@article{icrisat5110,
           title = {Crop yield and the fate of nitrogen and phosphorus following application of plant material and feces to soil},
       publisher = {Springer},
            year = {1999},
          author = {J M Powell and F N Ikpe and Z C Somda},
           pages = {215--226},
          volume = {54},
            note = {We would like to thank Salvador Fernandez-Rivera,
Pierre Hiernaux and Michael Russelle for their constructive
comments on the first draft of this pape},
         journal = {Nutrient Cycling in Agroecosystems},
          number = {3},
             url = {http://oar.icrisat.org/5110/},
        abstract = {Organic materials are the most important sources of nutrients for agricultural production in farming systems of
semi-arid West Africa. However, reliance on locally available organic nutrient sources for both crop and livestock
production is rapidly becoming unsustainable. A series of feeding and agronomic trials have been conducted to
address the role of livestock in sustainable nutrient cycling. This paper reports results of a greenhouse study that
evaluated the effects of applying crop residue and browse leaves, or feces derived from these feeds, at equal
organic-N application rates (150 kg ha}
}