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Effects of nitrogen fertilizer application methods on growth and acetylene reduction activity ofAzolla pinnata and yield of rice

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Abstract

The influence of different methods of N fertilizer application-sub-surface placement (SS) and broadcast application (BC) as a single basal dose of 40 kg N ha−1 of urea (U) and ammonium sulphate (AS)-on fresh weight (FW) and acetylene reduction activity (ARA) ofAzolla pinnata (Bangkok) and yield of rice was studied for consecutive three seasons. The FW, ARA and N yield ofAzolla were significantly superior with SS placement than with BC application. Of the two N sources, AS was superior to U in recording higher FW, ARA and N yield of Azolla irrespective of methods of N application. Crop yield and crop N uptake were higher with SS application alone and in combination with Azolla as compared to that of surface application of N fertilizers. The combined use of AS and Azolla recorded significantly higher crop yield and crop N uptake than that of U combined with Azolla, irrespective of methods of application.

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Authors and Affiliations

  1. Laboratory of Blue-green Algae and Azolla, Central Rice Research Institute, 753006, Cuttack, Orissa, India

    A. B. Manna & P. K. Singh

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  1. A. B. Manna
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  2. P. K. Singh
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Manna, A.B., Singh, P.K. Effects of nitrogen fertilizer application methods on growth and acetylene reduction activity ofAzolla pinnata and yield of rice. Fertilizer Research 28, 25–30 (1991). https://doi.org/10.1007/BF01048852

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  • DOI: https://doi.org/10.1007/BF01048852

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