Valorization of calcium phosphite waste as phosphorus fertilizer: Effects on green manure productivity and soil properties

ROS and Oxidative Response Systems in Plants Under Biotic and Abiotic Stresses: Revisiting the Crucial Role of Phosphite Triggered Plants Defense Response

“…After 8 weeks of planting, the soil biomass yield, Phi concentration in plant biomass, various soil P pools, and microbial biomass nutrients were measured. In addition, with the exception of lupin in the control ( Lupinus albus L.), Phi has no negative effect on green manure performance ( Fontana et al, 2021 ). The Phi concentration in plant biomass varies with species and soil types.…”

“…In sand, after adding Phi, the amount of P (P NCHO 3 ) much increased in TSP treatment, indicating that Phi is partially oxidized. Among clays with high P stabilization ability, Phi P NaHCO 3 , which is higher than TSP, may promote the chemical P form due to different solubility ( Fontana et al, 2021 ). The Phi-treated roots of avocado obtained protection from zoospores of P. cinnamomi , Phi enhanced the root resistance to pathogen invasion ( van der Merwe et al, 1992 ).…”

Review of Phosphite as a Plant Nutrient and Fungicide

“…Since abiotic Phi oxidation is very slow, microbial oxidation dominates Phi oxidation [11,47]. After Phi addition, soil microorganisms must adapt to the elevated soil Phi where oxidation to Pi would likely occur from two weeks to four months depending on soil environmental conditions [48,49]. Therefore, additional studies designed to quantify Phi oxidation kinetics in soil may guide management decision for Phi use as a soil applied P source.…”

“…Fortunately, the residual Phi/Pi response was evaluated where subsequent soybean (Glycine max L.) yield was greater in Phi and Pi treated soil compared to untreated soil; likely residual applied Phi oxidized to Pi. More recently, Fontana [48] conducted greenhouse studies to compare Ca-Phi (industrial waste) with Ca-Pi (triple superphosphate) applied to several agronomic crops and found no differences in biomass yield, microbial biomass P, and NaHCO 3 extractable P. The lack of response to Pi or Phi was due to sufficient soil test P levels. An increase in NaHCO 3 -P with applied Phi suggests microbial oxidation of Phi to Pi occurred resulting in a residual value to soil applied Phi reported by MacIntire [1].…”

“…Unfortunately, few studies quantify residual availability of soil applied Phi. With soil applied Phi, soil microorganisms must adapt to increased soil Phi requiring two weeks to four months for oxidation of Phi to Pi depending on soil environmental conditions [48,49]. Thus, it is important to evaluate plant response to soil applied Phi following sufficient time for Phi oxidation.…”