Assertion: cyanobacteria | /r/CapableOf | add about 20–30 kg fixed nitrogen
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Source sentences:
text: Tg of nitrogen is fixed by biological nitrogen fixers (Singh et al., 2016), and cyanobacteria add about 20–30 kg fixed nitrogen ha−1 along with organic matter to the paddy fields (Subramanian and Sundaram, 1986; Issa et al., 2014).