Effect of 1-naphthalene acetic acid concentrations and the number of applications on the yield components, yield and fibre properties of the Egyptian cotton (Gossypium barbadehse L.)
Year: 1998
Type: article
Abstract: Field experiments were performed in two successive seasons at the Experimental Station, Faculty of Agriculture, Cairo University, Giza, Egypt, on the Egyptian cotton cultivar Giza 75 (Gossypium barhadense L.).Cotton plants were sprayed with the growth regulator 1-naphthalene acetic acid (NAA) once (90 days after planting (DAP)), or twice (90 and 105 DAP) or three times (90, 105 and 120 DAP), during the square and boiling stage).The concentrations 5, 10, 15, 20 or 25 ppm were used.The volume of solution was the same for all treatments, 960 L•ha -1 .The control plants were sprayed with water only.The effect of the previous treatments on yield components, cotton yield and fibre properties was studied.The application of NAA increased the number of opened bolls/plant, boll weight, seed index, seed cot- ton yield/plant and seed cotton and lint yields•ha -1 .The most significant effects were obtained with the 15 and 20 ppm concentrations, when each was applied twice.Lint percentage, fibre length parameters and micronaire value were not significantly affected by NAA.Flat bundle strength was significantly affected by NAA but with no consistent trend.The application of NAA twice or three times tended to give the best results on yield components and cotton yield compared with a single application.The results of this study suggested that 20 ppm of NAA gave the best figures when applied twice on the Egyptian cotton plants.(© Inra/Elsevier, Paris.)growth regulator / NAA-concentrations / cotton yield / fibre properties Résumé -Effet des concentrations de l'acide 1-naphtalène-acétique et du nombre d'applications sur les composantes du rendement et les propriétés des fibres du coton égyptien (Gossypium barbadense L.).Des essais sur le terrain ont été effectués durant deux saisons successives à la station de recherches de la faculté d'agronomie de l'univer- Communicated by Gérard Guyot (Avignon)
Source: Agronomie
Authors: Zakaria Mohamed Sawan, Ramadan Arafa Sakr
Language: English
Subfield: Plant Science
Domain: Life Sciences
SDG: Zero hunger
Open Access status: bronze
OpenAlex ID: W2116455488