Authors:
Bello, S., Ahanchede, A., Amadji, G. L. and Maliki R. ,Benin |
Abstract:
The present study has been conducted in order to put into relation the continuous farming
duration, the soil texture and fertility level, the dominant species presence, the weed covering
degree with the onion’s bulb yield. it aims to determine also the term of putting onion’s plots into
fallow or abandonment in the North-East of Benin. Thirty-two onion plots have been considered
in two villages named Kargui and Toumboutou, located respectively in the communes of
Malanville and Karimama. Collected data have been submitted to one factor regression analysis
with the general linear model and to the principal components analysis (PCA). Results have
shown a quanlitative evolution of the flora characterized, depending on the soil texture, which is
characterized by the erosion of the specific diversity. and its specialization by Cyperus rotundus
and Portulaca quadrifida in a long term. This transformation of the flora in relation with the
continuous crop duration is relative to the soil fertility and the onion’ yield declining, which
cause abandonment or fallow lying of plots for which these species are indicators. Concerned
weeds are Boerhavia diffusa, Commelina benghalensis, Commelina diffusa, Cyperus tuberosus
and especially Cyperus rotundus and Portulaca quadrifida which appear as dominant with the
continuous cropping duration |
