Effect of Herbicide residues on Soil Microorganisms in Turmeric  

E. Sathiyavani1 , N. K. Prabhakaran2 , C. Chinnusamy3 , R. Shanmugasundram2 , K. Soorianathsundaram4
1. Department of Agronomy, Tamil Nadu Agricultural University, Coimbatore, Tamil Nadu, INDIA
2. Professor, Department of Soil Science & Agricultural Chemistry, Tamil Nadu Agricultural University, Coimbatore, Tamil Nadu, INDIA
3. Dean, Tamil Nadu Agricultural University, Madurai, Coimbatore, Tamil Nadu, INDIA
4. Professor, Department of Horticulture, HC & RI, TNAU, Coimbatore, Tamil Nadu, INDIA
Author    Correspondence author
International Journal of Horticulture, 2015, Vol. 5, No. 3   doi: 10.5376/ijh.2015.05.0003
Received: 18 Feb., 2015    Accepted: 03 Mar., 2015    Published: 12 Mar., 2015
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This is an open access article published under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Preferred citation for this article:

Sathiyavani et al., 2015, Effect of Herbicide residues on Soil Microorganisms in Turmeric, International Journal of Horticulture, 2015, Vol.5, No.3 1-12 (doi: 10.5376/ijh.2015.05.0003)

Abstract

Field investigation were undertaken to evaluate the integratedweed management with pre and post emergence herbicides in turmeric at the Agricultural Research Station, Bhavanisagar of Tamil Nadu Agricultural University, during kharif season of 2012 and to elucidate information on bacterial, fungal and actinomycetes population due to the effect of herbicide residues. The bacterial, fungal and actinomycetes populations were recorded at 3, 15, 25, 50 and 75 DAP. The experiments were laid out in Randomized block design with three replications. The treatments comprised of different weed management practices wherein PE herbicides viz., metribuzin 0.7 kg ha‑1, pendimethalin 1.0 kg ha‑1 andatrazine 0.75 kg ha‑1 followed by either POE fenoxaprop 67 g ha‑1 + metsulfuron 4 g ha‑1 (Tank mix) on 45 DAP or HW on 45 and 75 DAP or straw mulch 10 t ha‑1 on 10 DAP + HW on 75 DAP, all PE oxyfluorfen 0.30 kg ha‑1, PE oxadiargyl 0.25 kg ha‑1, POE glyphosate 1.03 kg ha‑1 and 1.54 kg ha‑1 on 25 DAP followed by HW on 45 and 75 DAP, HW on 25, 45 and 75 DAP and unweeded check were imposed. In both the experiments, observations were recorded on soil microorganisms viz., populations of bacterial, fungal and actinomycetes were observed at different days after planting of rhizome. In this experiments showed herbicide application of PE metribuzin 0.7 kg ha-1,PE pendimethalin 1.0 kg ha-1, PE atrazine 0.75 kg ha-1,PE oxyfluorfen 0.3 kg ha-1 and PE oxadiargyl 0.25 kg ha-1 recorded significantly lower microbial population immediately after herbicide spraying (3 DAP) than the treatments not having any herbicides and thereafter increased.

Keywords
Herbicide residues; Soil microbial populations; Turmeric
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