Abstract
Reduction of Ammonia Loss by Mixing Urea with Liquid Humic and Fulvic Acids Isolated from Tropical Peat Soil
Highlights
Ammonia (NH3) loss from volatilization processes reduces urea-N fertilizer use efficiency[1,2]
Extraction time of 4.5 h using a mechanical shaker at 188 rpm, acidification with 6 N HCl, fractionation under room temperature for 2 h and centrifugation time of 15 min were adopted for preparation of liquid humic acid (LHA) and Liquid Fulvic Acid (LFA)
Treatments evaluated in this study were; T0-soil alone, T1-urea, T2-urea, T3-LHA+Urea, T4-LFA+urea, T5-LHA+LFA+urea, T6LHA+LFA+urea and (T7) ammonium sulphate
Summary
Ammonia (NH3) loss from volatilization processes reduces urea-N fertilizer use efficiency[1,2]. The main concerns for the above mixtures are that they create an acidic environment from acidic materials used and inhibit ureolytic microorganisms’ activities which in effect slows down the release of NH4+ into the soil and indirectly reduces N loss[12]. In this regard, a new or better fertilizer formulation needs to be developed from organic based materials, which have the capability to retain NH4+ (due to high CEC) as well as maintaining low soil pH. The objectives of this laboratory study were to evaluate the effectiveness of liquid humic and fulvic acids, isolated from tropical peat soils, in reducing N loss from urea fertilizer as well as to investigate the ability of these acids to retain NH4+ and NO3 ̄ .or reduce soil pH
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