Phosphate Sources and Filter Cake Amendment Affecting Sugarcane Yield and Soil Phosphorus Fractions

Abstract

Phosphate sources and filter cake amendment affecting sugarcane yield and soil phosphorus fractions. Rev Bras Cienc Solo. 2019;43:e0180227.

Improving phosphorus sustainability of sugarcane production in Brazil

“…Since the amounts of P extracted by resin plus 0.5 M NaHCO 3 are both considered plant available (Hedley, Stewart, & Chauhan, ; Tiessen & Moir, ), a fertilizer requirement prediction based on resin alone may overestimate the fertilizer P requirement. At the Macatuba field trial, labile P (16 mg/kg) was more than twice resin P (Soltangheisi et al, ), what was the case also for the other seven sites evaluated here (Figure b). At another sandy soil site in São Paulo state (Agudos), where the concentration of both resin P and inorganic labile P was <15 mg/kg, there was a significant ( p < .05) response in plant cane and first ratoon yield of 10.8 and 18.8 Mg/ha to P fertilizer (180 kg P/ha as TSP; Soltangheisi et al, ).…”

“…However, regional experience suggests that sugarcane is yielding well above average (>100 t/ha) on soils with <15 mg/kg resin‐P, for example, in the states of São Paulo and Goiás. This is supported by recent evidence from a replicated P response trial on a clayey oxisol (Macatuba) in São Paulo state where plant cane and first ratoon crops yielding >150 and >100 Mg/ha, respectively, did not show any yield response to P fertilizer (180 kg P/ha as TSP) even though resin P was only 7 mg/kg (Soltangheisi et al, ; Figure ).…”

“…At the Macatuba field trial, labile P (16 mg/kg) was more than twice resin P , what was the case also for the other seven sites evaluated here (Figure 3b). At another sandy soil site in São Paulo state (Agudos), where the concentration of both resin P and inorganic labile P was <15 mg/kg, there was a significant (p < .05) response in plant cane and first ratoon yield of 10.8 and 18.8 Mg/ha to P fertilizer (180 kg P/ha as TSP; Soltangheisi et al, 2019). We estimate a 16 Gg P immediate saving in P fertilizer inputs if national recommendation systems adopt inorganic labile P instead of resin P (see Methods).…”

“…As resin extracts only a small proportion of the total reserves of unused P that accumulate in Brazilian soils, this extractant maybe underestimating the amounts of soil labile P that sugarcane can exploit. Soltangheisi et al () observed that in sugarcane fields regularly fertilized with TSP, only 1.4% and 5.6% of total P were extracted by resin in clayey and sandy soils, respectively, while 6.0% and 18.0% were extracted by resin plus 0.5 M NaHCO 3 (inorganic labile P). Since the amounts of P extracted by resin plus 0.5 M NaHCO 3 are both considered plant available (Hedley, Stewart, & Chauhan, ; Tiessen & Moir, ), a fertilizer requirement prediction based on resin alone may overestimate the fertilizer P requirement.…”

Chemical and technological characteristics of sugarcane as a function of pelletized organomineral fertilizer with filter cake or sewage sludge sources

“…This fraction causes beneficial modifications that alter the dynamics of nutrient cycling in the soil-plant system [33]. Several studies also indicate organomineral fertilizers as viable substitutes for mineral fertilizers in many crops [8,[34][35][36][37][38]. Regarding the soil dynamics of C and N, long-term field report demonstrated reductions in soil stocks of these nutrients in deep soil layers after the applications of large quantities of synthetic mineral fertilizers, which did not occur when the fertilizer source was an organomineral [39].…”