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Bihar Agricultural University, Sabour

Bihar Agricultural University, Sabour established on 5th August, 2010 is a basic and strategic institution supporting more than 500 researchers and educationist towards imparting education at graduate and post graduate level, conducting basic, strategic, applied and adaptive research activities, ensuring effective transfer of technologies and capacity building of farmers and extension personnel. The university has 6 colleges (5 Agriculture and 1 Horticulture) and 12 research stations spread in 3 agro-ecological zones of Bihar. The University also has 21 KVKS established in 20 of the 25 districts falling under the jurisdiction of the University. The degree programmes of the university and its colleges have been accredited by ICAR in 2015-16. The university is also an ISO 9000:2008 certified organisation with International standard operating protocols for maintaining highest standards in teaching, research, extension and training.VisionThe Bihar Agricultural University was established with the objective of improving quality of life of people of state especially famers constituting more than two third of the population. Having set ultimate goal of benefitting society at large, the university intends to achieve it by imparting word-class need based agricultural education, research, extension and public service.

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20171
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Subject: Soil Science and Agriculture Chemistry × Author: Adhikary, Samrat ×
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    ThesisItemOpen Access
    Evaluation of Nano Zn carriers in term of release kinetics, Zn fractions and soil enzymatic activities under rice rhizosphere
    (Department of Soil Science and Agricultural Chemistry, BAU, Sabour, 2017-07) Adhikary, Samrat; Mandal, Nintu
    Zinc (Zn) deficiency is a widespread phenomenon globally. Indian soils are dominantly deficient in DTPA extractable Zn. Coarse texture sandy soil, low in organic matter, calcareousness, high yielding cereal-cereal cropping system with omission of Zn fertilizer accentuates Zn deficiency. Conventional Zn fertilizers (ZnSO4. 7 H2O) reported to have very low use efficiency of applied Zn (1-5%). Hence, technological interventions in increasing Zn efficiency is if utmost importance. Keeping in this background a research work was undertaken entitled “Evaluation of Nano Zn carriers in term of release kinetics, Zn fractions and soil enzymatic activities under rice rhizosphere” with the objectives of (i) To study release kinetics of Zn and Fe from various Zn carriers in laboratory incubation experiment under Inceptisol and Alfisol and (ii) To evaluate ZNCPC (Zincated nanoclay polymer composites), Nano ZnO in comparison with ZnSO4. 7H2O on various fractions of soil Zn, Fe, soil enzymatic activities under rice rhizosphere in field experiment. Nano Zn carriers were characterized using differenttechniques viz. Transmission electron microscopy (TEM), X-ray diffraction (XRD) and Fourier transform infrared spectra (FTIR). TEM images confirmed that clay and nano ZnO were in nano dimension (<100 nm at least one dimension). X-RD confirmed that nano ZnO was of wurtzite mineralogy and exfoliated nature of clay by disappearance of typical montmorillonitic peak at 14.8 Å. Functional group characteristics were confirmed by FTIR (Zn-O stretching vibration at 417 cm-1 and interaction of clay and monomers by absence of –OH stretching at 3400 cm-1). ZNCPC, nano ZnO, Zn-citrate were compared with ZnSO4. 7 H2O under laboratory incubation experiment in two different Zn deficient soil vizInceptisol and Alfisol.ZNCPC was found to be the most efficient Zn carrier as compared to ZnSO4. 7 H2O as well as other Zn carrier. Maximum DTPA-Zn (2.99 mg kg-1) was recorded at 45 days after incubation in Inceptisol and at 60 days after incubation (2.36 mg kg -1 ) in Alfisol. Zn citrate was found to be efficient Zn carrier as compared to ZnSO4. 7 H2O followed by ZNCPC. DTPA -Zn was found to be maximum (3.16 mg kg -1) at 15 days after incubation in Inceptisol and at 60 days after incubation in Alfisol(1.97 mg kg -1). Nano Zn carriers (ZNCPC at three doses 100%, 75% and 50%) and nano ZnO were further evaluated in comparison with ZnSO4. 7 H2O a field experiment under rice (Rajendra Mahsuri)rhizosphere. DTPA Zn was significantly increased under 100% ZNCPC (1.78 mg kg-1). Sequential Zn fractionation revealed that under ZNCPC treatments there was significant increase of water soluble, exchangeable and organically bound Zn, whereas there was significant increase of residual and specifically adsorbed Zn under ZnSO4. 7 H2O.ZNCPC significantly increased MBC (Microbial biomass carbon), AP (Acid phosphatase) and ALP (Alkaline phosphatase) activity in rhizosphere.Grain Zn content was maximum under 100% ZNCPC treatment (43.91 mg kg-1) and for nano ZnO (36.89 mg kg-1).Maximum AZR (Apparent Zn recovery) was found in case of 100% ZNCPC (26.05%) followed by 75% ZNCPC (20.72%) and nano ZnO (18.23%). ZNCPC was found to be promising Zn formulation in increasing Zn use efficiency and stimulating soil microbial activity. Nano ZnO at foliar spray proved to be effective in increasing grain Zn concentration. However, ZNCPC and nano ZnO need to be evaluated in long-term experiment in various soil types and cropping system for evaluatingbenefit: costratio and wide scale farmers’ adaptability.