Subsidios para estudos de plantas invasoras no sul da Bahia, 1: Produtividade e fenologia
A 200 x 400 meter plot was cleared of all surface vegetation and, after 105 days, the number and frequency of weedy species present and their biomasses were determined. The frequencies and biomasses were used to rank the species in order of importance as weeds harmful to new cacao plantations. The 8 most importat species were: Brachiaria mutica, Ludwigia octovalvis, Cyperus distans, Paspalum conjugatum, Ludwigia hyssopifolia, Torulinium odoratum, Commelina nudiflora and Scleria pterota. An estimate of 477.7 g/m2 dry weight of net primary productivity for the 105 days was calculated (4.5 g/m2/day). This rate, if continued, would yield 16,425 kg/hectar/year. Monocotyledons provided nearly two times as much biomass as dicotyledons with Cyperaceae and Poaceae the two leading families in terms of net primary productivity. Observations of the phenology of this weedy community revealed that few plants had produced seeds before 105 days but that by the end of 5 months many seeds had been deposited in the soil. Based on these results preliminary recommendations for the control of weeds in newly established cacao plantations are made.
| Main Authors: | , , , , |
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| Format: | biblioteca |
| Published: |
1980
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| Subjects: | THEOBROMA CACAO, MALEZAS, FENOLOGIA, BAHIA, BRASIL, |
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