Year: 2021 | Month: June | Volume 8 | Issue 1

Nutrient Releasing Pattern of Humic Acid Coated Phosphatic Fertilizers

R.K. Kaleeswari


An experiment was conducted to standardize the humic acid coating for Mono ammonium Phosphate (MAP) and Single Super Phosphate (SSP). The levels of humic acid coating were 5, 10, 15 and 20 per cent. The design of the experiment was completely randomized design replicated thrice. The nutrient P release from the humic acid coated fertilizers was recorded at 6 hours intervals up to 72 hours. The Fourier transmission infrared spectroscopy characterization of MAP coated with 5% HA and MAP coated with 10% HA revealed the presence of functional groups such as alkenes, alcohols, aromatics, amine salts (primary and secondary) as well as halogens (free and coupled). The results revealed that a higher rate of P release was observed due to the application of MAP coated with 5 per cent and 10 per cent humic acid had a greater rate of P release whereas higher levels of humic acid coatings (15 per cent and 20 per cent) recorded a lesser rate of P release.

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