Integrated weed management in direct-seeded upland rice under Tripura condition

Abstract

A field experiment was conducted at KVK, South Tripura during the Kharif season of 2013 and 2014 to study the integrated weed management in direct-seeded upland rice. The predominant weed flora in the experimental field were Amaranthus viridis, Oldenlendia corymbosa, Spilanthes acmella, Ludwigia parviflora, Cleome rutidosperma, Malvestrum coromondalianeum among the broad-leaf weeds, Digitaria sanguinalis among grasses and Cyperus iria among sedges. The results revealed that though the hand weeding thrice at 15, 30 and 45 DAS recorded lowest weed dry weight and the highest grain yield, it was not economically viable. The pre-emergence application of pendimethalin at 1.0 kg/ha at 2 DAS + bispyribac-sodium at 25 g/ha at 20 DAS recorded the highest net returns and return per rupee invested and appeared to be the most promising and remunerative weed management practices for direct-seeded rice under Tripura condition followed by pendimethalin at 1.0 kg/ha at 2 DAS + one hand weeding at 30 DAS.

Effect of nutrient and weed management on crop productivity and soil microbial properties in aerobic rice (Oryza sativa)

“…of grains/panicle and grain and biological yield. Similar findings were recorded by Jabran et al (2012) and Chakraborti et al (2017). Soil microbiological properties: Soil microbiological properties in terms of microbial biomass carbon (MBC), microbial biomass nitrogen (MBN) and microbial biomass phosphorus (MBP) were influenced significantly by the nutrient and weed management practices during both the years, however the interaction was non-significant (Table 2).…”

Integrated Use of Herbicide and Weed Mulch with Closer Spacing for Weed Management in Dry Direct Seeded Rice

“…The productivity of the DSR is often reported to be lower, mainly due to problems associated with weed management. Aerobic soil conditions and dry-tillage practices, besides alternate wetting and drying conditions, are conducive for germination and growth of highly competitive weeds, which cause grain yield losses of 50-91% (Duary et al, 2005;Naresh et al, 2011;Mathew et al, 2013;Verma et al, 2016;Chakraborti et al, 2017aChakraborti et al, , 2017bDash and Duary, 2020). Application of herbicide is easy, rapid and more effective than other methods.…”