%0 Journal Article
%T Effects of Enriched Biochars on the Availability and Fractions of Phosphorus in the Saline Soils of Lake Urmia Basin
%J Iranian Journal of Soil and Water Research
%I University of Tehran
%Z 2008-479X
%A Mousavi, Roghayeh
%A Rasouli-Sadaghiani, MirHassan
%A Sepehr, Ebrahim
%A Barin, Mohsen
%A Khezri, Maryam
%D 2021
%\ 02/19/2021
%V 51
%N 12
%P 3177-3193
%! Effects of Enriched Biochars on the Availability and Fractions of Phosphorus in the Saline Soils of Lake Urmia Basin
%K Inorganic phosphorus fractions
%K phosphorus availability
%K saline soils
%K Biochar
%K enriched-biochar
%R 10.22059/ijswr.2020.294590.668438
%X In order to reduce the problems of biochar application in calcareous soils, by changing the surface properties of apple-grape biochar by phosphoric and chloric acids, the effects of enriched biochars on the fraction of phosphorus (P) forms in saline soils of Lake Urmia was investigated as a factorial incubation experiment in a completely randomized design with two factors: fertilizer treatments (control (Cont), biochar (BC), phosphate fertilizer (TSP), Biochar-Rock phosphate (BC-RP) and enriched-biochar (EB) types (BC-HCl-RP and BC-H3PO4-RP)) and 2 calcareous soils with different EC (2 and 15 dSm-1). Olsen-P, pH and different forms of inorganic P were determined by sequential extraction method at 7, 30 and 60 days of incubation. The results showed that on average, the BC-HCl-RP and BC-H3PO4-RP treatments reduced the pH of S1and S2 soils, 0.5 and 1 unit, respectively. BC-H3PO4-RP and BC-HCl-RP treatments increased Olsen-P of S1 soil from 6.7 to 57.5 and 55.5 mgkg-1 and soil S2 from 7.4 mgkg-1 to 71.3 and 62 mgkg-1, respectively. Enriched biochars significantly (p <0.01) altered the distribution and amount of inorganic P forms. Thus, BC-H3PO4-RP and BC-HCl-RP treatments increased the amount of Ca2-P fraction in the S1 soil by 2.9 and 2.6 times and in the S2 soils by 1.06 and 0.97 times, respectively. However, the amounts of Ca8-P, Al –P and Ca10-P fractions reduced significantly. Olsen-P positively and significantly correlated with Ca2-P, Fe-P, and Ca10-P fractions and positively but not significantly with the Al-P fraction, suggesting that in the extraction of Olsen-P, phosphorus is released from these mineral fractions. In general, EBs application may cause P to remain in the plant-available forms over the time. Therefore, it can help to improve P nutrition, reduce salinity stress, and eliminate the common problems of biochar application in these soils.
%U https://ijswr.ut.ac.ir/article_78580_18f41d2d23fef148743c0acc858c8630.pdf