Ricefield weeds in South Andaman, India
1987
Singh, D. | Gangwar, B. (Central Agricultural Research Inst., Port Blair (India))
Weeds were surveyed in 103 randomly selected rice fields in 14 locations of South Andaman during Oct 1986. Percentage cover for all weed species was assessed in 51 clay loam soil and 52 clay soil fields between heading and flowering. Forty weed species belonging to 13 families were identified: 30% were Cyperaceae and 27.5% Poaceae. Thirty-nine species were found in clay loam fields, 38 in clay fields, 37 were common to both conditions. Eleocharis dulcis was not found in clay loam fields. Ageratum conyzoides, and Spilanthes paniculata were not found in clay fields. Fimbristylis miliacea was predominant in all the clay loam and 94% of the clay fields surveyed. Echinochloa colona, Ludwigia hyssopifolia, Torenia violacea, and Cyperus rotundus were almost equally important in both soil types. Scirpus juncoides and Monochoria vaginalis in clay fields and Cyperus difformis in clay loam fields were also important.
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