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Weed population dynamics under ‘jhum’ (slash and burn agriculture) and terrace cultivation in northeast India

The pattern of emergence, survival and mortality of six weed species and the dynamics of total weed population were studied for 2 years in potato fields under slash and burn (‘jhum’) and terrace cultivation in Meghalaya, northeast India. The composition of the weed flora in ‘jhum’ and terrace fields...

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Published in:Agriculture, ecosystems & environment ecosystems & environment, 1992, Vol.41 (3), p.285-295
Main Authors: Misra, J., Pandey, H.N., Tripathi, R.S., Sahoo, U.K.
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Language:English
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creator Misra, J.
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description The pattern of emergence, survival and mortality of six weed species and the dynamics of total weed population were studied for 2 years in potato fields under slash and burn (‘jhum’) and terrace cultivation in Meghalaya, northeast India. The composition of the weed flora in ‘jhum’ and terrace fields was similar, however, the population density was generally higher in the former. Weed seedlings appeared at three different times during both autumn and summer cropping seasons, giving rise to three distinct cohorts. The overall pattern of weed seedling emergence differed among cohorts and from species to species. The effect of cropping season on mortality patterns of seedling cohorts was not significant. For all weed species early cohorts showed high mortality during the 45 days after emergence, but in the third cohort mortality rate was almost constant throughout life. During the cropping period, seedling recruitment rate ( K) and fecundity rate ( F) were higher in terrace than in ‘jhum’, but the survivorship ( P) was greater in the latter. High annual rate of increase in weed seeds (λ) in soil and low seedling recruitment rate appear to be the main causes of larger weed-seed populations in ‘jhum’ fields compared with the terraces. The larger soil seed bank in ‘jhum’ than in terrace eventually contributed to a larger weed population in the former.
doi_str_mv 10.1016/0167-8809(92)90116-S
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Soil science and plant productions</subject><subject>Biological and medical sciences</subject><subject>brulage</subject><subject>burning</subject><subject>cultivo en terrazas</subject><subject>culture en terrasse</subject><subject>densidad de la poblacion</subject><subject>densite de population</subject><subject>emergence</subject><subject>emergencia</subject><subject>evolucion de la poblacion</subject><subject>evolution de la population</subject><subject>Fundamental and applied biological sciences. Psychology</subject><subject>Generalities, botany, ecology, damages, economic importance</subject><subject>inde</subject><subject>india</subject><subject>levee</subject><subject>malezas</subject><subject>mauvaise herbe</subject><subject>Parasitic plants. Weeds</subject><subject>Phytopathology. Animal pests. 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subjects Agronomy. Soil science and plant productions
Biological and medical sciences
brulage
burning
cultivo en terrazas
culture en terrasse
densidad de la poblacion
densite de population
emergence
emergencia
evolucion de la poblacion
evolution de la population
Fundamental and applied biological sciences. Psychology
Generalities, botany, ecology, damages, economic importance
inde
india
levee
malezas
mauvaise herbe
Parasitic plants. Weeds
Phytopathology. Animal pests. Plant and forest protection
plantulas
plantule
population change
population density
quema
seedlings
solanum tuberosum
terrace cropping
Weeds
title Weed population dynamics under ‘jhum’ (slash and burn agriculture) and terrace cultivation in northeast India
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