Organic and inorganic forms of phosphorus in soils amended with sugar cane filter cake

• Published in: Soil use and management Vol. 37; no. 3; pp. 449 - 459
• Main Authors: Braos, Lucas Boscov, Bettiol, Aline Carla Trombeta, Di Santo, Ludmilla Geraldo, Ferreira, Manoel Evaristo, Cruz, Mara Cristina Pessôa, Nicholson, Fiona
• Format: Journal Article
• Language: English
• Published: Bedfordshire Wiley Subscription Services, Inc 01.07.2021
• Subjects: administrative management; Availability; available P; clay; Clay minerals; Dry matter; dry matter accumulation; Fertilizers; Filter cake; fine-textured soils; Hapludox; Hapludults; Iron; loamy sand soils; NMR spectroscopy; Nutrition; Organic carbon; organic fertilizer; Organic phosphorus; Phosphorus; phosphorus cycling; phosphorus fertilizers; phosphorus fractions; Saccharides; Soil; Soil texture; Soil treatment; Soils; Sugar; Sugarcane; Texture; triple superphosphate; Uptake
• ISSN: 0266-0032; 1475-2743
• DOI: 10.1111/sum.12597

Studies of phosphorus (P) behaviour in soils receiving sugar cane filter cake are important for determining doses, its contribution to P nutrition and maximizing fertilizer efficiency, especially in soils with low P availability. This study aimed to assess organic and inorganic forms of P in soils treated with sugar cane filter cake, and the relationship between these and plant available P. Soil inorganic (Pi) and organic (Po) phosphorus forms, organic carbon, pH and resin P were measured in two soils; a Typic Hapludox with clay texture and an Arenic Hapludult with loamy sand texture, subject to three fertilizer treatments (nil P control and 100 mg P dm−3 as filter cake and triple superphosphate). Inorganic P was fractionated to soluble/loosely bound, Al‐bound, Fe‐bound, occluded and Ca‐bound P forms. Organic P was fractionated into labile, fulvic, humic and residual Po forms. Plant dry matter yield and P uptake were also determined. Both fertilizers increased the Al‐ and Fe‐bound P fractions, with the increases caused by triple superphosphate 14.7 and 7.2 mg kg−1 higher than filter cake, respectively. Filter cake increased the fulvic Po by 40.9 mg kg−1, while triple superphosphate increased it by 28.5 mg kg−1, in the fine‐textured soil. Al‐, Fe‐bound and labile Po fractions in both soils had significant correlations (p <. 01) with plant absorbed P (r = .75, .84 and .54, respectively). Filter cake resulted in lower Pi fractions and availability, and it has potential to partially replace mineral P fertilizer in fine‐textured soils and, entirely, in coarse‐textured soils.