Abstract
Azolla pinnata (India) andAzolla caroliniana (USA), were grown with rice variety IR-36 using no urea as well as with urea at 10 and 20 kg N ha−1. Azolla received only the urea applied at transplanting which amounted to 50% of that provided to the rice crop. The results indicated that increasing levels of urea nitrogen decreased the fresh biomass, acetylene reduction activity (ARA) and N yield of bothAzolla species.A. caroliniana out performedA. pinnata, attaining greater biomass, higher ARA and more total N under all nitrogen regimes. Grain yield and crop N uptake also were greater withA. caroliniana than withA. pinnata.
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Manna, A.B., Singh, P.K. Growth and nitrogen fixation ofAzolla pinnata andAzolla caroliniana as affected by urea fertilizer and their influence on rice yield. Plant Soil 122, 207–212 (1990). https://doi.org/10.1007/BF02851977
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DOI: https://doi.org/10.1007/BF02851977