Papers

EFFECT OF INTEGRATED WEED MANAGEMENT AND SPACING ON THE WEED FLORA AND ON THE GROWTH OF TRANSPLANTED AMAN RICE (Pages : 55 - 64)

M. ALI, M. S. A. SARDAR, P. K. BISWAS AND A. K. M. S. B. MANNAN

An experiment was carried out at the Agronomy field, Sher-e-Bangla Agricultural University, Dhaka during the period from July to December, 2006 to evaluate the effect of integrated weed management and spacing on the weed flora and on the growth of transplanted aman rice. The experiment comprised of six weeding treatments viz. no weeding, two hand weeding at 15 and 40 days after transplanting (DAT), one weeding with BRRI push weeder at 15 DAT + one hand weeding at 40 DAT, pre-emergence application of M.Chlor 5G (Butachlor) at 5 DAT + one hand weeding at 40 DAT, pre-emergence application of Oxastar 25 EC (Oxadiazon) at 5 DAT + one hand weeding at 40 DAT, pre- emergence application of Rifit 500EC (Pretilachlor) at 5 DAT + one hand weeding at 40 DAT and three plant spacings viz. 20cm x 10cm, 25cm x 15cm and 30cm x 20cm. It was evident that among the weed control treatments Pretilachlor + one hand weeding was found the best for controlling weeds at 30 DAT (79.53%) and moderate for controlling weeds at 60 DAT (75.65%) which ultimately gave the highest plant height (137.20 cm), total tillers hill -1 (20.13) and moderately contributed to the leaf area index (5.30) that resulted the higher plant dry matter (23.62 g hill -1 ) at 60 DAT and higher crop growth rate (0.71 g hill -1 day-1 ) at 45-60 DAT. Among the spacings, the widest spacing (30cm x 20cm) contributed to the highest weed control efficiency (55.30 %) at 30 DAT and the lowest weed control efficiency (62.03%) at 60 DAT and gave the highest growth parameters except LAI. The best growth performance showed by Pretilachlor at the spacing of 25cm x 15cm and after that by BRRI push weeder + one hand weeding at the spacing of 30cm x 20cm. Download


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