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SUMMARY The percentage dry matter of some Nigerian vegetables increases with age.Corchorus olibriusgave the highest yield of vitamin C after five weeks, but the stage of maturity had less effect with other vegetables. The oxalic acid content ofCelosea argenteawas very high, approaching a lethal level. It appears that some of the vegetables are best at about six weeks from sowing from the standpoint of eating quality, oxalic acid and vitamin C content.
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O. L. Oke (1968) studied this question.
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