The pH of dystrophic Entisol soil fertilized with 0 and 65 m3 ha−1 cassava waste water “in natura” and planted with lettuce rose from 5.08 to 7.72, respectively [25]. However, when studying the effect of the cassava waste water on chemical, physical, and microbiological characteristics of a typical Hapludox in the coastal plains of the Recoˆncavo da Bahia, Brazil, the application of cassava waste water did not alter the pH of the soil [9]. There was an increase in pH of “Oxic Tropudalf ” resulting from the application of cassava waste water to the top soil (0–10 cm), which decreased with increasing soil depth (11–20 cm) and time (5 days). After 10 days of application of the waste water, the soil pH increased again with increasing soil depth [4].