Study on the root property and waterlogging tolerance of biomass crops

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Tolerance against excessive soil water content and waterlogging was examined for biomass crops, Erinathus spp., Napier grass, kenaf, and Jatropha curcas. All the four plants showed higher tolerance than maize and soybean; especially, Napier grass and kenaf, which formed superficial roots in a short period after the onset of waterlogging, resulted in rather high shoot biomass. Such relation between superficial root formation under waterlogging and maintenance of shoot biomass was found in the experiments on the varietal difference among Napier grass varieties. In case of Erianthus, excessive soil anaerobic condition declined next-year shoot growth. The excessive soil anaerobic condition may have disturbed the starch deposition in root stele of Erianthus during winter as the source of spring growth.