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Predicting phosphorus bioavailability from high-ash biochars

Wang, Tao LU ; Camps-Arbestain, Marta; Hedley, Mike and Bishop, Peter (2012) In Plant and Soil 357(1-2). p.173-187
Abstract
Biochars are highly variable in nutrient composition and availability, which are determined by types of feedstock and pyrolysis conditions. The aim of this research was to (a) study the bioavailability of phosphorus (P) in biochars using different feedstocks and pyrolysis conditions; (b) develop a robust chemical method for biochar P availability measurements.



In the present study, (a) chemical analysis - including total P and extractable P (2% citric acid, 2% formic acid, and neutral ammonium citrate extraction), and (b) a bioassay test using rye-grass grown in a P deficient sandy soil were used to compare the P bioavailability of different biochars. Biochars were produced from two different feedstocks (dairy... (More)
Biochars are highly variable in nutrient composition and availability, which are determined by types of feedstock and pyrolysis conditions. The aim of this research was to (a) study the bioavailability of phosphorus (P) in biochars using different feedstocks and pyrolysis conditions; (b) develop a robust chemical method for biochar P availability measurements.



In the present study, (a) chemical analysis - including total P and extractable P (2% citric acid, 2% formic acid, and neutral ammonium citrate extraction), and (b) a bioassay test using rye-grass grown in a P deficient sandy soil were used to compare the P bioavailability of different biochars. Biochars were produced from two different feedstocks (dairy manure-wood mixture, MAe; biosolid-wood mixture, BSe) at four different pyrolysis temperatures (250, 350, 450, and 550A degrees C).



Results showed that P in feedstock was fully recovered in the biochars. After 6 harvests, the biochars were as effective as the P fertilizers tested [Sechura phosphate rocks (SPR) and calcium dihydrogen phosphate (CaP)] in increasing the shoot yield. However, P uptake followed the order of CaP > MAe biochars > BSe biochars > SPR, on a same TP basis. Based on the Mitscherlich equation, 2% formic acid was the most sensitive indicator of P bioavailability in biochars.



The results suggest that high-ash biochars with high P concentrations are potential P sources with high-agronomic efficiency. We propose the use of 2% formic acid extraction to predict the availability of P in ash-rich biochars. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Plant and Soil
volume
357
issue
1-2
pages
173 - 187
publisher
Springer
external identifiers
  • scopus:84864151263
ISSN
0032-079X
DOI
10.1007/s11104-012-1131-9
language
English
LU publication?
yes
id
fe209111-909c-4f36-9aa1-5f25192b5134 (old id 8034273)
date added to LUP
2015-10-02 14:54:06
date last changed
2017-10-29 04:00:49
@article{fe209111-909c-4f36-9aa1-5f25192b5134,
  abstract     = {Biochars are highly variable in nutrient composition and availability, which are determined by types of feedstock and pyrolysis conditions. The aim of this research was to (a) study the bioavailability of phosphorus (P) in biochars using different feedstocks and pyrolysis conditions; (b) develop a robust chemical method for biochar P availability measurements. <br/><br>
<br/><br>
In the present study, (a) chemical analysis - including total P and extractable P (2% citric acid, 2% formic acid, and neutral ammonium citrate extraction), and (b) a bioassay test using rye-grass grown in a P deficient sandy soil were used to compare the P bioavailability of different biochars. Biochars were produced from two different feedstocks (dairy manure-wood mixture, MAe; biosolid-wood mixture, BSe) at four different pyrolysis temperatures (250, 350, 450, and 550A degrees C). <br/><br>
<br/><br>
Results showed that P in feedstock was fully recovered in the biochars. After 6 harvests, the biochars were as effective as the P fertilizers tested [Sechura phosphate rocks (SPR) and calcium dihydrogen phosphate (CaP)] in increasing the shoot yield. However, P uptake followed the order of CaP &gt; MAe biochars &gt; BSe biochars &gt; SPR, on a same TP basis. Based on the Mitscherlich equation, 2% formic acid was the most sensitive indicator of P bioavailability in biochars. <br/><br>
<br/><br>
The results suggest that high-ash biochars with high P concentrations are potential P sources with high-agronomic efficiency. We propose the use of 2% formic acid extraction to predict the availability of P in ash-rich biochars.},
  author       = {Wang, Tao and Camps-Arbestain, Marta and Hedley, Mike and Bishop, Peter},
  issn         = {0032-079X},
  language     = {eng},
  number       = {1-2},
  pages        = {173--187},
  publisher    = {Springer},
  series       = {Plant and Soil},
  title        = {Predicting phosphorus bioavailability from high-ash biochars},
  url          = {http://dx.doi.org/10.1007/s11104-012-1131-9},
  volume       = {357},
  year         = {2012},
}