residual effect of foliar applications of copper and manganese on cottonseed yield and quality

• Published in: Journal of agricultural and food chemistry 1993-10, Vol.41 (10), p.1756-1759
• Main Authors: Sawan, Zakaria M, Basyony, Ahmad E, McCuistion, Willis L, El Farra, Abdel Hamid A
• Format: Article
• Language: English
• Subjects: ABONOS DE OLIGOELEMENTOS; ACEITE DE ALGODON; APLICACION FOLIAR; APPLICATION FOLIAIRE; CALIDAD; CHELATEUR; COBRE; CUIVRE; DATE DE TRAITEMENT; DOSE D'APPLICATION; DOSIS DE APLICACION; ENGRAIS A OLIGOELEMENTS; FECHA DE TRATAMIENTO; GOSSYPIUM BARBADENSE; GRAINE DE COTON; HUILE DE COTON; MANGANESE; MANGANESO; PROTEINAS VEGETALES; PROTEINE VEGETALE; QUALITE; QUELATOS; RENDEMENT DES CULTURES; RENDIMIENTO DE CULTIVOS; SEMILLA DE ALGODON
• ISSN: 0021-8561; 1520-5118
• DOI: 10.1021/jf00034a044

In 1986-1987 field experiments at Giza, Egypt, cotton cv. Giza 75 was given foliar application of the micronutrients copper and manganese (Cu at 0.0, 12.5, 25.0, and 37.5 ppm and Mn at 0.0, 25.0, and 50.0 ppm) applied at 85 and 105 days after sowing. Individual Cu or Mn applications increased cottonseed yield and seed index above those of the control (0.0 Cu, 0.0 Mn). Cu at 37.5 ppm with Mn at 50 ppm gave the highest seed oil content. Highest oil and protein yields resulted from Cu and Mn at 25 ppm, when applied separately, while oil refractive index, and iodine value increased from Cu and Mn added separately or in combination. Unsaponifiable matter increased as a result of almost all treatments. All Cu or Mn treatments, applied either separately or in combination, generally decreased saturated fatty acids (myristic, palmitic, and stearic) and increased unsaturated fatty acids (palmitoleic, oleic, and linoleic). Cu at 12.5 ppm or Mn at 25 ppm gave the lowest levels of saturated fatty acids