Soybean an alternative cash crop is a comprehensive account of the fundamentals of agronomy of the crop in other words a tool for soybean breeding in the Sudan. It incorporates information about the constraints and potentiality of growing soybean as an alternative cash crop for Sudan. It put forward a concise account about the decline in the country's economy reflected in low productivity encountered farmers. The book emphasizes on the suitable agro climate of the Sudan to develop an adaptable and high yielding genotypes. This potentiality is proven by the undertaken research in the Sudan. The book will be a useful lecture material for undergraduate student of agriculture, graduate students working on legume crops or oilseed crop. It could be used by agronomist, extension officers, farmers and soybean breeders.