Effect of Coated Urea with Humic-Calcium on Transformation of Nitrogen in Coastal Sandy Soil: A Soil Column Method

Abstract

Effect of Coated Urea with Humic-Calcium on Transformation of Nitrogen in Coastal Sandy Soil: A Soil Column Method (Sulakhudin, A Syukur, D Shiddieq and T Yuwono): In coastal sandy soil, mainly nitrogen losses due to leaching resulted to low fertilizer efficiency. Slow-release N fertilizers are proposed to minimize these losses, and humic-calcium coated urea has been examined. A soil column method was used to compare the effects of coated urea with humic-calcium on transformation and leaching loss of N in coastal sandy soil. The experiment aid to compare two kind source humic substances (cow manure and peat) which mixed with calcium as coated urea on transformation, vertical distribution and leaching N in coastal sandy soil. The concentration of humic-calcium coated urea i.e.1%, 5% and 10% based on their weight. The results showed that urea coated with humic-calcium from cow manure (UCHM) and humic-calcium from peat (UCHP) increased the N total and available N in the soil and decreased leaching loss of N from the soil column. Compare to UCHP, UCHM in all concentration showed N-nitrate higher than N-ammonium on incubation length 2, 4 and 6 weeks. The N leached from a costal sandy soil with application coated urea with UCHM ranged from 21.18% to 23.72% of the total N added as fertilizer, for coated urea with UCHP they ranged between 21.44% and 23.25%, whereas for urea (control) reach 29.48%. Leaching losses of mineral N were lower when urea coated with UCHM compared to urea coated with UCHP or urea fertilizer. The study concluded that the UCHM is better than UCHP in decreasing N leached from coastal sandy soil.

Mineral Nitrogen Release Patterns in Various Soil and Texture Types and the Impact of Urea and Coated Urea Potassium Humate on Barley Biomass

“…Interestingly, the application of coated urea potassium humate proved to be more efficacious in promoting the highest significant biomass yield, as compared to both the urea and control treatments in Arenosol. This finding indicates that the implementation of coated urea potassium humate has the potential to enhance fertilizer use efficiency while concurrently alleviating N loss [46]. This is primarily due to the reduction in the rate of urea hydrolysis and N fertilizer conversion in the soil [45,46,87].…”

“…This finding indicates that the implementation of coated urea potassium humate has the potential to enhance fertilizer use efficiency while concurrently alleviating N loss [46]. This is primarily due to the reduction in the rate of urea hydrolysis and N fertilizer conversion in the soil [45,46,87].…”

“…Moreover, the presence of humic acid can effectively impede the action of urease and thus decrease the rate of urea hydrolysis [45][46][47]. This phenomenon ultimately results in a diminished concentration of ammonium (NH 4 + -N) in the soil, which consequently mitigates the hazards of ammonia (NH 3 ) volatilization and potential nitrification, leading to a significant reduction in N losses [22,45].…”

A Review on Industrial by-products as Materials to Coat Compound Fertilizer

“…Usually, coating materials were chosen based on the ability to modify nutrient release characteristics of fertilizer and they can be organic or inorganic materials. However, some of coating materials have the ability to reduce nutrient release and provide other beneficial element for plant at the same time such as sulphur coated and humic-calcium coated fertilizers (Trenkel, 2010;Sulakhudin et. al., 2010).…”