EFFECT OF IRRIGATION INTERVALS FLOWERING AND NITROGEN FERTILIZER LEVELS ON GROWTH CHARACTERS AND YIELD IN COTTON( Gossypium hirsutum L.)

Abstract

Field experiment was carried out in Diyala during growing season 2008 , to investigate the effect of three irrigation date (17،14،21،Day( after flowering and two Levels of Nitrogen ( 100،200 kgN .h-1 ) on growth characters and yield and yield component of cotton (var .lashata ) . The experimental design was randomized complete block design in factorial experiment with three replications . The results were as follows:

1.The irrigation date at21 day gave higher percentage of plant height (43.55%) number of nodes ( 44.85 % ) ,leaf area ( 55.44 % ) ,leaf number ( 42.86 % ) as compared with irrigation date at 7 days , an gave length of inter nodes (5.47 cm ) , number of sympodia branch per plant ( 27.78 ) compared of irrigation date 7 days (5.40 cm ،13.94 branch ) respectively, and gave higher percentage of cotton yield (68.20% ) as compound of irrigation date 7 days . 2. High level of nitrogen with 200 kgN .h-¹ .gave higher percentage of plant height(11.38%),number of nodes (18.56%),length of inter nodes(6.56%), leaf area (62.35%), leaf number (38.06%), number of sympodia branch per plant (69.08%), and cotton yield ( 84.39 % ) as compared of application ( 100kgN . h-¹). 3.Significant interaction were observed between irrigation date at 21 and Nitrogen applied at (200 kgN .h-1 ) in all studied characters .