MADRAS AGRICULTURAL JOURNAL

Management of Weed Seed Bank Using Nanoparticles in Combination with Pendimethalin and Hydrogen Peroxide in Irrigated Blackgram (Vigna mungo L.)

Abstract

                                Field experiments were carried at Agricultural College and Research Institute, Madurai, Tamil Nadu Agricultural University, Tamil Nadu, during kharif and rabi seasons of 2017 - 2018, to study the effect of nanoparticles in combination with pendimethalin and hydrogen peroxide on weeds and blackgram crop. The experiments were laid out in randomized block design with twelve treatments and replicated thrice using blackgram MDU 1 as a test variety. Among the weed control treatments, application of H2O2 followed by Pendimethalin + Ag nanoparticles recorded lower weed index, total weed dry weight, total weed density and with higher weed control efficiency and yield of black gram in both the seasons. It was comparable with the application of pendimethalin (0.75 kg a.i. ha-1) + hand weeding at 35 DAS.

Key words : Blackgram, Hydrogen peroxide, Zinc oxide, Silver Nanoparticles, Pendimethalin and Weed management.

Copyright @ 2019 Madras Agricultural Journal | Developed by Crystalpro All right reserved.

Copyright @ 2019 Madras Agricultural Journal | Developed by Crystalpro All right reserved.

MADRAS AGRICULTURAL JOURNAL

Biosorption of Chromium (III) from Aqueous Solution by Water Hyacinth Biomass

Abstract

                                Release of heavy metals into the environment is a matter of global concern for the past few years and it should be removed from industrial waste waters before discharge for maintaining water quality standards. This study involved the use of water hyacinth biomass as biosorbent for removal of Cr(III) from aqueous solution. The biosorbent was characterized by FTIR, SEM with EDAX. Batch experiments were conducted to determine the sorption isotherms, effect of solution pH, adsorbate concentration, contact time, biosorbent dosage and size. The results confirmed that water hyacinth biomass can remove Cr(III) from aqueous solution. The maximum sorption occurs at pH =5.0, biosorbent size= 0.2mm, biosorbent dosage=2.0g 100ml-1 of adsorbate, adsorbate / solute concentration= 100 mg L-1 Cr(III) at 25ºC at 250 rpm after 24 hrs. The rate of adsorption was rapid and equilibrium attained at 24hrs. Langmuir, Freundlich and Temkin isotherm models were used to analyze the equilibrium adsorption data. Langmuir isotherm fitted the data well with R2 value of 0.999. Overall, the powdered water hyacinth biomass could be utilized as effective low cost adsorbent for the removal of Cr(III) from waste water.

Key words : Adsorption, Cr Removal, Release kinetics, Water hyacinth

Copyright @ 2019 Madras Agricultural Journal | Developed by Crystalpro All right reserved.

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