Application of ameliorant and microbials fertilizer as bioagent for enhancing the health of rhizomicrobiome and yield of soybean on marginal soils ecosystem

Abstract

Abstract The sustainability of agricultural production depends on the health of soils ecosystem and soil properties. Rhizomicrobiome act as external digestive organs of the plant plays a magnificent role for enhancing the nutrient availability, soil health and plant growth on marginal soils. The intensive use of agrochemical such as inorganic fertilizers has accelerated the soil health degradation and inefficiency of fertilizers use. Bioameliorant or bioagent containing activated carbon, organic extract, humic substances and beneficial rhizobacteria was developed and formulated as soil conditioner and microbial fertilizer for improving the soil properties and increasing the microbial population in rhizosphere microbiome (rhizomicrobiome) and as well as to increase the yield of soybean. The experiment was set up as randomized block design, consisted of 7 treatments (0, 4, 8, 12, 16 kg ha−1 of bioagent, 1 ton ha−1 dolomite and 1 ton ha−1 manure) and provided with 4 replications. The chemical properties (organic carbon, pH and CEC), beneficially bacterial population in rhizomicrobiome (Azospirillum sp., Pseudomonas sp. and Bacillus sp.) and soybean grain yield were significantly increased by the low dosage application of organic bioagent. Application of 8-12 kg ha−1 of bioagent had increased the grain yield of soybean significantly (about 47.5-51.1% higher than control). The obtained yield was not different significantly either with application 1 ton ha−1 dolomite or 1 ton ha−1 organic manure. Consequently, application of 8-12 kg ha−1 of bioagent can be recommended to substitute the use of conventional ameliorant and to enhance the bacterial biodiversity in rhizomicrobiome for increasing the soil health and soybean yield.