Phosphorus release dynamics under phosphate rock and ammonium sulphate in soil amendment

Year 2017, Volume: 6 Issue: 4, 312 - 318, 01.10.2017

Kofi Agyarko Kwame Agyei Frimpong Akwasi Adutwum Abunyewa

https://doi.org/10.18393/ejss.306535

Cited By: 2

Abstract

This study was undertaken to assess the release
pattern of available phosphorus in a Togo phosphate rock and ammonium sulphate
soil amendment. Treatments were prepared through the combinations of soil,
phosphate rock (PR) and ammonium sulphate (AS) fertilizer. The treatments were;
Control, 12.5g PR, 25g PR, 12.5g PR+1g AS, 12.5g PR+2g AS, 25.0g PR+1g AS and
25.0g PR+2g AS kg^-1 soil. Standard laboratory methods were used to
assess pH, available phosphorus (P) and total phosphorus (P). Generally, the pH
of treatments decreased to the lowest levels between the 4^th and 6^th
weeks after amendment. The AS fertilizer treatments had significantly (p≤0.05)
lower pH values than those without. Amendments with the 2gAS kg^-1
soil had significantly (p≤0.05) lower mean pH values than those with the 1gAS
kg^-1 soil. The AS fertilizer treatments also had significantly (p ≤
0.05) higher levels of the available P than those without. The higher the
amount of the AS in the amendment, the higher the level of the available P
concentration. Increase in the level of AS in the amendment also increased the
mean value of the available P released. The peaks of available P released were
observed between the 6^th and the 8^th weeks, after the
lowest pH values had been attained. Decreased soil pH relatively increased the
amount of phosphorus released (y = -12.47x + 111.4; R²=0.53).
Addition of PR in the treatments increased the total P levels. In conclusion,
combined application of AS and PR has the potential to increase soil P
availability, which is beneficial to crop farmers.

Keywords

Phosphate rock, ammonium sulphate, soil amendment, pH, available phosphorus, total phosphorus

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