Greener Journal of Agricultural Sciences

Greener Journal of  Agricultural Sciences Vol. 2 (5), pp. 188-194, September 2012

 ISSN: 2276-7770 

Research Paper

Manuscript Number:08181245

 

Effects of nitrogen application on dry land wheat roots and shoot

 

J. Abdollahi Gharakand^1*, K. Hashemi- majd², S.B. Mosavi³ , 

V. Feiziasl⁴, J. Jafarzadeh ⁴, E. karimi³

 

¹MS Student in University of Mohagheghi –e- Ardabil, Soil Science Department, Ardabil, Iran.  

²Soil Science Department. Faculty of Agriculture, University of Mohagheghi –e- Ardabili,

³Soil Science Department, Faculty of Agriculture, University of Maragheh, Maragheh, Iran.

⁴Dryland Agriculture Research Institute (DARI), Maragheh, Iran.

 

*Corresponding Author’s Email: abdollahij@yahoo.com

Abstract:

Nitrogen application could have affected the shoot and roots of plants. This experiment was conducted in a split plot design with ten nitrogen levels (0, 15, 20, 30, 40, 45, 60, 80, 90 and 120 kg N.ha-1 as urea) in main plot and 5 dry land wheat genotypes (Azar2, Sardari, Sardari39, Sardari101 and Rasad) in sub-plot with 4 replications. Results showed that, in tillering stage (GS21) nitrogen fall application increased plant wet weight, root wet weight significantly at 1%, and increased number of nodal roots, plant dry weight and root volume significantly at 5%. Nitrogen application increased root wet weight 157%, root volume 114%, number of nodal roots 60% and grain yield 47%. Results showed that root wet weight, root volume and number of nodal roots was significantly positive maximum direct effects on grain yield respectively. Coleoptile, root wet weight and seminal roots length were affected indirectly above the mentioned characteristic effects on grain yield. Direct effects of coleoptile length, seminal roots length and number of seminal roots were negative on grain yield significantly. Mean dry-land wheat nitrogen requirement for obtaining of 95% maximum grain yield and maximum root volume, calculated 42 kgN.ha-1 from urea in drought year with 137 mm annual rainfall.
 
Key words: Nitrogen, root, shoot, dry land, wheat.

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