Assessment of the Effect of Glycine, Oxalic Acid and Nitrogen-Phosphorus-Potassium (NPK) Fertilizer as Nutrient Supplement Using Phosphate and Oxalic Acid as Indices
This study evaluated the release profiles of phosphate and oxalic acid in soils treated with oxalic
acid a low molecular weight organic acid and glycine an amino acid compared with NPK fertilizer
monitored over a period of 21 days. The soil treated with oxalic acid and glycine released higher
phosphate and oxalic acid than that treated with NPK fertilizer. The soil treated with oxalic acid
released higher phosphate than that which was treated with glycine while higher oxalic acid was
observed in the soil treated with glycine rather than for that treated with oxalic acid. Significant
effects were observed between the treatment and the length of time for phosphate release (P<0.05)
while for the release of oxalic acid, there was no significant effect between the treatment (P>0.05)
but with increase in length of time (P<0.05). This demonstrates the efficient ability of oxalic acid
and glycine as substitutes for phosphate fertilizers.
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