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    Physico‑chemical, microbial and phytotoxicity evaluation of composts from sorghum, finger millet and soybean straws

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    U18ArtJagadabhiPhysicochemicalNothomNodev.pdf (1.587Mb)
    Date
    2018
    Author
    Jagadabhi, P.S.
    Wani, S.P.
    Kaushal, M.
    Patil, M.
    Vemula, A.K.
    Rathore, A.
    Type
    Journal Article
    Target Audience
    Scientists
    Metadata
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    Abstract/Description
    Purpose Composting is an environmentally sustainable alternative for bioconversion of agricultural residues into a nutrient-rich product that can enhance soil fertility/microbial diversity and thereby improve agricultural productivity. The goal of the current study was to evaluate the decomposition pattern of the agro-residues and assess the maturity and phytotoxicity of the composts obtained using physico-chemical, microbial and statistical analyses. The study also attempted to determine a threshold germination index (GI) to serve as a maturity index for the composts by conducting seed germination assays with tomato, chickpea and soybean seeds. Methods Three agricultural residues/straws of Eleusine coracana (finger millet), Sorghum bicolor (sorghum) and Glycine max (soybean) were subjected to aerobic composting for a period of 60 days to study the impact of saw dust on the decomposition pattern and the ultimate compost quality/characteristics. Results The results showed efficient decomposition pattern of the agricultural residues characterized by high temperature profiles (up to 70 °C), high microbial activity, a sharp decrease in C/N ratio of the composting materials, i.e., from an initial 41–61 to final 10–17. Conclusions Statistical evaluation of seed germination assays showed that only the compost obtained from sorghum straw + saw dust was mature and free from any phytotoxicity as all the tested seeds showed higher and statistically significant GIs. It was difficult to attribute a single threshold GI value to indicate maturity of compost and could not further be applied to different types of composts as different seeds responded differently to the same compost.
    https://dx.doi.org/10.1007/s40093-018-0240-8
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/5200
    Non-IITA Authors ORCID
    Abhishek Rathorehttps://orcid.org/0000-0001-6887-4095
    Digital Object Identifier (DOI)
    https://dx.doi.org/10.1007/s40093-018-0240-8
    IITA Subjects
    Grain Legumes; Soybean
    Agrovoc Terms
    Straw; Composts; Phytotoxicity; Maturity; Seed Germination
    Journals
    International Journal of Recycling of Organic Waste in Agriculture
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    • Journal and Journal Articles4835
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