Study of Potassium Fertilization on Some Antinutritional Factors in Two Pineapple Varieties Cultivated in Côte D’ivoire during Postharvest Storage

Abstract

This study evaluated the effect of potassium fertilization on the physical characteristics and certain antinutritional factors (oxalates, phytates, and tannins) of two pineapple varieties (Ananas comosus L. Merr.), MD2 and smooth cayenne, cultivated in Côte d’Ivoire and stored under conditions simulating export. A randomized block experimental design was established with four increasing doses of K₂O (20, 28, 34, and 40 g/plant). The parameters measured included fruit diameter, pulp core diameter, average weight, percentage of exportable fruits, as well as oxalate, phytate, and tannin contents. Results showed that an application of 34 g K₂O/plant optimized weight, size, and percentage of exportable fruits while reducing concentrations of antinutritional compounds, particularly tannins. The MD2 variety exhibited better physical performance and lower oxalate and phytate contents compared to smooth cayenne. Beyond the optimal dose, a slight decline in performance was observed, suggesting that excess potassium may induce nutritional imbalances. These findings confirm the importance of a rational management of potassium fertilization to reconcile yield, market quality, and nutritional value, thereby strengthening the competitiveness of the Ivorian pineapple sector in export markets.