MADRAS AGRICULTURAL JOURNAL

Mechanized Sowing and Sprinkler Method of Irrigation for Summer Irrigated Blackgram

Abstract

                                The productivity of pulse crop is low due to two reasons ; cultivation on agriculturally marginal soils and little application of any crop inputs. Among production inputs, irrigation plays a crucial role in enhancing productivity levels. Population maintenance is one of the essential criteria by which yield is affected very much. Three-year research (2015-2017) was conducted at AEC&RI, Kumulur during summer season. Among method of establishment, seeding by machine at raised bed has achieved higher plant population (39.50/ m2), higher number of branches (3.81) per plant, higher number of seeds (3.95) per plant and higher seed yield per (2.61 g) plant, whereas method of sowing by machine at flatbed also on par with the performance on number of branches per plant, number of seeds per pod, per plant seed yield in all the three years. Increase in the quantity of seed rate has achieved increase in plant population, but the seed rate @25 kg/ha has achieved higher number of branches per plant (4.13), higher number of pods (4.50) per plant, per plant seed yield (4.33). Sprinkler method of irrigation required eight numbers of irrigation with the quantity of 431.2 mm and achieved water savings of 14.5% compared to conventional method of irrigation and recorded higher water use efficiency of 2.08kg/cm3. Considering the cost of cultivation, net return and BCR, the treatment combination of sowing by machine at flatbed with the seed rate of @25 kg/ha under sprinkler method of irrigation, has achieved the higher yield (1298 kg/ha) and BCR (4.96).

Key words : Sprinkler irrigation, Water use efficiency, Plant density, Machine sowing..

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.