OICC Press International Journal of Recycling of Organic Waste in Agriculture 2251-7715 2026 07 13 Physiological Aspects, Growth, and Leaf Nutrient Contents of Sweet Potato under Organic Management 1057647/ijrowa.2026.1504.31 EN Micaela Benigna Pereira Federal University of Campina Grande, Pombal- PB, Brazil https://orcid.org/0009-0000-5942-0200 Reynaldo Teodoro De Fatima Federal University of Campina Grande, Pombal- PB, Brazil Jean Télvio Andrade Ferreira Federal University of Recôncavo da Bahia, Cruz das Almas-BA, Brazil Jackson Silva Nobrega Federal University of Western Pará, Rurópolis-PA, Brazil Walter Esfrain Pereira Federal University of Paraiba, Areia-PB, Brazil. Manoel Bandeira Albuquerque Federal University of Paraiba, Areia-PB, Brazil. Journal Article 2026 07 13 Purpose: The use of mulch and organic fertilizer in semi-arid regions are ecological practices capable of promoting production and reducing pressure on agricultural production systems. The objective was to evaluate the biomass production and physiological and nutritional aspects of sweet potatoes under mulch and organic fertilization in the Brazilian semi-arid region. Method: The experimental design was in randomized blocks, in an incomplete factorial arrangement 5 × 5 + 2 corresponding to the levels of cattle manure (CM) (0.0, 8.72, 30, 51.28, and 60 t ha-1) and mulching (M) (0.0, 287.73, 989.50, 1691.27, and 1979.0 g m-2), and two additional treatments (I- control; II- fertilization with NPK 40-70-90 kg ha-1), with treatments obtained by the Box-Wilson Central Composite Design. Results: Based on the results obtained, it is possible to affirm that the adoption of organic management in the sweet potato production system, with techniques such as cattle manure incorporation and mulching, is feasible from the perspective sustainable for producers in the semi-arid region of Brazil. Conclusion: Fertilization with cattle manure and mulch increased the synthesis of photosynthetic pigments, the number of leaves, the length and diameter of the main stem, the leaf area, the fresh and dry biomass of the aerial part and the N content in potato leaves sweet. The best plant performance was provided by the interaction between CM (28.4 to 60.0 t ha-1) and M (1979.0 g m-2). The joint application of CM and M was more efficient than mineral fertilizer with NPK. Highlights ·        Organic fertilization with cattle manure and mulch increases biomass production. ·        Organic management increases chlorophyll synthesis in sweet potato crops. ·        Mulch and cattle manure promote main stem growth. ·        Organic sweet potato management outperforms mineral fertilization with NPK. ·       Sustainable technologies for sweet potato cultivation in the semiarid region.