Enzyme dynamics and organic carbon status of soil as influenced by flucetosulfuron in wet seeded rice

S. R. Arya, Elizabeth K. Syriac, B. Aparna

Abstract


A study was under taken during the Kharif and Rabi seasons of 2016-’17 in Kalliyoor Panchayat, Nemom block, Thiruvananthapuram district, Kerala, India (8.44550 N and 76.99180 E) to assess the effect of the herbicide flucetosulfuron on soil enzymes viz., dehydrogenase, acid phosphatase, and urease and organic carbon content of soil under wet seeded system of rice cultivation. The experiment was laid out in Randomised Block Design (RBD) with 12 treatments replicated thrice. Flucetosulfuron @ 20, 25 and 30 g ha-1 applied at 2-3, 10-12 and 18-20 days after sowing (DAS) along with two control treatments viz., hand weeding at 20 and 40 DAS and unweeded control comprised the treatments. In the case of dehydrogenase enzyme activity and organic carbon content, at 15 and 30 days after herbicide application, during both the seasons, the dose 25 g ha-1 was found to be the best when applied at 10-12 and 18-20 DAS compared to 2-3 DAS. Significant and positive correlation was noticed between dehydrogenase enzyme and organic carbon content of the soil. Acid phosphatase enzyme activity was found to be non-significant at 15 and 30 days after herbicide application, during both the seasons. It was also observed that herbicide application could increase the urease enzyme activity irrespective of dose and time of application, in both the seasons. Overall, the results revealed that none of the major enzymes were harmfully influenced by the sulfonyl urea herbicide, flucetosulfuron at the tested doses and time of application.


Keywords


Acid phosphatase, Dehydrogenase, Flucetosulfuron, Soil enzymes, Soil health, Urease

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References


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