Weed Research (1994) 34, 157-165

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U.K. Sahoo, R.S. Tripathi, H.N. Pandey and J. Misra (1994)
Population dynamics of buried weed seeds as influenced by shifting and terrace cultivation in the humid subtropics of India
Weed Research 34 (3), 157-165
Abstract: Change in the viable seed populations of three weed species, Galinsoga ciliata (Rafin) Blake, Polygonum alatum Buch. Ham. and Spergula arvensis L. in soil was studied in potato, radish, cabbage and cabbage+radish (mixed together) fields under shifting agriculture (locally called jhum) and terrace cultivation in northeast India from October 1988 to September 1989. The effect of weeding frequency on the viable weed seed populations of these weeds was also investigated. In most fields seed populations were smaller during the rainy season than during other seasons. Initially, the viable seed populations of all three weed species showed a significant (P<0.05) decrease with increasing soil depth in all crop fields under jhum cultivation. However, there was no clear trend in the terraced fields. At the end of the study period the trend was not clear in all crop fields under either jhum or terrace cultivations. In the 'normally weeded plots' the viable seed populations of S. arvensis and P. alatum recorded about a 2% increase in jhum fields, while in the terraced fields they showed a loss of 4% over the 1-year period. The 'frequently weeded plots' however, showed a sharp decline in viable seed populations in all crop fields.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website

Research topic(s) for pests/diseases/weeds:
environment - cropping system/rotation
control - general

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Galinsoga quadriradiata (weed) Cabbage (Brassica oleracea) India
Galinsoga quadriradiata (weed) Potato (Solanum tuberosum) India
Galinsoga quadriradiata (weed) Radish (Raphanus sativus) India
Spergula arvensis (weed) Cabbage (Brassica oleracea) India
Spergula arvensis (weed) Potato (Solanum tuberosum) India
Spergula arvensis (weed) Radish (Raphanus sativus) India
Persicaria nepalense (weed) Cabbage (Brassica oleracea) India
Persicaria nepalense (weed) Potato (Solanum tuberosum) India
Persicaria nepalense (weed) Radish (Raphanus sativus) India