Effets Des Extraits De La Spiruline Spirulina Platensis Sur Les Defenses Naturelles Des Plantes.

Résumé: This study explores the biostimulant effects of Spirulina platensis extracts on the growth and yield of pepper plants (Capsicum annuum), with the aim of providing a natural alternative to chemical pesticides and fertilizers. Three concentrations of spirulina extract (5%, 10%, and 15%) were tested, with an untreated control group as a reference. The main parameters measured included stem length, leaf size, number of flowers, number of fruits, and average fruit weight. The results showed a significant positive impact of spirulina extracts on plant growth. The 15% concentration yielded the best results, with an increase in stem length (+25%), leaf size (+30%), and the number of flowers and fruits per plant (+35%) compared to the control. The average fruit weight increased by 20% for plants treated with 10% and 15% concentrations. The overall yield per plant was maximized at 15%, showing an increase of nearly 40% compared to the control. These results demonstrate that the use of Spirulina platensis extracts can effectively stimulate the growth and productivity of pepper crops, offering a promising alternative to reduce dependence on chemical inputs and promote sustainable agriculture. The large-scale adoption of these natural biofertilizers could represent a significant advancement for ecological farming.

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