Which of the following increase the fertility of soil(a) lactobacillus bacteria (b) rhizobium bacteria (c) spirogura algae (d)blue -green algae (a)a&b (b)b&c (c)a&d (d) b&d
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b and d
they can fix nitrogen from atmosphere and thereby increase the Nitrogen content in the soil which in turn increase the fertility of the soil...
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d (b & d)
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