Response of Sugarcane in a Red Ultisol to Phosphorus Rates, Phosphorus Sources, and Filter Cake

Figure 2

Available phosphorus (P resin) in the soil at 0.0–0.2 m, as a function of phosphorus source and filter cake (a), phosphorus application rate and filter cake (b and c) and depth 0.2–0.40 m, as a function of phosphorus application rate (d), and remaining phosphorus at 0.0–0.2 m, as a function of phosphorus application rate (e). Averages followed by single letters are significantly different (Tukey test, ). Capital letters compare P sources with the effect of filter cake. Lowercase letters compare the effect of filter cake on each source. : significant ().

(a)

(b)

(c)

(d)

(e)