Abstract
AbstractSixty‐seven strains of seven species of Azolla were screened for tolerance to ammonium ion on the basis of their growth on the medium with or without 20 mmol/L ammonium. Azolla nilotica was the most sensitive species followed by Azolla rubra. Azolla pinnata var. pinnata was the most tolerant species. Twelve tolerant strains in Azolla mexicana, Azolla caroliniana, Azolla microphylla and A. pinnata var. pinnata were selected. No tolerant strain was found in Azolla filiculoides containing native strains in Japan.
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