Rotation of vegetable crops/snail rearing in Southern Benin
1993
Assogba, F. | Ehouinsou, M.
In a system rotating vegetable crops/snail rearing, the effect of manure based on snail faeces on the productivity of lettuce has been studied in southern Benin, characterized by a Guinea type climate and a degradated ferralitic soil commonly named as (alfisoil) 'Terre de barre'. The tested rotation system in an alternate biannual type where three forms of manure have been utilized: - mineral manure (N15 P15 K15), - organic manure (snail faeces or trashes) combination of organic manure/mineral manure, that is snail faeces and N15 P15 K15. Five treatments were tested corresponding to the mode of manure which is either organic manure alone, or organic manure added with mineral manure applied at three levels: 0 g, 125 g, 250 g per plot of 7.2 square meter. The results obtained showed a quite good plant development for all treatment except on plots where only trashes were used. The highest yield in green salad (150 kg per 100 square metre per plot on the average) has been obtained on the plot where snails were reared in the first year and where in second year the average dosage of mineral manure (125 g of N15 P15 K15) was applied. We can temporarily conclude that snail faeces, combined with an average dosage of chemical fertilizer would insure a good production of lettuce.
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