Abstract:, during the two successive seasons of 2000 and 2001, with the aim of investigating the effect of chemical, organic and biofertilization treatments on the growth, chemical composition and oil production of African marigold (Tagetes erecta L.) plants. In addition to the control, the fertilization treatments included: (1) N fertilization at the rates of 6 or 12 g ammonium sulphate /pot (N 1 and N 2 , respectively), (2) Bio-fertilization (Bio), (3) Bio + half the previous N fertilization rates (½ N 1 or N 1), (4)… Show more
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