The extent of grain yield and plant growth enhancement by plant growth-promoting broad-spectrum Streptomyces sp. in chickpea

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Table 4 Response of microbial biomass carbon and dehydrogenase activity in the chickpea rhizosphere to the application of different strains of Streptomyces spp. in a Vertisol during 2012–13 and 2013–14 post-rainy seasons

	Year 2012–13		Year 2013–14
Isolate	Microbial biomass C (μg g ⁻¹ soil)	Dehydrogenase activity (μg TPF g ⁻¹ soil 24 h ⁻¹ )	Microbial biomass C (μg g ⁻¹ soil)	Dehydrogenase activity (μg TPF g ⁻¹ soil 24 h ⁻¹ )
CAI-17	1221^*	52.7	974^*	68.6^*
CAI-68	1295^*	56.8	1000^*	71.5^*
CAI-78	1424^*	63.6^*	908^*	67.8
KAI-26	893^*	53.0	842^*	68.8^*
KAI-27	1132^*	56.8	444	59.0
Control	752	51.9	550	55.7
Mean	1119	55.8	786	65.2
SEM (±)	6.7^***	1.74^**	47.1^**	2.41^*
CV%	1	4	9	5

SEM = Standard Error of Mean; CV = Coefficients of variation; * = significant at p < 0.05, ** = significant at p < 0.01, *** = significant at p < 0.001; According to Dunnett’s t-test, isolate mean values are compared with control at p < 0.05.