ABOU-ZEID, H., ABDEL-AAL, S., ABDEL-MALIK, R. (1997). EFFECT OF POTASSIUM SULPHATE APPLICATION METHODS AND TIMING ON GROWTH AND PRODUCTIVITY OF THE COTTON CULTIVAR GIZA 77. Egyptian Journal of Agricultural Research, 75(2), 495-503. doi: 10.21608/ejar.1997.405161
HAMDY M. ABOU-ZEID; SAMY A. I. ABDEL-AAL; ROSHDY R. ABDEL-MALIK. "EFFECT OF POTASSIUM SULPHATE APPLICATION METHODS AND TIMING ON GROWTH AND PRODUCTIVITY OF THE COTTON CULTIVAR GIZA 77". Egyptian Journal of Agricultural Research, 75, 2, 1997, 495-503. doi: 10.21608/ejar.1997.405161
ABOU-ZEID, H., ABDEL-AAL, S., ABDEL-MALIK, R. (1997). 'EFFECT OF POTASSIUM SULPHATE APPLICATION METHODS AND TIMING ON GROWTH AND PRODUCTIVITY OF THE COTTON CULTIVAR GIZA 77', Egyptian Journal of Agricultural Research, 75(2), pp. 495-503. doi: 10.21608/ejar.1997.405161
ABOU-ZEID, H., ABDEL-AAL, S., ABDEL-MALIK, R. EFFECT OF POTASSIUM SULPHATE APPLICATION METHODS AND TIMING ON GROWTH AND PRODUCTIVITY OF THE COTTON CULTIVAR GIZA 77. Egyptian Journal of Agricultural Research, 1997; 75(2): 495-503. doi: 10.21608/ejar.1997.405161
EFFECT OF POTASSIUM SULPHATE APPLICATION METHODS AND TIMING ON GROWTH AND PRODUCTIVITY OF THE COTTON CULTIVAR GIZA 77
Cotton Research Institute, Agricultural Research Centre, Giza, Egypt
Abstract
Two K-field experiments were conducted at Sakha Agric Res. St., Kafr El-Sheikh Governorate during 1993 and 1994 seasons to study the response of Giza 77 cotton cultivar to foliar and soil applications of potassium sulphate and its timing. The treatments included unfertilized check, soil application; before sowing, after thinning, and at early blooming, foliar feeding 2 weeks after early bloom, soil application after thinning + foliar feeding 2 weeks after early bloom. Soil application was done using 24 kg K20/fed., while foliar feeding was carried out with K2SO4 solution (1%K20). Results indicated the positive effect of potassium sulphate when it was applied at the proper time as soil application after thinning which resulted in taller plants with higher number of fruiting branches, less number of vegetative branches, higher boll retention, heavier bolls as well as high seed cotton yield per plant and per feddan and lint percentage. The benefit from foliar application of K-solution 2 weeks after 1st bloom was realized, specially when it was applied as a supplementary feeding combined with soil application after thinning. Potassium fertilization showed no effect on seed index.
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