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Fertilizer Use Efficiency and Nitrate Leaching in a Tropical Sandy Soil

^a Dep. of Soil Science and Agricultural Engineering, Univ. of Zimbabwe, P.O. Box MP167, Mount Pleasant, Harare, Zimbabwe
^b Division of Water Quality Management, Dep. of Soil Sciences, Swedish Univ. of Agricultural Sciences, P.O. Box 7072, S-750 07 Uppsala, Sweden

View larger version (39K): [in a new window]   Fig. 1. Accumulated leachate in replicated lysimeters of selected treatments, and weekly rainfall and pan evaporation at the experimental site during the study period.

View larger version (31K): [in a new window]   Fig. 2. Average NO3 concentrations in leachate collected from replicate lysimeters applied with different amounts of manure and mineral N fertilizer. Bars represent standard errors.