Home⇛Annals of Tropical Research⇛vol. 41 no. 2 (2019)

Fate Of Phosphorus Fertilizer In Acidic Cambisol Assessed Using 33P Isotope Labeling Technique

Deejay Maranguit | Yakov Kuzyakov

 

Abstract:

Direct P labeling approach is a very powerful technique that has high 33 sensitivity in tracing the fate of added phosphorus (P) fertilizers across various P pools. Nonetheless, only a few studies have used this approach. This study traced the fate of applied P fertilizer in acidic P-limited soil using the P labeling approach. 33 The incorporation of P-labeled KH PO in available P (P ), microbial biomass P 33 2 4 AEM (P ) and Fe/Al-bound P (P ) pools was followed in Cambisol as influenced by C mic NaOH and N sources applied as glucose and ammonium sulfate, respectively. Results showed that not all of the added P fertilizer remains in available pool; instead, it was distributed to poorly-available pools. Fast, almost instantaneous P fixation by the Fe and Al oxides and immobilization by microbial uptake were recorded. Applying glucose boosts microbial growth and demand for P, resulting in increased P 33 recovery. High P recovery in P (20% of the applied P) and in P (45% of applied 33 33 mic NaOH 33P) showed the dominance of P immobilization by microorganisms and adsorption by Fe and Al oxides on the fate of P in an acidic soil. Nevertheless, these can contribute to long-term P availability after the turnover of microbial biomass and desorption of fixed P.



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