The Effect of Peptide Concentration on the Productivity of Robusta Coffee (Coffea Canephora L.)

This study is descriptive experimental research aimed at determining the effect of different peptide concentrations on the productivity of Robusta coffee (Coffea canephora L.) plants. The experiment was conducted using a Randomized Block Design (RBD) with a single factor treatment, namely peptide concentration (P), consisting of three levels: P₀ = 0 ml peptide/L water (control), P₂ = 2 ml peptide/L water, and P₄ = 4 ml peptide/L water. Each treatment was replicated ten times, resulting in a total of 30 Robusta coffee plants as samples. The observed variables included the number of flowers per plant, number of fruits per plant, fruit weight per plant, and bean weight per plant. The results showed that peptide application had a significant effect on all observed productivity parameters. The treatment with a concentration of 4 ml/L water (P₄) produced the best results compared to other treatments, as indicated by a significant increase in the number of flowers, number of fruits, as well as fruit and bean weight per plant. Peptide acts as a natural biostimulant that improves hormonal balance, enhances photosynthetic efficiency and nitrogen absorption, and strengthens plant tolerance to environmental stress. Therefore, the application of peptide at a concentration of 4 ml/L water is recommended as an effective and sustainable cultivation strategy to improve the productivity of Robusta coffee plants.