The book "Bypass Flow Nitrogen Losses In Vertisols In Tropical Environments" by Charles Onyango provides a comprehensive analysis of nitrogen losses in tropical vertisols caused by bypass flow. It examines how various soil characteristics, forms of nitrogen, and rainfall patterns affect the amount of nitrogen lost through bypass flow. The research shows that pre-wetting the soil before fertilization has significant effects on nitrogen losses. In particular, it addresses the differentiation between ammonium and nitrate leaching, with results indicating that nitrate leaching occurs to a much greater extent than ammonium losses. This academic book is aimed at scientists, agricultural economists, and practitioners dealing with fertilizer application and its associated ecological impacts in tropical regions.