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Recycling of isabgol(Plantago ovata Forsk.)straw biomass and mineral powder with bio-inoculants as an effective soil amendment for isabgol cultivation

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Pedosphere 2022年第5期32卷 686-697页

作者： biraj bandhu basak Ajoy SAHA Indian Council of Agricultural Research-Directorate of Medicinal and Aromatic Plants Research Anand 387310(India) Indian Council of Agricultural Research-Central Inland Fisheries Research Institute Bangalore Research CentreBengaluru 560089(India)

Efficient utilization of isabgol(Plantgo ovata Forsk.)straw biomass through preparation of bio-active organic fertilizer in a natural composting process has not been studied.In this study,phosphate rock and silicate mineral(mica)powder were used as natural sources of phosphorus(P)and potassium(K),respectively.Cow dung slurry as a natural decomposer was mixed with the straw biomass at a 10:1(weight/weight)ratio along with mineral powder.Then,nutrient-mobilizing bio-inoculants were used in the composting process after attaining thermal stabilization.The agronomic effectiveness of the resulting bio-active compost(BAC)as a bio-organic fertilizer was compared with that of conventional organics(farmyard manure and vermicompost)and chemical fertilizer(CF)by growing isabgol under field conditions.Composting with the natural sources of P and K along with the bio-inoculants increased the total nitrogen(13.6 g kg^(-1)),P(38.7 g kg^(-1)),and K(31.2 g kg^(-1))contents in the final product(i.e.,BAC)compared with composting without the mineral powder and bio-inoculants.Application of BAC remarkably improved the seed yield(2.5%)and husk quality of isabgol in comparison with conventional organics and CF.Compared with CF,BAC significantly boosted the economic yield of isabgol by improving the husk recovery(2.5%)and mucilage yield(4.12%).Furthermore,BAC significantly improved the soil quality by increasing organic carbon(C),available nutrients,and microbial biomass C contents,as well as enzyme activity.The positive correlation between soil and plant parameters also highlighted the benefits of BAC for isabgol production through soil quality improvement.Therefore,it can be considered as a zero-waste technology,whereby a large quantity of straw biomass generated from isabgol cultivation,which contains essential nutrients,can be recycled back to the soil.Furthermore,BAC can be effectively used as a bio-active organic fertilizer,particularly in systems where chemical inputs are restricted,such as organic agriculture.

关键词： agronomic effectiveness bio-active compost crop residue enriched compost low-grade minerals organic fertilizer soil properties

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