Browsing by Author "Debabrata Nath"

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Documentation of five potassium- and phosphorus-solubilizing bacteria for their K and P-solubilization ability from various minerals
(Elsevier Ltd, 2017) Debabrata Nath; Bihari Ram Maurya; Vijay Singh Meena
The ability of a few soil bacteria to transform unavailable forms of phosphorus (P) and potassium (K) to an available form is an important feature in plant growth-promoting bacteria for increasing crop yields of high- P and K-demand crops. In this research, screening and characterization of thirty-five K-solubilizing bacterial (KSB) and P-solubilizing bacteria (PSB) isolate which were evaluated for their ability to solubilize K and P from the waste muscovite (WM), waste biotite (WB), tri-calcium phosphate (TCP) and rock phosphate (RP) by analyzing the soluble P and K content after 7, 14, 21 days after incubation (DAI) at 28±2 °C on MABs (Modified Aleksandrov Broths) and Pikovskaya's medium. The soluble P and K contents in all isolates were significantly (p<0.01) higher than the contents in nonbacteria treatment. K-release from WB varied significantly from 3.5 to 5.0 µg mL−1, 4.4–6.3 µg mL−1 and 5.3–7.2 µg mL−1 at 7, 14 and 21 DAI, respectively. Herein, isolate KSB-105 had caused significantly higher K-release as compared to rest of isolates. Overall K-release from WB was highest by PSB-56 with 7.2 µg mL−1. While, significant higher amount of P-release was observed at 21 DAI (13.7 µg mL−1) followed by at 14 DAI (12 µg mL−1) and lowest was recorded at 7 DAI (5.1 µg mL−1). PSB-56 showed it's significantly superiority in P-release from TCP at 21 DAI (13.7 µg mL−1) as compared rest of isolates. Overall, it can be concluded that the diversity of KSB and PSB as bioinoculants to release K and P provides a win-win situation under in vitro condition. Therefore, it is crucial to adopt efficient KSB and PSB isolates in interventions for the judicious use of chemical and biological resources for maximizing food production while reducing pollution and rejuvenating degraded land for sustainable agriculture. © 2017 Elsevier Ltd
Index for refining soil health assessment through multivariate approach under diverse agro-climatic zones in the Indo-Gangetic basin of Bihar
(Elsevier B.V., 2024) Debabrata Nath; Ranjan Laik; Anup Das; Biswajit Pramanick; Panneerselvam Peramaiyan; Santosh Kumar Singh; Vandana Kumari; Surendra Singh Jatav; Abdus Sattar
A fundamental necessity in advancing sustainable crop production lies in the establishment of a reliable technique for assessing soil health. Soil health assessment is a challenge considering multiple interactions among dynamic indicators within various management strategies and agroecological contexts. Hence a study was conducted to determine the soil health variables, quantify the soil health index (SHI), and validate them with the productivity of rice (Oryza sativa L.)-wheat (Triticum aestivum L.) system for the Indo Gangetic basin of Bihar, India, under four contrasting agro-climatic zones (ACZ-I, II, IIIA & IIIB). For this study, 100 soil samples (0–15 cm) from each ACZ with a total of 400 soil samples were obtained for analyzing 20 soil health variables (soil physical, chemical, and biological properties). To identify SHI and important soil health variables, principal component analysis (PCA) was employed. Apart from specific variables, soil pH, soil organic carbon (SOC), available Zn and available water capacity (AWC) were identified as common indicators for the four ACZs. Results revealed that under the rice-wheat cropping system, ACZ-IIIB soils had a higher SHI (0.19–0.70) than other ACZs. SHI of ACZ-IIIB was significantly influenced by SOC (19.32 %), available P (10.52 %), clay (10.43 %), pH (10.80 %), and soil respiration (9.8 %). The strong relationship between SHI and system productivity of the rice-wheat (R2 = 0.79) system indicates that the selected soil health variables are representative of good soil health. It is concluded that ACZ-specific SHIs are a promising strategy for evaluating and monitoring soil health to achieve the United Nations' Sustainable Development Goal of ‘zero hunger’ by 2030. © 2024 Elsevier B.V.
Mycorrhizae: A potential microorganism and its implication in agriculture
(Springer Singapore, 2018) Debabrata Nath; Vijay Singh Meena
Mycorrhiza is a symbiotic mutualistic relationship between special soil fungi and fine plant root system. Mycorrhizal fungi are a heterogeneous group of diverse fungal taxa, associated with the roots of over 90% of all plant species. They play a crucial role in plant nutrient uptake, water relations, ecosystem establishment, plant diversity and the productivity of plants. Scientific research involves multidisciplinary approaches to understand the adaptation of mycorrhizae to the rhizosphere, mechanism of root colonization, effect on plant physiology and growth, biofertilization, plant resistance and biocontrol of plant pathogens, reclamation of heavy metals and contribution in soil aggregation. Mycorrhizae are an essential belowground component in the establishment and sustainability of plant communities, but thorough knowledge is required to achieve maximum benefits from these microorganisms and their associations. © Springer Nature Singapore Pte Ltd. 2018. All rights reserved.