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Farmers have reported 50% higher yield of rice by using fertiliser

$\begin{array}{1 1}(A)\;\text{Azolla pinnata}\\(B)\;\text{Legume-Rhizobium symbiosis}\\(C)\;\text{Cyanobacteria}\\(D)\;\text{Mycorrhiza}\end{array} $

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Farmers have reported 50% higher yield of rice by using fertiliser azolla pinnata
Hence (A) is the correct answer.
answered Jul 16, 2014 by sreemathi.v
 
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