ALI, S., EL-SAYED, E. (2001). EFFECT OF SOWING DATES AND NITROGEN LEVELS ON GROWTH, EARLINESS AND YIELD OF EGYPTIAN COTTON CULTIVAR GIZA 88. Egyptian Journal of Agricultural Research, 79(1), 221-232. doi: 10.21608/ejar.2001.397369
SEIF A. ALI; EZZAT A. EL-SAYED. "EFFECT OF SOWING DATES AND NITROGEN LEVELS ON GROWTH, EARLINESS AND YIELD OF EGYPTIAN COTTON CULTIVAR GIZA 88". Egyptian Journal of Agricultural Research, 79, 1, 2001, 221-232. doi: 10.21608/ejar.2001.397369
ALI, S., EL-SAYED, E. (2001). 'EFFECT OF SOWING DATES AND NITROGEN LEVELS ON GROWTH, EARLINESS AND YIELD OF EGYPTIAN COTTON CULTIVAR GIZA 88', Egyptian Journal of Agricultural Research, 79(1), pp. 221-232. doi: 10.21608/ejar.2001.397369
ALI, S., EL-SAYED, E. EFFECT OF SOWING DATES AND NITROGEN LEVELS ON GROWTH, EARLINESS AND YIELD OF EGYPTIAN COTTON CULTIVAR GIZA 88. Egyptian Journal of Agricultural Research, 2001; 79(1): 221-232. doi: 10.21608/ejar.2001.397369
EFFECT OF SOWING DATES AND NITROGEN LEVELS ON GROWTH, EARLINESS AND YIELD OF EGYPTIAN COTTON CULTIVAR GIZA 88
Cotton Research Institute, Agricultural Research Center, Giza, Egypt
Abstract
Two field experiments were carried out at Sakha Agricultural Researech Station on the Egyptian cotton cultivar Giza 88 during 1998 and 1999 seasons to study the effect of sowing dates (25 March, 10 and 25 April) and N-levels (40, 60 and 80 kg/fed.) on growth, earliness and yield of cotton. Split-plot design with four replications was used. Results obtained revealed that early sowing (25 March) had significantly increased number of internodes and sympodia on the main-stem, number of open bolls per plant, boll weight, seed index, lint percentage, number of days to the first flower appearance, days to crack the first boll and earliness percentage and seed cotton yield, per plant and feddan, while plant height, internode length, number of monopodial branches, number of true leaves at 80 days age, first sympodium position and stand of plant at harvest were decreased. On the other hand, increasing nitrogen levels up to 80 kg/fed. had significantly increased plant, length and number of internodes on the main stem, number of monopodia and sympodia per plant, number of true leaves at 80 days age, weight and number of open bolls/plant, seed index and seed cotton yield per plant and feddan. On the contrary, higher N. levels delayed the appearance of first flower, cracking the first boll, produced the 1st sympodium on higher mode and decreased earliness percentage. The interaction between sowing dates and N. levels had no significant effect on all traits in this study except the number of open bolls/plant in the first season. Best results were obtained when cotton plants were sown early (25 March) and fertilized with 80 kg N/fed. While in case of late sowing (25 April) the nitrogen level reduced to 40 kg/feddan. In general, it could be concluded that early sowing gave the proper yield per feddan than the late planting.
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