Indu Chopra - Academia.edu (original) (raw)

Papers by Indu Chopra

Biomass & Bioenergy, Apr 1, 2011

Effect of auxins (IAA, IBA, NAA) and vitamin-B 1 (thiamine) on rooting response of branch cutting... more Effect of auxins (IAA, IBA, NAA) and vitamin-B 1 (thiamine) on rooting response of branch cuttings and air-layers of Jatropha curcas in relation to spring and monsoon seasons was investigated. Spring season was found best for clonal multiplication of genetically superior material in jatropha. Cuttings treated with 600 and 800 mg L À1 thiamine showed 100% sprouting in both seasons. The average sprout growth was also found maximum in thiamine treated cuttings. Auxins enhanced rooting of cuttings in spring season but showed very poor response or even failed to root during monsoon. Among different growth regulators; thiamine triggered highest rooting during monsoon and was comparable during spring season. Average percent rooting was also recorded maximum in air-layers treated with thiamine (75, 150, 300, 600 mg L À1) in comparison to auxins in both the seasons. However, number of roots per layer increased with increasing concentration of NAA and IBA in spring but decreased in monsoon season. Cleft grafting was found more promising in terms of success in rainy season however; the growth of the grafted plants was quite slow as compared to spring season. This technique can be practically applied on commercial scale in the areas where Jatropha gossypifolia grows as weed.

Indian Journal of Agricultural Sciences, Jul 18, 2019

Herbicides, the most widely used agrochemicals, have high solubility in water which poses threat ... more Herbicides, the most widely used agrochemicals, have high solubility in water which poses threat to aquatic life and human health along with different sources of water. Therefore, selective, simple and reliable methods for detection as well as removal of these contaminants from different matrices are required. Amongst different available techniques, molecular imprinting is being used for selective detection of the target molecule amongst various analytes with the advantages of high sensitivity and low cost of production. To understand the interaction between the reactants and implement the technique on large scale, computational modeling has played a significant role. Molecularly imprinted polymers can be designed for specific detection of an individual or a class of herbicides by simulating and understanding the complex behavior of the system. In this review, the current status of different in silico strategies being used to design molecular imprinted polymers of different herbicides has been presented.

The Indian Journal of Agricultural Sciences

Agricultural waste-based adsorbents are becoming attractive choice for the removal of environm... more Agricultural waste-based adsorbents are becoming attractive choice for the removal of environmental pollutants from water due to their abundance and low cost. Batch adsorption studies were carried out with Parthenium hysterophorus L. (an invasive weed) to explore its potential for the removal of the anionic dye (Congo Red, CR) from simulated aqueous solutions. The experiment was conducted to study the effect of different parameters including contact time, pH (3-10), initial concentration and adsorbent dose on dye removal efficiency of the adsorbent. It was found that using the bioadsorbent, the sorption equilibrium for the dye could be achieved within 45 minutes at lower concentrations. The experimental data was analyzed through Freundlich and Langmuir adsorption isotherms. The data fitted better in Langmuir isotherm (R2=0.975). The results showed that the maximum adsorption capacity (Qm) is 14.49 mgg-1. The results so obtained indicate that the bioadsorbent can be used efficient...

Indian Journal of Chemical Technology

The feasibility of the removal of Reactive Red-141 (RR-141) by two different adsorbent materials ... more The feasibility of the removal of Reactive Red-141 (RR-141) by two different adsorbent materials namely zinc aluminium carbonate layered double hydroxide (ZAC-LDH) and calcined LDH (CZA-LDH) from aqueous solution has been investigated. To investigate the adsorption capacities of the adsorbent, batch mode adsorption studies has been performed for the removal of RR-141 using different parameters such as initial dye concentration, adsorbent dosage, contact time, temperature and pH. The various adsorption kinetic studies such as pseudo first order, pseudo second order and intra particle diffusion models are performed. The pseudo-second-order kinetic model is fitted well with high correlation coefficient. The optimum pH for maximum dye removal is found to be highly acidic (i.e., pH 2). Both Langmuir and Freundlich isotherm models described the adsorption mechanism of dye by both the adsorbents. The FESEM images and XRD pattern confirmed that the adsorption and intercalation of RR-141 dye molecule onto the adsorbents. The thermodynamic parameters like ∆Gº, ∆Hº and ∆Sº have also been calculated. Regeneration of calcined and its reusability has also been performed for the removal of RR-141. The results suggest that the efficiency of CZA-LDH is found to be good enough to remove RR-141 comparatively with the uncalcined LDH sample ZAC-LDH from aqueous solution.

Scientific Reports

Environmental crises, declining factor productivity, and shrinking natural resource is a threat t... more Environmental crises, declining factor productivity, and shrinking natural resource is a threat to global agricultural sustainability. The task is much more daunting in the Indo-Gangetic northern plains of India, where depletion of the underground water table and erratic rains due to the changing climate pose a major challenge to agriculture. To address these challenges a field investigation was carried out during 2016–2018 to test the efficacy of biopolymeric superabsorbent hydrogels namely Pusa Hydrogel (P-hydrogel: a semi-synthetic cellulose derivative-based product) and kaolin derivative of Pusa Hydrogel (K-hydrogel: semi-synthetic cellulose derivative) to assess their effect on crop and water productivity, soil moisture, root dynamics, and economics of soybean (Glycine max L.)–wheat (Triticum aestivum L.) system under three irrigation regimes namely full irrigation, limited irrigation and rainfed. The results revealed that the full irrigation along with P-hydrogel led to enhanc...

Archives of Agronomy and Soil Science

Indian Journal of Agricultural Sciences, Feb 10, 2021

Journal of Scientific and Industrial Research (JSIR), Aug 1, 2021

In the present study, cetyltrimethylammonium bromide (CTAB) was used to modify raw bentonite (Ben... more In the present study, cetyltrimethylammonium bromide (CTAB) was used to modify raw bentonite (Ben) through the replacement of exchangeable cations to form CTAB modified bentonite (CTAB−Ben). Both Ben and CTAB−Ben were characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy and Brunauer-Emmet-Teller (BET) analysis. Adsorption potential of Ben and CTAB−Ben were explored for the removal of two cationic dyes i.e. Rhodamine B (RB) and Crystal violet (CV) from aqueous solutions. The maximum dye adsorption capacity of CTAB−Ben was found to be 93.15 and 14.76 mgg-1 for CV and RB, respectively. The adsorption data of both the adsorbents was better explained by Freundlich isotherm whereas the pseudo second order (PSO) model better fitted the kinetics data. Regeneration studies revealed that CTAB−Ben could be reused upto five adsorption-desorption cycles.

Indian Journal of Chemical Technology (IJCT), Oct 20, 2020

Pesticide Research Journal, 2008

Degradation behaviour of the triazole fungicide, propiconazole 1-[2 (2,4-dichlorophenyl)-4-propyl... more Degradation behaviour of the triazole fungicide, propiconazole 1-[2 (2,4-dichlorophenyl)-4-propyl-1,3-dioxolane-2-yl methyl] 1 H-1, 2, 4-triazole, in canal water was investtgated. Canal water was spiked with propiconazole (Tilt 25 EC) at the rate of 0.0625 μg mL−1 (T1) and 0.125 μg mL−1 (T2) and kept in amber bottles. Water samples collected on 0(1 h), after spiking were processed for residues by liquid-liquid partitioning with dichloromethane. Residues were estimated by GLC - ECD equipped with capillary column. In T1, the dissipation recorded on 1, 3, 7, 15, 30, 60 and 90 days was 7.9, 17.5, 32.7, 46.1, 54.5, 76.4 and 83.2%. Corresponding dissipation in T2 was 8.4, 11.6, 32.8, 44.5, 52.11 74.8 and 81.5%. Thus in 90 days, more than 80% dissipation of propiconazole residues in water has been observed in both the treatments. The half life (DT50) values observed were 35.8 days in T1 and 38.2 days in T2 treatment.

Environmental crises, declining factor productivity, and shrinking natural resource threatened gl... more Environmental crises, declining factor productivity, and shrinking natural resource threatened global agricultural sustainability. The task is much more daunting in the Indo-Gangetic northern plains of India, where depletion of the underground water table and erratic rains due to the changing climate pose a major challenge to agriculture. To address these challenges a field investigation was carried out during 2016–18 to test the efficacy of biopolymeric superabsorbent hydrogels namely Pusa Hydrogel (P-hydrogel: a semi-synthetic cellulose derivative-based product) and kaolin derivative of Pusa Hydrogel (K-hydrogel: semi-synthetic cellulose derivative) to assess their effect on crop and water productivity, soil moisture, root dynamics, and economics of soybean (Glycine max L.)–wheat (Triticum aestivum L.) system under three irrigation regimes namely full irrigation, limited irrigation and rainfed. The results revealed that the full irrigation along with P-hydrogel led to enhanced gra...

A series of 3-(4-substituted phenyl)-5-(2/4-substituted phenyl) isoxazoles (XIX-XXIX) have been s... more A series of 3-(4-substituted phenyl)-5-(2/4-substituted phenyl) isoxazoles (XIX-XXIX) have been synthesized from 1 -(4-substituted phenyll-3-(4-substituted phenyll-2-propen-1 -one (VIII-XVIII). 3-(4-Hydroxy yhenyl)-5-(2/4-substituted phenyl) isoxazoles (XXVII-XXIX) on refluxing with epichlorohydrin in presence of potassium carbonate afforded 3-(4-oxiranylmethoxy phenyl)-5-(2/5-substituted phenyl)isoxazoles (XXX-XXXII). Further, compounds XXX-XXXII were treated with substituted phenols in presence of alcohol to afford compounds XXXVI-XLIV. All the compounds were characterized and screened for their nematicidal activity in vitro against Meloidogyne javanica at different concentrations. Some of the compounds have shown significant nematicidal activity.

Field study was carried out to investigate persistence and dissipation kinetics of thiodicarb (La... more Field study was carried out to investigate persistence and dissipation kinetics of thiodicarb (Larvin 75 WP) applied at the time of flower initiation stage of cotton crop (H-1117) @ 500 (T1) and 1000 g a.i.ha-1 (T2) during kharif season. The dissipation was 100% in soil at both the doses after 35 days of application following a first order kinetics. The half life value was observed to be 7.27 days in T1 and 7.81 days in T2, respectively.

International Journal of Environmental Analytical Chemistry, 2020

The purpose of this study was to determine the leaching behaviour of pyrethroids. Now days pyreth... more The purpose of this study was to determine the leaching behaviour of pyrethroids. Now days pyrethroids are applied largely in India, creating the need to evaluate potential leaching of pyrethroids. Thus leaching of bifenthrin and λ - cyhalothrin in sandy loam soil was evaluated under laboratory conditions with simulated rainfall of 300 mm. Bifenthrin was applied at 2 and 4 μg while λ -cyhalothrin was applied at 2 and 4 μg on soil columns, respectively. Maximum concentration of bifenthrin and λ -cyhalothrin was recovered from 0-5 cm depth in the soils. Results indicated the low mobility of both the insecticides under saturated moisture condition that may be significant in terms of ground water contamination Now a days pyrethroids .