الفهرس 
Growth analysis and attributesOnly 14 pages are availabe for public view
 |  | from | 180 |  |  |
| | | from | 180 | | |
Abstract
Part I:- Effect of M application frequency and levels Two experiments were undertaken t o study the e f f e c t of nitrogen application frequency and l e v e l s on growth analysis and a t t r i b u t e s and its components and quality of two wheat c u l t i v a r s . A s p l i t - s p l i t plot design with four r e p l i c a t e s w a s c:i used where the rn&n plots were designated t o c u l t i v a r s (Sakha 8 and Sakha 69), the subplots -to N application frequency: 1) single s p l i t 2)two equal s p l i t s 3) three equal s p l i t s , and the sub-sub plots to t h e t h r e e nitrogen l e v e l s (50,70 and 90 lcg/fed.). The sowing date w a s 29 and 27 November i n the two seasons. The r e s u l t s obtained can be surnrrlarized as follow:- A..- ..G..r.o.w.t.h. .a..n.a.l.y..s.i.s. .a.n.d.. .a.t.t.r.i.b. u t e s : - A-1. Dry matter accumulation: - In both seasons, the two c u l t i v a r s showed similar trend i n t h e i r dry matter accumulation i n the Iirst and second growth stages while i n the t h i r d and fourth stages Sakha 69 w a s superior i n dry matter accumulation compared with Sakha 8 cultivar; The e f f e c t of s p l i t t i n g I\: on dry matter accumulat i o n were s i g n i f i c a n t i n a l l stages except at the age of 107 days i n the two seasons. Applying N i n two equal s p l i t s increased dry weight per p l a n t . A t a l l growth stages, t h e e f f e c t of N l e v e l s on dry matter accumulation were s i g n i f i c a n t i n both seasons# Generally increasing N level increased dry matter accumulation value. In both seasons, none of the i n t e r a c t i o n s w a s significant except a-i: age of 87 days where s i g n i f i c a n t e f f e c t N application frequency and l e v e l s and at 97 days age between c u l t i v a r s and N l e v e l s . A-2. Dry matter d i s t r i b u t i o n :- Both c u l t i v a r s showed similar trend i n t h e i r dry matter d i s t r i b u t i o n among d i f f e r e n t organs. Also, Sakha 69 c u l t i v a r surpassed Sakha 8 i n leaves percentage at the f i r s t growth stage, stem percentage at the t h i r d and fourth stages and spike--percentage at fourth stage. bet ween Applying N i n 2 eqaal s p l i t s gave significa~tlya increase in dry matter d i s t r i b u t i o n f o r leaf percentage at a l l growth stages except the t h i r d stage, stem percentage at the second and fourth stages and spike percentage at the fourth stage. Nitrogen l e v e l s affected s i g n i f i c a n t l y l e a f percentage i n the f i r s t and second growth stages and stem and spike percentaze i n the fourth stage, it w a s increased with increasing K level. None of t h e i n t e r a c t i o n s was s i g n i f i c a n t , i n both seasons. A-3, Plant height : - The differences between c u l t i v a r s i n plant height were s i g n i f i c a n t i n both seasons where, Sakha 63 plants were taller than Sakha 8, except at the age of 87 days i n the f i r s t year. S p l i t t i n g N gave no s i g n i f i c a n t increase i n plant height i n the two seasons except, at the age of 97 days where applying N i n two equal s p l i t s gave the highest value. In both seasons, increasing 11: l e v e l ..enhamed plant height s i g n i f i c a n t l y and none of the interactions; was s i g n i f i c a n t . A-4. Leaf area:- The differcnces between cultivars i n leaf area were s i g n i f i c a n t i n the f i r s t and second stages, where Sakha 69 c u l t i v a r gave higher values f o r leaf a r e a t h a n