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  1. Article ; Online: Impact of conservation agriculture on humic acid quality and clay humus complexation under maize (Zea mays)-wheat (Triticum aestivum) and pigeon pea (Cajanus cajan)-wheat cropping systems

    ABHISHEK DAS / NAYAN AHMED / T J PURAKAYASTHA / SUNANDA BISWAS / PRASENJIT RAY / BINDER SINGH / T K DAS / RAJESH KUMAR / ACHAL LAMA

    The Indian Journal of Agricultural Sciences, Vol 93, Iss

    2023  Volume 9

    Abstract: An attempt was made to study the humic acid (HA) quality and clay humus complex in order to generate valuable information regarding soil carbon (C) and recalcitrant carbon variations under conservation agriculture (CA) practices. It is worthwhile to ... ...

    Abstract An attempt was made to study the humic acid (HA) quality and clay humus complex in order to generate valuable information regarding soil carbon (C) and recalcitrant carbon variations under conservation agriculture (CA) practices. It is worthwhile to mention that CA has got wider acceptance among researchers and farmers nowadays. A field experiment was conducted in an Inceptisol with three treatments, namely conventional tillage (CT), zero tillage (ZT) without residue and zero tillage with residue (ZT+R) in a maize (Zea mays L.)-wheat (Triticum aestivum L.) (M-W) and pigeon pea (Cajanus cajan L.)-wheat (P-W) cropping system at ICAR-Indian Agricultural Research Institute, New Delhi, with a view to characterize the HA by E4/E6 ratio and total acidity, and to specify the functional groups of clay humus complex. In ZT+R based treatments, lower E4/E6 ratio and total acidity of extracted HA showed higher degree of humification and stability of humic acid carbon (HA-C). The FTIR spectroscopy of the clay-humus complex (as extracted from soil) displayed the presence of a large number of functional groups in ZT+R treatment followed by ZT and CT. It was also observed that the yield of crops was also significantly higher in ZT+R than CT in both the cropping systems except in wheat crops in the M-W system. Therefore, it can be concluded that ZT+R has the potential to enrich the organic carbon (C) quality in soil and increase the aromaticity of HA, leading to carbon stabilization in soils.
    Keywords Aromaticity ; Conservation agriculture ; Clay humus ; Humic acid ; Total acidity ; Agriculture ; S
    Subject code 571
    Language English
    Publishing date 2023-09-01T00:00:00Z
    Publisher Indian Council of Agricultural Research
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article: Soil Carbon Stability Assessment by Humus Desorption Using Simple First Order Exponential Equation in a Toposequence of Western Himalayan Region

    Lungmuana / Nayan Ahmed / Tapan Gorai / S. C. Datta

    National Academy science letters. 2018 Feb., v. 41, no. 1

    2018  

    Abstract: A chemical method based on batch desorption of adsorbed humus on clay-humus complex by sodium hydroxide-sodium pyrophosphate solution was used to assess the stability of humus C through the desorption rate constant using simple first order exponential ... ...

    Abstract A chemical method based on batch desorption of adsorbed humus on clay-humus complex by sodium hydroxide-sodium pyrophosphate solution was used to assess the stability of humus C through the desorption rate constant using simple first order exponential equation in a toposequence of Western Himalaya region of India. The rate constant values were significantly (p < 0.0001) higher in hill top (0.305 day⁻¹) and narrow valley (0.184 day⁻¹) than side slope (0.125 day⁻¹) and broad valley (0.11 day⁻¹) suggesting higher stability of soil C in side slope and broad valley. This variation implies that clay particles are active in binding humus C and soil texture plays an important role in stabilizing soil C.
    Keywords carbon ; clay ; desorption ; equations ; hills ; humus ; sodium ; soil texture ; Himalayan region ; India
    Language English
    Dates of publication 2018-02
    Size p. 7-10.
    Publishing place Springer India
    Document type Article
    ZDB-ID 2677544-X
    ISSN 2250-1754 ; 0250-541X
    ISSN (online) 2250-1754
    ISSN 0250-541X
    DOI 10.1007/s40009-018-0609-2
    Database NAL-Catalogue (AGRICOLA)

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  3. Article ; Online: Rapid prediction of soil available sulphur using visible near-infrared reflectance spectroscopy

    BHABANI PRASAD MONDAL / RABI NARAYAN SAHOO / NAYAN AHMED / RAJIV KUMAR SINGH / BAPPA DAS / NILIMESH MRIDHA / SHALINI GAKHAR

    The Indian Journal of Agricultural Sciences, Vol 91, Iss

    2021  Volume 9

    Abstract: Rapid and accurate prediction of soil available S, an important secondary nutrient, is crucial for its site-specific management in a cultivated region. Although traditional chemical analysis of any nutrient is an accurate method, but often costly, time- ... ...

    Abstract Rapid and accurate prediction of soil available S, an important secondary nutrient, is crucial for its site-specific management in a cultivated region. Although traditional chemical analysis of any nutrient is an accurate method, but often costly, time-consuming and destructive in nature. Recently visible near-infrared (VIS-NIR) reflectance spectroscopic technique has gained its popularity for rapid, non-destructive and cost-effective assessment of soil nutrients. Hence, a study was carried out in an intensively cultivated region of Katol block of Nagpur, Maharashtra, during 2018-20 for rapid prediction of soil available S using spectroscopic technique. Both spectroscopic and chemical analyses were carried out using 132 georeferenced surface soil samples (0-15 cm depth). The descriptive statistical analysis showed that the available S content varied from 1.09 to 47.88 mg/kg. Multivariate models namely partial least square regression (PLSR) and random forest (RF) were applied to develop spectral models for S prediction from spectral dataset. Several statistical diagnostics like coefficient of determination (R2), root mean square error (RMSE), ratio of performance deviation (RPD) and ratio of performance to interquartile distance (RPIQ) were used to evaluate the performances of two models. The best prediction of S was achieved from nonlinear RF model (R2 = 0.71, RMSE = 8.86, RPD =1.18, RPIQ = 1.69) as compared to linear PLSR model (R2 = 0.53, RMSE = 9.04, RPD = 1.16, RPIQ = 1.66) datasets. Therefore, the result suggested applying non-linear multivariate model (RF) for obtaining best predictability for S from spectroscopic technique.
    Keywords Available sulphur ; Multivariate models ; PLSR ; Reflectance spectroscopy ; RF ; Agriculture ; S
    Language English
    Publishing date 2021-09-01T00:00:00Z
    Publisher Indian Council of Agricultural Research
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  4. Article ; Online: Protective measures are associated with the reduction of transmission of COVID-19 in Bangladesh

    Nadim Sharif / Khalid J Alzahrani / Shamsun Nahar Ahmed / Rubayet Rayhan Opu / Nayan Ahmed / Aeken Talukder / Raju Nunia / Mysha Samiha Chowdhury / Israt Jahan Nodi / Tama Saha / Ming Zhang / Shuvra Kanti Dey

    PLoS ONE, Vol 16, Iss 11, p e

    A nationwide cross-sectional study.

    2021  Volume 0260287

    Abstract: Coronavirus disease 2019 (COVID-19) pandemic has become a major public health issue globally. Preventive health measures against COVID-19 can reduce the health burden significantly by containing the transmission. A few research have been undertaken on ... ...

    Abstract Coronavirus disease 2019 (COVID-19) pandemic has become a major public health issue globally. Preventive health measures against COVID-19 can reduce the health burden significantly by containing the transmission. A few research have been undertaken on the effectiveness of preventive strategies such as mask use, hand washing, and keeping social distance in preventing COVID-19 transmission. The main aim of this study was to determine the association of the preventive measures with the reduction of transmission of COVID-19 among people. Data was collected during January 06, 2021 to May 10, 2021 from 1690 participants in Bangladesh. A validated questionnaire was used to collect both the online and offline data. Chi-square test and logistic regression analyses were performed to determine the association among the variables. The prevalence of COVID-19 was 11.5% (195 of 1690) among the population. Age, gender, occupation and monthly income of the participants were significantly associated with the likelihood of following the preventive measures. The risk of infection and death reduced significantly among the participants following preventive measures (p = .001). The odds of incidence was lower among the participants using masks properly (OR: 0.02, 95% CI: 0.01-0.43), maintaining social distances (OR: 0.04, 95% CI: 0.01-0.33), avoiding crowded places (OR: 0.07, 95% CI: 0.02-0.19) and hand shaking (OR: 0.17, 95% CI: 0.09-0.41). This study suggests that preventive health measures are significantly associated with the reduction of the risk of infection of COVID-19. Findings from this study will help the policymakers to take appropriate steps to curb the health burden of COVID-19.
    Keywords Medicine ; R ; Science ; Q
    Language English
    Publishing date 2021-01-01T00:00:00Z
    Publisher Public Library of Science (PLoS)
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  5. Article ; Online: Long-term effect of fertilization and manuring on soil aggregate carbon mineralization

    RAJENDRA KUMAR YADAV / T J PURAKAYASTHA / NAYAN AHMED / RUMA DAS / BIDISHA CHAKRABARTY / SUNANDA BISWAS / V K SHARMA / POOJA SINGH / DAIZEE TALUKDAR / K K MOURYA / S S WALIA / ROHITASAV SINGH / V K SHUKLA / M S YADAVA / N RAVISANKAR / BASU DEVI YADAV

    The Indian Journal of Agricultural Sciences, Vol 91, Iss

    2021  Volume 2

    Abstract: The 32 years impact of manuring and fertilization on carbon mineralization in macro- and micro-aggregates in major soil groups of India was studied. Mollisol, Inceptisol, Vertisol, and Alfisol samples were collected (0-15 cm soil depth) from the ... ...

    Abstract The 32 years impact of manuring and fertilization on carbon mineralization in macro- and micro-aggregates in major soil groups of India was studied. Mollisol, Inceptisol, Vertisol, and Alfisol samples were collected (0-15 cm soil depth) from the treatments comprising of control, 100% NPK, 50%NPK+50% N-FYM, 50%NPK+50%N-WR (Wheat residue), 50% NPK + 50% N-GM (Green manure) in the year 2015. The results showed that the mineralizable C pool was significantly higher in treatments applied with 50%NPK+50%N-GM in Mollisol and Vertisol. In Alfisol and Inceptisol, 50% NPK+50% N-FYM and 50% NPK+50% N-GM were significantly higher in both macroaggregates and micro-aggregates protected carbon. Supplementation of fertilizer N either through FYM or various green manuring crops like Sesbania (Sesbania aculeata L. in Inceptisol), greengram (Vigna radiata L. in Mollisol), sunhemp (Crotalaria juncea L. in Vertisol) and karanj (Pongamia pinnata L. in Alfisol) significantly improved mineralizable carbon pool signifying their potential contributions to nutrient cycling and thereby nutrient availability to various crops in the cropping systems in the above soils.
    Keywords Carbon mineralization ; FYM ; Macro-aggregates ; Micro-aggregates ; Soil organic matter ; Soil organic carbon ; Agriculture ; S
    Subject code 550
    Language English
    Publishing date 2021-04-01T00:00:00Z
    Publisher Indian Council of Agricultural Research
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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