AN APPROACH FOR USE OF CLEANING CROPS AS READILY

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To evaluate the potentials of growth and nitrogen (N) uptake of genus Crotalaria used as a cleaning crop, interspecific differences in dry matter production, root nodule formation, and N uptake among several species were investigated in field and pot experiments at Osaka, Japan. C.spectabilis, C.breviflora, C.pallida, and C.incana exhibited vigorous vegetative growth, expanding leaf area and branching. All the species had high dry weights and a great N content. Incorporation of each species provided a large amount of N necessary for the succeeding wheat crops. Several indicators for rapid decomposition of the plants, such as total C, N and lignin contents, were investigated, and the possible increases in N supply and growth inhibition by incorporation to wheat crops were discussed. N-depositing capacity of C.breviflora, C.spectabilis and Sesbania rostrata was also evaluated. The proportion of N derived from rhizodeposited materials of green manures to total N in succeeding crop was relatively high, suggesting that excretion of N from active root nodules should be considered as regulator in N starvation in soil incorporated green manures.