study of nitrogen fertilizer effect on nitrogen harvest index (nhi) and corn yield

نویسندگان

غلام عباس اکبری

استادیار گروه زراعت و اصلاح نباتات، پردیس ابوریحان، دانشگاه تهران، پاکدشت عبداله قاسمی پیربلوطی

مربی گروه زراعت و اصلاح نباتات، دانشگاه آزاد اسلامی واحد شهرکرد، چهارمحال و بختیاری غلام علی اکبری

استادیار گروه زراعت و اصلاح نباتات، پردیس ابوریحان، دانشگاه تهران، پاکدشت ایرج اله دادی

استادیار گروه زراعت و اصلاح نباتات، پردیس ابوریحان، دانشگاه تهران، پاکدشت

چکیده

to determine the effect of n-fertilizer on nitrogen harvest index (nhi), crop production and growth indices of corn (s.c.704 cultivar), an experiment was conducted with five nitrogen rates (100, 140, 180, 220 and 260 kg n/ha) in a randomly complete block design in four replicates. the effect of n-fertilizer rates on variation of grain yield, number of kernels, 1000-kernel weight, nitrogen harvest index (nhi), ear weight per unit area, biological yield and percentage of protein of kernels were significant (p< 0.05). additional n-fertilizer increased lai, laid, cgr and egr, while decreased nue. highest correlations were observed between ear weights per unit area, 1000-kernel weight, nitrogen harvest index and kernel harvest index with yield production.

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کلمات کلیدی
[ ' t o d e t e r m i n e t h e e f f e c t o f n ' , ' f e r t i l i z e r o n n i t r o g e n h a r v e s t i n d e x ( n h i ) ' , ' c r o p p r o d u c t i o n a n d g r o w t h i n d i c e s o f c o r n ( s . c . 7 0 4 c u l t i v a r ) ' , ' a n e x p e r i m e n t w a s c o n d u c t e d w i t h f i v e n i t r o g e n r a t e s ( 1 0 0 ' , 1 4 0 , 1 8 0 , ' 2 2 0 a n d 2 6 0 k g n / h a ) i n a r a n d o m l y c o m p l e t e b l o c k d e s i g n i n f o u r r e p l i c a t e s . t h e e f f e c t o f n ' , ' f e r t i l i z e r r a t e s o n v a r i a t i o n o f g r a i n y i e l d ' , ' n u m b e r o f k e r n e l s ' , 1 0 0 0 , ' k e r n e l w e i g h t ' , ' n i t r o g e n h a r v e s t i n d e x ( n h i ) ' , ' e a r w e i g h t p e r u n i t a r e a ' , ' b i o l o g i c a l y i e l d a n d p e r c e n t a g e o f p r o t e i n o f k e r n e l s w e r e s i g n i f i c a n t ( p < 0 . 0 5 ) . a d d i t i o n a l n ' , ' f e r t i l i z e r i n c r e a s e d l a i ' , ' l a i d ' , ' c g r a n d e g r ' , ' w h i l e d e c r e a s e d n u e . h i g h e s t c o r r e l a t i o n s w e r e o b s e r v e d b e t w e e n e a r w e i g h t s p e r u n i t a r e a ' , 1 0 0 0 , ' k e r n e l w e i g h t ' , ' n i t r o g e n h a r v e s t i n d e x a n d k e r n e l h a r v e s t i n d e x w i t h y i e l d p r o d u c t i o n . ' ]

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