Soil characteristics are important indicators of the potential for agricultural production. This study investigates the direct and residual effects of green and farmyard manures on soil dry bulk density, total porosity, soil moisture percentage, infiltration rate and wheat grain yield of a desert plain soil in Northern Sudan during three successive seasons 2007/08 (direct effect), 2008/09 (direct and residual effects) and 2009/10 (residual effect). Treatments consisted of green manure produced from green gram (Vigna radiate) with two seed rates (0 and 12 kg ha-1), and farmyard manure with two levels (0 and 10 ton ha-1) arranged in a split plot design with three replicates. The results revealed that all studied treatments significantly decreased soil bulk density and infiltration rate (P ≤ 0.01), and increased total soil porosity and soil moisture percentage (P≤0.001), as compared to the control in response to the application of the two types of manures. The results also showed that the direct and residual effects of manures caused significant increase in the wheat grain yield of the desert plain soils. It can be concluded that green and farmyard manures had continuing positively effects on the desert plain soil to produce higher grain yield of wheat. Green manure, therefore, may be used in vast desert plain soils areas as it may pose a solution to the problems of the infertility and unavailability of organic manure and farmyard manure may be useful in small areas in the Northern State of Sudan.
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