Morphophysiological studies on Egyptian cotton plants (gossypium barbadense l.): 2-Effect of plant growth regulators and micronutrients on flowering and boiling characteristics, yield, and yield components [electronic resource].

Includes references.

The present investigation was carried out at Faculty of Agriculture Farm, during 1999 and 2000 growing seasons, Department of Agric. Botany, Faculty of Agriculture, Kafr El-Sheikh, Tanta University. The main objective of this investigation is: to study the effect of foliar spraying of the three PGRs i.e., Pix, kinetin and Morphactin .with two concentrations for each one (low and high) and three micronutrients i.e., iron (Fe), zinc (Zn) and manganese (Mn) with one concentration for each one, and their combinations; on flowering and boiling characteristics ,yield and yield components. The cotton cultivar was devoted in this study is Giza 86 an Egyptian long-staple. The main obtained results may be summarized as follows: Pix applications resulted in lower number of total flowers/plant compared to kinetin or morphactin applications. Pix at high concentration (2000 ppm) significantly reduced number of open bolls/plant and· decrease boll retention compared to the control. Pix applications significantly reduced both seed cotton yield and lint cotton yield in kentars/feddan compared to the control.. Pix applications (1000 and 2000 ppm) significantly reduced lint percentage compared to the control. Kinetin and Morphactin applications significantly increased the total number of flowers/plant, total number of open bolls/plant,and boll retention compared to the control.. Also Kinetin and morphactin applications significantly increased seed cotton yield and lint cotton yield in kentars/feddan. lint percentage was significantly increased by morphactin and kinetin applications.

Summary in Arabic.

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