Browsing by Author "RATHNASIRI, A.D.R.S."

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    EVALUATION OF DIFFERENT WEED MANAGEMENT PRACTICES IN MACHINE TRANSPLANTED RICE CULTIVATION
    (Uva Wellassa University of Sri Lanka, 2017) RATHNASIRI, A.D.R.S.
    Farmers have been introduced machine transplanting of rice under Yaya ii programme, by the Department of Agriculture in Sri Lanka. As the inter row spacing of the transplanting machine is fixed 30 cm, it allows a more room for weed infestation in the field, finally resulting a significant yield loss. Thus, weed management is an essential practice in machine transplanting. So, this study was conducted to find a better weed management option in machine transplanting of rice at RRDI, Batalagoda during Yala 2017 The main objective of this study was to evaluate the performances of different weed management practices in machine transplanted rice cultivation. And also to quantify the weed controlling efficiency of different weed management practices. Seven (07) treatments such as TI -Pretilachlor 300g/l EC (Soffit), T2-Pretilachlor 300g/l EC followed by weedering at 2 weeks after transplanting (WATP), T3-Weedering alone twice at 2 WATP and 4 WATP, T4-Pretilachlor 300g/l+Pyribenzoxim 20g/l EC (Solito), T5-Pretilachlor 300g/l+Pyribenzoxim 20g/l EC .followed by weedering at 2 WATP, T6-Hand weeding and T7-Un-weeded control. Bg300 was selected as the test variety. Experimental design was Randomized Complete Block Design (RCBD) with 03 replicates. Crop establishment was done using machine transplanter. Pretilachlor 300g/l + Pyribenzoxim 20g/l EC followed by weedering using mechanical weeder at 2 WATP was the best weed management practice for controlling weeds in machine transplanted rice cultivation Key Words: Machine transplanting, Weed controlling methods, Pretilachlor 300g/l EC, Pretilachlor 300g/l + Pyribenzoxim 20g/l EC