The effects of different weed control measures on leaf area index and yield of three varieties of lowland rice under two planting methods were investigated during the 2005, 2006, and 2007 rainy seasons at the Irrigation Research Station, Kadawa, located in the Sudan savannah agro-ecological zone, Kano state, Nigeria. The experiments used a split-plot design and were duplicated three times, with a factorial combination of two planting techniques and three cultivars in the main plots and weed control treatments in the subplots. The results showed that rice transplanting raised leaf area index in 2006 and 2007, with a mean value of 12WAS / T for the three years. Transplanting also produced a greater paddy yield than direct sowing in 2006, as well as a three-year average value. In the 2005 cropping season, FARO 52 rice had a much greater leaf area index than FARO 50 and FARO 44 rice varieties. When compared to the other two kinds, FARO 52 had a better yield in 2006 and a higher three-year average. Pre-emergence oxadiazon at 1.0 kg per hectare, followed by post-emergence piperophos with propanil at 1.5 kg per hectare applied at 5 WAS / T, yielded the greatest mean paddy yield over the three years, closely followed by hand-pulling weed control, which yielded the lowest mean paddy yield. Pre-emergence oxadiazon at 1.0 kg per hectare followed by post-emergence piperophos plus propanil at 1.5 kg per hectare applied at 5 WAS / T in transplanted FARO 52 gave the highest mean paddy yield of 5.5 tonnes per hectare for the three years, compared to weedy check, which gave the lowest mean paddy yield of 2.6 tonnes per hectare for the three years. It can be concluded that transplanting the FARO 52 rice variety and combining pre-emergence oxadiazon application at 1.0 kg per hectare with post-emergence piperophos plus propanil application at 1.5 kg per hectare is the most economically viable integrated package for lowland rice production in the Sudan Savanna agro-ecological zones.
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