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Biological P cycling is influenced by the form of P fertilizer in an Oxisol

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Title Biological P cycling is influenced by the form of P fertilizer in an Oxisol
 
Creator Margenot, Andrew J.
Sommer, Rolf
Mukalama, John
Parikh, Sanjai J.
 
Subject phosphorus
phosphatase
oxisol
soil
soil properties
soil fertility
fósforo
ferralsoles
microbiology
 
Description Phosphate rock (PR) is an alternative fertilizer to increase the P content of P-deficient weathered soils. We evaluated the effects of fertilizer form on indicators of biological cycling of P using an on-farm trial on a Rhodic Kandiudox in western Kenya. Treatment plots were sampled after 13 cropping seasons of P applications as Minjingu phosphate rock (PR) or as triple super phosphate (TSP) (50 kg P ha−1 season−1), as well as a P-unfertilized control (0 kg P ha−1 season−1). Soils (0–15 and 15–30 cm) were analyzed for microbial biomass P (Pmic), activities of acid phosphomonoesterase, alkaline phosphomonoesterase, and phosphodiesterase, and sequentially extractable P fractions. P additions as Minjingu PR yielded 299% greater Pmic than TSP at 0–15-cm depth despite similar labile P concentrations in the two P fertilization treatments and stimulated activities of acid phosphomonoesterase (+39%). When added in the soluble form of TSP, a greater percentage of total soil P was present in mineral-bound forms (+33% Fe- and Al-associated P). Higher soil pH under Minjingu PR (pH 5.35) versus TSP (pH 5.02) and the P-unfertilized treatment (pH 4.69) at 0–15-cm depth reflected a liming effect of Minjingu PR. The form of P fertilizer can influence biological P cycling in weathered soils, potentially improving P availability under Minjingu PR relative to TSP via enhanced microbial biomass P and enzymatic drivers of P cycling.
 
Date 2017-11
2017-08-16T16:03:35Z
2017-08-16T16:03:35Z
 
Type Journal Article
 
Identifier Margenot, Andrew J.; Sommer, Rolf; Mukalama, John; Parikh, Sanjai J.. 2017. Biological P cycling is influenced by the form of P fertilizer in an Oxisol . Biology and Fertility of Soils 53(8): 899-909.
0178-2762
https://hdl.handle.net/10568/83158
https://doi.org/10.1007/s00374-017-1226-9
 
Language en
 
Rights CC-BY-4.0
Open Access
 
Format p. 899-909
 
Publisher Springer Science and Business Media LLC
 
Source Biology and Fertility of Soils