Phosphorus desorption kinetics in two calcareous soils amended with P fertilizer and organic matter

Abstract

We studied the effects of poultry manure and pistachio compost with and without phosphorus fertilizer on the kinetics of phosphorus desorption in two calcareous soils of Kerman and Koohbanan farms in the southeastern of Iran. For this purpose mono potassium phosphate, at rates of 0, and 100 parts per million of phosphorus, and airdried manure, at rates of 0 and 4% were mixed with the soils. The soils were incubated at 24-25°C and near field capacity for 90 days in the greenhouse. Afterwards, the desorption of P was studied by the successive extraction with 0.5 M NaHCO 3 . The results of this research indicated that application of OM and fertilizer P combined increased P recovery in each of the extraction time, adding poultry manure and 100 mg phosphorus together to the soils, increased P desorption more than pistachio compost in the soils. The phosphorus desorption rate was initially rapid and then became slower until equilibrium was approached. Kinetic data were best described by power function and simple Elovich equations. Subsequent to these equations, parabolic diffusion equation was also well fitted the timedependent P desorption data.

Spatial and seasonal distributions of soil phosphorus in a short-term flooding wetland of the Yellow River Estuary, China

“…Furthermore, the degradation and decomposition of plant residues by soil microbial communities also contribute a lot to the profile pattern of soil AP . Although soil P contents in some literatures were reported to associated with SOM (Camargo et al, 2013;Fekri et al, 2011;Vincent et al, 2010), no significant correlation was observed between them in this study.…”

Phosphorus Release from Dairy Manure, the Manure-Derived Biochar, and Their Amended Soil: Effects of Phosphorus Nature and Soil Property

“…This result is in agreement with the study by Song and Guo (2012), which indicated that conversion of poultry litter into biochar through slow pyrolysis at 350°C decreased the amount of water‐soluble P by more than 65%. Second, P in the manure was released quickly in the first 48 h and rapidly approached equilibrium within 72 h, while in the biochar, although quick within the first 48 h, P release remained stable and did not reach equilibrium even at 240 h. The initially fast P release within the first 48 h for both manure and biochar was probably attributed to ion exchange or desorption process (McDowell et al, 2001), and/or dissolution of some poorly crystalline or amorphous phosphates (Toor and Bahl, 1999; Fekri et al, 2011). Phosphorus release reached equilibrium after 72 h in manure, indicating a possible sorption–desorption controlled process, which was confirmed by the kinetic modeling.…”

Removal of Phosphorus from Water Using Marble Dust as Sorbent Material

“…Furthermore, the pseudo second order is based on the assumption that sorption follows a second order mechanism, with chemisorption as the rate limiting step. So the rate of occupation of sorption sites is proportional to the square of the number of unoccupied Sites [14,15]. A comparison of the experimental phosphorus sorption with the profiles of pseudo first order and second order models for different initial concentrations shown in Figures 5 and 6, the data generated using the values of q e , k 1 , and k 2 obtained from kinetic studies, clearly showed that the experimental data followed pseudo second order model at all initial concentrations.…”