Phosphorus release dynamics under phosphate rock and ammonium sulphate in soil amendment
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 4th and 6th
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 6th and the 8th 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
References
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Details
Primary Language
English
Subjects
-
Journal Section
Research Article
Authors
Kofi Agyarko
This is me
College of Agriculture Education, University of Education, Winneba, Mampong Campus, Ghana
Ghana
Kwame Agyei Frimpong
This is me
Department of Soil Science, University of Cape Coast, Ghana
Ghana
Akwasi Adutwum Abunyewa
This is me
Department of Agroforestry, Kwame Nkrumah University of Science and Technology, Ghana
Ghana
Publication Date
October 1, 2017
Submission Date
January 5, 2017
Acceptance Date
April 7, 2017
Published in Issue
Year 2017 Volume: 6 Number: 4