Long-term effect of manure and mineral fertilizer application on the distribution of organic nitrogen fractions in soil under a rice–wheat cropping system

2011 ◽  
Vol 57 (7) ◽  
pp. 705-714 ◽  
Author(s):  
Karamjit Singh Sekhon ◽  
Jai Pal Singh ◽  
Dalel Singh Mehla
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