Author(s):

Gunjan Guleria, SS Rana and Amit Kumar Singh

Abstract: The present investigation was undertaken in a long-term experiment on IPNS in rice-wheat cropping system. Twelve treatments viz., control (no fertilizer/manure), 50, 75 and 100% NPK each to rice and wheat through fertilizers, 50% NPK to rice and 100% NPK to wheat through fertilizers, 50% substitution of N through FYM, wheat straw and green manure in rice and 100% NPK through fertilizers in wheat; 25% substitution of N through FYM, wheat straw and green manure in rice and 75% NPK through fertilizers in wheat; and farmers’ practice (40% NPK through fertilizers to each crop plus 5 t FYM/ha on dry weight basis to rice) were evaluated for a period of two years (2014 and 2015) with four replications. Ammannia baccifera was the most dominant weed constituting 40 and 35% of the total weed flora during kharif 2014 and 2015, respectively. This was followed by Monochoria vaginalis, Eleocharis sp., Scirpus sp., Echinochloa sp. and Cyperus difformis during 2014 and Monochoria vaginalis, Brassica sp., Eleocharis sp., Scirpus sp., Cyperus difformis and Cynodon dactylon during 2015. On an average Ammannia baccifera was the most dominant and problematic weed found in rice.

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