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The role and function of Cimanuk Watershed tend to declining, where total of critical areaÂ reach to a high of 131,384 ha from the total of 358,400 ha or about 36.6 %. In wet seasonÂ debit of Cimanuk River reach 1,004 m3/second and in dry season reavh 4m3/second.Therefore the Debit Ratio of Cimanuk River reach to a high of 251, it is indicate thatÂ Cimanuk Watershed become very critical condition and need appropriate managementÂ especially in the upper watershed. One altervative of the watershed managementÂ is application of Alley Cropping system. The biomass from prunning of hedgerowsÂ Flemengia congesta have significant effect to land fertility through improvement ofÂ nutrients availability. Furthermore, the successful application of Alley Cropping system will
lead to conserve land and water where it will support flood control, agricultural irrigation,fisheries development, electric generation, industrial development, etc.Keywords: agricultural, alley cropping, land conservation, watershed
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