Browsing by Author "Abdus Sattar"

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An Exact Chameleon Cosmological Model Unifying Phantom Inflation with Late-Time Acceleration
(2011) Abdus Sattar; S.R. Prajapati
An exact Chameleon cosmological model describing the evolution of a non-singular bouncing cosmology with the phantom divide line crossing is obtained by constructing two independent functions of the scalar field. © 2011 Springer Science+Business Media, LLC.
Climate-Resilient Rice Establishment Practices: Findings and Lessons from Two Villages in Bihar, India
(Multidisciplinary Digital Publishing Institute (MDPI), 2023) Subhashisa Praharaj; Ratnesh Kumar Jha; Anil Kumar Singh; Shishir Kumar Gangwar; Rajendra Pratap Singh; Madhu Sudan Kundu; Abdus Sattar; Chelpuri Ramulu; Abhinav Kumar Singh; Surendra Singh Jatav; Abhik Patra
A growing population, changing climate, scarcity of resources, and the urgent need to achieve sustainable development goals makes it imperative to reimagine agriculture in a way that makes it economically profitable, climate-resilient, resource-efficient. Traditional rice production technology involving puddling and transplanting has often been criticized for its inefficient resource utilization, high cost of production, and emission of greenhouse gases such as methane. Direct-seeded rice (DSR), promoted for its climate-resilient nature, is often utilized by farmers in three different ways: broadcasting, line sowing, and zero tillage. However, these establishment methods have certain advantages and limitations, as perceived by farmers. The present study attempts to closely study the crop performance of rice under the abovementioned crop establishment methods. The study was conducted in farmers’ fields in a way where both the farmers’ freedom and research conditions were equally taken care of. The study aims to analyze crop performance while emphasizing farmers’ field-based knowledge to ensure a lab-land-lab loop for understanding the scope of refinement in agronomic as well extension strategies. The results of this study reveal the superiority of zero tillage over broadcasting and line sowing in terms of crop performance and economic performance in the northwest alluvial plain zone of Bihar. The study has also identified the constraints associated with adoption of line sowing and zero tillage. © 2023 by the authors.
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.