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Evaluation of Flair 50 EC Herbicide for Weed Control in Rice Paddy Fields. BY MWANGI.J; WANJOGU R.K, OWILLA B.P.O. Introduction. A round 80% of Kenya ’ s national rice production is from the national irrigation schemes controlled by NIB.
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Evaluation of Flair 50 EC Herbicide for Weed Control in Rice Paddy Fields BY MWANGI.J; WANJOGU R.K, OWILLA B.P.O
Introduction • Around 80% of Kenya’s national rice production is from the national irrigation schemes controlled by NIB. • Weed control is an important practice in crop production as weeds compete with crops for nutrients and soil moisture thereby affecting final yields realized. • It costs approximately Kshs 3,000/= for one hand weeding per acre. • Under the circumstances it is prudent to consider alternative ways for weed control in paddy fields • In Kenya use of herbicides for weed control in paddy fields is a relatively new phenomenon and very few products have so far been screened for efficacy OBJECTIVE: • Evaluate the efficacy of FLAIR 50 EC herbicide in weed control in rice fields
Examples of common rice weeds Ludwigia adscendens Monochoria vaginalis Scirpusjuncoides(Bulrush) Leptochloa chinensis
Methodology Rice Varieties: • V1 = Basmati 370, • V2 = BW 196, • V3 = IR2793, • V4 = ITA 310 Treatments • The trial had 5 treatments as follows: • Untreated control. • Recommended rates for Satunil herbicide • 1L/Ha Flair EC • 1.5L/Ha Flair EC • 2L/Ha Flair EC The treatments were sprayed 3-5 days after transplanting
Methodology cont. • Data Collection • Ten (10) hills were randomly selected and the following data taken; • Weed count • Plant Height • Efficacy of weed control (weed count, identification of weeds controlled) Toxicity of herbicide on rice crop • Crop injury (Phytotoxicity) recorded on a scale of 0 – 5 where • 0= No Phytotoxicity • 1 = very slight Phytotoxicity (<5%) • 2 = Slight Phytotoxicity (5 – 10%) • 3 = Significant Phytotoxicity (10 – 20%) • 4 = Serious Phytotoxicity (>20% • 5 = Total burn-down of crop Data was collected at 5thday after application and at interval of 5days after application for six times • Yieldfrom 5M2, at 14% MC Yield Components • Number of tillers/hill • Number of productive tillers/hill • Number of grains/panicle • Number of empty grains/panicle • 1000 grain weight (at 14% MC) • Milling quality
Results for variety IR2793 Growth data Season 1
Effect on weed count Season 1
Effect on yield Season 1 Season 2
Conclusion • From the results; • Plots that were not sprayed with any chemical had significantly lower number of tillers. • The number of most of the weeds were significantly and consistently low in satunil and flair EC treated plots. • However in most of the cases, there were no significant differences on weed counts between the different concentration of flair EC as well as satunil. • Also plots treated with 1l/ha and 1.5l/ha of flair EC had significantly higher numbers of filled grains compared to Satunil and the control. • This clearly indicates that Flair EC is a potential effective herbicide in rice farming.