ASSY, K., ABDEL-MALAK, K. (1997). RESPONSE OF THE EGYPTIAN COTTON CULTIVAR GIZA 83 TO NITROGEN RATES AND TIME OF APPLICATION UNDER DIFFERENT SOWING DATES. Egyptian Journal of Agricultural Research, 75(4), 1097-1112. doi: 10.21608/ejar.1997.426491
KAMEL G. ASSY; KARM K. I. ABDEL-MALAK. "RESPONSE OF THE EGYPTIAN COTTON CULTIVAR GIZA 83 TO NITROGEN RATES AND TIME OF APPLICATION UNDER DIFFERENT SOWING DATES". Egyptian Journal of Agricultural Research, 75, 4, 1997, 1097-1112. doi: 10.21608/ejar.1997.426491
ASSY, K., ABDEL-MALAK, K. (1997). 'RESPONSE OF THE EGYPTIAN COTTON CULTIVAR GIZA 83 TO NITROGEN RATES AND TIME OF APPLICATION UNDER DIFFERENT SOWING DATES', Egyptian Journal of Agricultural Research, 75(4), pp. 1097-1112. doi: 10.21608/ejar.1997.426491
ASSY, K., ABDEL-MALAK, K. RESPONSE OF THE EGYPTIAN COTTON CULTIVAR GIZA 83 TO NITROGEN RATES AND TIME OF APPLICATION UNDER DIFFERENT SOWING DATES. Egyptian Journal of Agricultural Research, 1997; 75(4): 1097-1112. doi: 10.21608/ejar.1997.426491
RESPONSE OF THE EGYPTIAN COTTON CULTIVAR GIZA 83 TO NITROGEN RATES AND TIME OF APPLICATION UNDER DIFFERENT SOWING DATES
1Soil and Water Research Institute, Agricultural Research Centre, Giza, Egypt
2Cotton Research Institute, Agricultural Research Centre, Giza, Egypt
Abstract
This investigation was carried out at Malawi Agricultural Research Station, Minis Governorate, during 1994 and 1995 seasons to study the effect of timing and rates of nitrogen application under different sowing dates on the yield and its components of Giza 83 cotton cultivar. Data obtained revealed that early sowing at mid March significantly increased seed cotton yield either per plant or per feddan, lint percentage and seed index, while final plant height and plant stand at harvest were significantly increased in favour of late sowing date at last week of April. Nitrogen application at equal doses before the second and third irrigation significantly increased number of sympodia per plant, open bolls, seed cotton yield per plant and per feddan, while final plant height, boll weight, lint percentage and seed index were slightly affected by application timing. Increasing nitrogen level from 50 to 100 kg N/fed significantly increased final plant height and yield components per plant, while boll weight, lint percentage and seed index were slighty affected. Seed cotton yield/fed was insignificantly increased by increasing nitrogen-levels from 75 to 100 kg N/fed. The interaction of sowing dates and nitrogen levels or the inter-action of application timing and nitrogen levels had significant effect on yield components per plant and yield per feddan, while sowing dates and nitrogen application timing interaction did not reach the level of significance. For early sown plants, at mid March, 75 kg N/fed applied at equal doses before the second and third irrigations produced the higher yield of cotton. For late sown plants at last week of April, 45 kg N/fed applied early in three doses before the first, second and third irrigations pro-duced the highest yield of seed cotton per feddan_
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