EFFETS DES EXTRAITS DE LA SPIRULINE SPIRULINA PLATENSIS SUR LES DEFENSES NATURELLES DES PLANTES.

Abstract

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.