Phosphorus availability from magnesium-modified P-enriched Douglas fir biochar as a controlled release fertilizer
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Date
2021-08-04
Journal Title
Journal ISSN
Volume Title
Publisher
Soil Use and Management
Abstract
Phosphorus (P) is one of the essential elements required for plant growth and de velopment. However, worldwide, many agricultural soils can be deficient in P.
The use of fertilizers and manures as a source of P can be costly, limited in sup ply in some regions of the world and ecologically unfavourable. Nutrient-enriched
biochar has been suggested as a relatively cost-effective and eco-friendly P source.
This study investigated P availability from Douglas fir biochar modified with mag nesium chloride and potassium hydroxide solutions only (B), and modified P enriched Douglas fir biochar B50, B100 and B150 corresponding to B treated with
50, 100 and 150 mg P L−1 solutions of potassium phosphate monobasic. Triple
super phosphate fertilizer (FC) and a control treatment without phosphate added
(C) used as a reference treatment. Treatments were added to soil in varied amounts
to obtain the same P rate of 30 kg P ha−1. Aboveground biomass dry weight yield
(R2
= .7) and plant height (R2
= .86) improved with P contents. After harvest, re sidual soil P for the FC treatment was significantly greater than all other treatments
(p-value = 1.7848 E-6, R2
= .8). Plant height and aboveground dry weight biomass
were greater with B150 compared to B50 at the same total P loading, suggesting
that the greater P concentration of the biochar (B150) resulted in less tightly bound
P and was therefore more available for plant uptake. This study showed promise of
utilizing P-enriched Douglas fir biochar as a slow-release P fertilizer.
Description
Arwenyo_Phosphorus_availability_article_2023
Keywords
nutrient management, P availability, P-enriched Douglas fir biochar, soil amendment, sustainability
Citation
Arwenyo, B., Varco, J. J., Dygert, A., & Mlsna, T. (2022). Phosphorus availability from magnesium‐modified P‐enriched Douglas fir biochar as a controlled release fertilizer. Soil Use and Management, 38(1), 691-702.