Weed Dynamics and Rice Productivity under Various Tillage Practices in North East India

A field experiments were conducted during the kharif (wet) season of 2020 and 2021 at farmers field of lower Dzongu North Sikkim, India with rice variety abhishek a high yield variety developed from CRRI Cuttack for the study of weed dynamics and rice productivity under various tillage practices in North East India. From the experimental findings it revealed that rice field was infested with three categories of weeds viz. grassy, broadleaved and sedges were predominant throughout the cropping period. Results revealed that the amongst the tillage practices, minimum population of all weed flora (grasses, sedges and broadleaved) was recorded with no till at 30 DAP. This leads to about 16.9%, 11.6% and 23.1% reduction in grasses, sedges and broadleaved weeds over the conventional practices, respectively. However, at 60 DAP reverse scenario of weed dynamics has been observed in grasses and broad leaved. Similar trend was observed in case of dry weight. Grain yield was also significantly influenced by different tillage and organic nitrogen sources and the highest yield was recorded with NT (3.38 t/ha) followed by RT (3.25 t/ha) and lowest in CT (3.14 t/ha). With regard to organic sources of nutrients, application of 50% FYM+50% VC + Biofertilizer 100% RDN through (VC) recorded significantly maximum grain yield (3.68 t/ha) over other organic sources.