Herbicide combinations for control of complex weed flora in transplanted rice

Abstract

A field experiment was conducted to evaluate the bioefficacy of some potent low dose herbicides of sulfonylurea group in conjunction with other traditional recommended herbicides for control of broad spectrum of weeds in transplanted rice (Oryza sativa L) during the wet season of 2012 and 2013. Pretilachlor 750 g/ha as pre-emergence (PE) fb ethoxysulfuron 18.75 kg/ha as post-emergence or pretilachlor 750 g/ha followed by metsulfuron-methyl + chlorimuron-ethyl 4 g/ha or pyrazosulfuron 20 g/ ha (PE) followed by manual weeding were better options for efficient weed control, higher grain yield and B:C ratio in transplanted rice.

Effect of Weed Management Practices on Nutrient Uptake by Direct Seeded Upland Rice under Tripura Condition

“…This is simply due to higher grain and straw yield of the crop obtained from these treatments. Similar result was reported by Yakadri et al, (2016). Though the rice yield and gross return were the highest under hand weeding at 15, 30 and 45 DAS, the data on net income and return per rupee invested showed that it was less remunerative than pendimethalin at 1.0 kg ha -1 at 2 DAS + bispyribac sodium at 25 g ha -1 at 20 DAS and pendimethalin at 1.0 kg ha -1 + one manual weeding at 30 DAS which implied that it was uneconomic and unnecessary to give three hand weeding during the entire crop growth.The net income was found negative under weedy check due to greater competition between rice and weed which led to poor growth of the crop, lower grain and straw yield.…”

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

“…This is simply due to higher grain and straw yield of the crop obtained from these treatments and comparatively lower cost involved in the cultivation of crop under these treatments. Similar result was reported by Yakadri et al (2016). Though the rice yield and gross return were the highest under hand weeding at 15, 30 and 45 DAS, the data on net income and return per rupee invested showed that it was less remunerative than pendimethalin at 1.0 kg/ ha at 2 DAS + bispyribac-sodium at 25 g/ha at 20 DAS and pendimethalin at 1.0 kg/ha + one manual weeding at 30 DAS, which implied that it was uneconomic and unnecessary to give three hand weeding during the entire crop growth.…”

Effects of soil amendments and weeding regimes on growth and yield potential of rice (Oryza sativa L.) under different water sources in the Guinea Savanna

“…The results implied that controlling weeds on rice field twice or more will efficiently reduce weeds population and dry weight, leading to better nutrient, moisture and light uptake by crops. This is in agreement with Yakadri et al (2016) who reported that the application of herbicides alongside with manual weeding produced lesser weed dry matter accumulation than the weedy check. The increased weed biomass in no weeding treatment may be attributed to the fact that the weeds were not managed, which contributed to their growth and translated into increased biomass.…”

“…The maintenance of weed free conditions in rice fields is crucial to enhance grain yields. The results conform to other research where higher grain yield was found in weed free checks (Singh et al, 2018;Dzomeku et al, 2017;Yakadri et al, 2016;Hakim et al, 2013). The greater grain yield recorded by MF compared to CD and PL, though they were all applied at 60 kg N ha -1 which may be attributed to slow release of organic nutrients (CD and PL) compared to MF (Senayah, 2009).…”