Effect of in-situ paddy residue management, wheat varieties and pyroxasulfone on soil enzymatic activities in wheat (Triticum aestivum) in rice-wheat system
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Keywords:
dehydrogenase, herbicide residues, Urease, pyroxasulfone, alkaline phosphataseAbstract
Managing paddy residues and herbicide resistant Phalaris minor have been foremost challenges in wheat production in irrigated rice wheat system in NW India. The current study investigated the effect of in-situ paddy residue management methods, wheat varieties and of pyroxasulfone herbicide on soil health through their effect on soil enzymatic activities. The two wheat varieties (namely PBW 869 and 766) were sown with four in-situ paddy residue management machines (smart seeder, PAU happy seeder, super and mittar seeder) having variable paddy residue management scenarios, and sprayed with pyroxasulfone 127.5 kg ha-1 and kept unsprayed as well, in winter season of 2021-22 and 2022-23 at Ludhiana. All paddy residue management methods and wheat varieties exhibited similar dehydrogenase, alkaline phosphatase and urease activities. Pyroxasulfone application temporarily inhibited the dehydrogenase and alkaline phosphatase activity at 60 days after herbicide application whereas urease activity remained unaffected. Harvest time residues of pyroxasulfone in soil, wheat grain and wheat straw remained below detectable limits (<0.01 µg g-1) .
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