The impact of sugarcane filter cake on the availability of P in the rhizosphere and associated microbial community structure

Abstract

This study aimed to evaluate the interaction between filter cake (FC), and phosphorus fertilizers with differing solubility on the growth and P nutrition of sugarcane.Effects of soil amendment with FC on different soil P fractions and influence on microbial community structure in the rhizosphere were also assessed. Two glasshouse experiments were conducted with completely randomized block designs. The first experiment evaluated rates of FC using a factorial design (5 × 2): 0, 2.5, 5, 10 and 15 g FC kg −1 soil applied as either broadcast in bulk soil or in the planting furrow. The second experiment used a factorial design (2 × 3): without and with FC (5 g kg −1 soil, dry basis), both without P (NP) and with P supplied as either triple superphosphate (TSP) or as rock phosphate (RP), both at the rate of 78.4 mg kg −1 based on total P. Microbial community structure was determined using TRFLP and dynamics of soil P by Hedley fractionation. Filter cake applied at increasing rates in the absence of P was effective in increasing shoot growth and P uptake by plant, particularly when applied to bulk soil as compared to furrow application. Also, FC improved P uptake and increased the availability of labile inorganic P in the rhizosphere and modified the structure of fungal and bacterial communities, whereas only bacterial and archaea communities were influenced by P fertilizer use. Filter cake was more effective when combined with RP, with increased growth and P utilization and thus can be considered as a feasible and practical option for farmer use in substitution to TSP, a more expensive source. K E Y W O R D S microbial changes, P fractionation, rock phosphate, Saccharum spp., soil amendments, soluble phosphate How to cite this article: Arruda B, Rodrigues M, Gumiere T, et al. The impact of sugarcane filter cake on the availability of P in the rhizosphere and associated microbial community structure. Soil Use Manage.

Inoculation with Plant Growth-Promoting Bacteria to Reduce Phosphate Fertilization Requirement and Enhance Technological Quality and Yield of Sugarcane

“…Previous studies performed under controlled conditions already demonstrated the potential of PGPBs to improve sugarcane yields [53]. Also, the positive effect of PGPBs on plant biomass and nutrition has been observed in soils with low P availability [48].…”

Sustainable soil use and management: An interdisciplinary and systematic approach

“…Among other factors, soil microbial communities are affected by the availability of nutrients corresponding to the type of soil management practice (Bolan et al, 1996;Lauber et al, 2009;Leff et al, 2015). For example, the use of soluble fertilizers (e.g., monocalcium phosphate), less soluble organic fertilizer (e.g., sugarcane filter cake) or nearly insoluble rock phosphate (Arruda et al, 2019) have different impacts on soil microbial communities. Soil management practices also affect soil hydraulics, which affects plant and microbial biodiversity and ecosystem resilience (Alley et al, 2002;Anderegg et al, 2018).…”

Improving phosphorus sustainability of sugarcane production in Brazil

“…Phosphorus in FC is mostly organic and must be mineralized over two or three seasons to supply P for plant uptake, but research suggests that FC can be partially or fully substituted for inorganic P fertilizer at planting without confounding crop yields or the build‐up rates of soil P fertility (Caione et al, ; Elsayed, Babiker, Abdelmalik, Mukhtar, & Montange, ). Additional benefits in conserving soil moisture and microbial diversity have also been observed; for example, Arruda et al () found that FC modified the structure of fungal and bacterial communities, whereas only bacterial and archaea communities were influenced by mineral P fertilizer use. Realizing effective substitution is dependent on the cost of transporting FC to surrounding farmland, and recycling distances from the mills are currently 20–30 km.…”