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Nitrogen is commonly the most limiting plant nutrient in arable farming in the tropics and the most expensive mineral fertilizer element. Biological N fixation, as a biological process of capturing atmospheric N, holds a great promise to small-holder farmers particularly in the Northern Guinea Savanna (NGS) of Nigeria, where the soil is characterized low fertile. There is also a high cost of chemical fertilizers and environmental impacts. Differences among legumes, for ability to grow on low or high P soil exist, the mechanisms involved are not fully understood and few are vaguely described....

Soil salinity builds up in many agricultural soils, especially in the irrigated arid and semi-arid regions through various soil processes. In severe cases, this leaves detrimental consequences to the overall soil system. Physicochemical analyses of Soil and water samples from the irrigated region of the Sokoto-Rima flood plains at Sokoto were conducted to evaluate their salinity status. The sandy-loam soils were labelled saline non-sodic, chiefly augmented by the saline non-sodic status of the irrigation water observed in the area. Proper irrigation/drainage management, planting salt-tolerant...