Improving the fertilizer value of sugarcane wastes through phosphate rock amendment and phosphate-solubilizing bacteria inoculation

Autor(es)

Lopes, Cintia Masuco ^[1] ; Miranda Silva, Antonio Marcos ^[1] ; Estrada-Bonilla, German Andres ^[2] ; Ferraz-Almeida, Risely ^[1] ; Vilela Vieira, Jose Luis ^[1] ; Otto, Rafael ^[1] ; Vitti, Godofredo Cesar ^[1] ; Bran Nogueira Cardoso, Elke Jurandy ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Luiz de Queiroz Coll Agr, Soil Sci Dept, Ave Padua Dias 11, Piracicaba, SP - Brazil

^[2] Colombian Corp Agr Res AGROSAVIA Tibaitata, Mosquera, Cundinamarca - Colombia

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF CLEANER PRODUCTION; v. 298, MAY 20 2021.
• Citações Web of Science: 0

Resumo

Composting of by-products from the sugarcane (Saccharum spp.) industry can help achieve sustainable biofuel production by replacing mineral fertilizers and adequate residual disposal. The hypothesis was that the compost of filter cake and ash enriched with/without phosphate rocks (apatite-A and phosphorite-P) and phosphate-solubilizing bacteria can replace mineral P fertilizers and improve sugarcane production. A compost was produced from a mixture of filter cake and ash in 60 days of composting. The compost + A and the compost + P (with/without bacteria) were applied at sugarcane planting to supply 150 kg ha(-1) P2O5. Yield and quality of sugarcane, soil P dynamics, and enzyme activities in the soil were monitored. Results showed that the application of 20 Mg ha -1 of compost increased sugarcane yield (up to 6%) and b-glucosidase activity (up to 15%) when compared to mineral control. Adding phosphate rock in compost allowed a reduction in the total compost amount from 20 to 10 Mg ha(-1), with similar yields. Bacteria inoculation increased sugarcane yield (up to 5%) and acid phosphatase activity (up to 6-18%), enhancing the soil P availability. Compost + P increased labile and moderately labile P contents with a reduction of the acid phosphatase activity. The increase of soluble P (available-P) in the soil is an important gain because most P is fixed (unavailable) in tropical soils. The study revealed a great potential for optimizing by-products generated by the sugarcane industry with the enrichment of compost (adding phosphate rock and phosphate solubilizing bacteria), reducing the dependency of sugarcane production on finite P mineral reserves. (c) 2021 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 16/18944-3 - Mudanças climáticas e eficiência energética na agricultura: um enfoque em estresse hídrico, manejo orgânico e biologia do solo
• Beneficiário: Elke Jurandy Bran Nogueira Cardoso
• Modalidade de apoio: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Temático