MADRAS AGRICULTURAL JOURNAL

Screening of Piper Species for Resistance to Quick Wilt caused by Phytophthora capsici under Glasshouse Condition

Abstract

                               Screening of Piper species resistant to quick wilt was carried out under glasshouse conditions. Piper colubrinum, Piper argyrophyllum, IISR Sakthi and IISR Thevam were used as rootstocks while Panniyur 1 and Karimunda were used as scion and these grafted plants were screened against Phytophthora capsici. Among the rootstocks, Piper colubrinum showed ‘Highly Resistant’ reaction, followed by Piper argyrophyllum which exihibited ‘Resistant’ reaction. The cultivated Piper nigrum varieties IISR Sakthi and IISR Thevam showed ‘Tolerant’ reaction and the scions Panniyur 1 showed ‘Highly Susceptible’ reaction while Karimunda showed ‘Resistant’ reaction. None of the graft combination screened were susceptible to Phytophthora capsici.  Highest graft success was observed in Piper colubrinum.

Key words : Black pepper, Phytophthora capsici, Screening, Piper colubrinum, Grafting.

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