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Evaluation of the availability of Azolla-N and urea-N to rice using 15N
Nitrogen Fixation with Non-Legumes
Springer Netherlands, January 1986
K. S. Kumarasinghe, F. Zapata, G. Kovacs, D. L. Eskew, S. K. A. Danso
F. A. Skinner, P. Uomala