Weed communities of gogorancah rice and reflections on management
2000
Pane, H. | Sutisna Noor, E. | Dizon, M. and Mortimer, A. M.
Developing strategies to protect rice yields in the long term involves understanding the structure and dynamics of weed species in response to management. Where weed control is imperfect and farmers change rice crop establishment methods and control tactics, weed shifts can occur. Furthermore, in rainfed rice, the inherently complex abiotic nature of the cropping environment may result in variation in weed composition. A survey of the weed communities remaining after farm weeding practices was conducted during booting of gogorancah rice (dry-seeded bunded rice) in rainfed lowland areas of Pati and Rembang, Indonesia. Counts were made of all weed species present in four randomly placed 1-m2 quadrats at low, mid, and upperpoints of the land toposequence in fields at each of 25 farm sites. In addition, soil nutrient status, (pH, N, P, K, and organic matter) at each site was measured. Fifty six weed species covering 18 families were recorded. The average total weed density was 175 plants m2, with the greatest number of species occurring in upper toposequence locations. Canonical correspondence analysis was used to examine interrelationships among sampling sites based on species composition and nutrient status.
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