The influence of source and timing of nitrogen fertilizers on yield and nitrogen use efficiency of four sweet potato cultivars

Author： Ankumah R.O.   Khan V.   Mwamba K.   Kpomblekou-A K.  

Publisher： Elsevier

ISSN： 0167-8809

Source： Agriculture, Ecosystems & Environment, Vol.100, Iss.2, 2003-12, pp. : 201-207

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