Volatilization and leaching losses of nitrogen from different coated urea fertilizers

Abstract

Fertilizers are one of the costly inputs in agriculture and development of nutrient efficient fertilizers is need of the hour. Keeping in view of the above, slow release coated urea fertilizers are developed and the N loss from different coated urea fertilizers in a Vertisol was studied in comparison with normal urea. The coated fertilizers used were neem, 4% pine oleoresin (POR), 35% nano-rock phosphate and 2% nano-ZnO coated urea. In later two cases nanoparticles were loaded over 4% POR coated urea during preparation. Application of coated urea fertilizers such as neem coated urea and pine oleoresin coated urea in a Vertisol reduced the ammonia volatilization by 27.5% and 41.1%, respectively. Similarly, reduction of NO 3-N leaching due to application of neem, resin, nano-rock phosphate and nano-ZnO coated urea were 18.3%, 28.0%, 25.7% and 35.1%, respectively. The reduction of N volatilization and leaching losses imparted by coated urea fertilizers could be a viable N source for crops. However field level validation experiments have to be carried out to assess the efficacy of these coated fertilizers in enhancing crop yield and nutrient use efficiency.

Nitrogen Availability and Physiological Response of Corn After 12 Years with Organic and Mineral Fertilization

“…Low ammonium concentration in the soil solution was caused by the rapid nitrification of NH 4 + , which was likely due to adequate soil moisture, and pH of the soil solution was higher than 5.5 (Table 1), in addition to the losses caused by NH 3 volatilization (Lourenzi et al 2011;Wang et al 2017;Jadon et al 2018). It is likely that the predominantly aerobic initial soil conditions did not provide significant losses of NO 3…”

Reducing Nitrate Leaching through the Soil Profile using some Nano-Sized Organic Residues

“…The content of NO3-N was leached from soil columns during the experiment was very low after distilled water addition directly (0 time). Moreover, the nitrate leaching was high in the primary stages of the experiment after application of urea uncoated and coated by organic residues at different sizes (Jadon et al, 2018). The highest nitrate leaching rate was observed after 3 days incubation period, with values 2357.…”

Safeguarding human and planetary health demands a fertilizer sector transformation

“…An example of the need for IFAT is the formulation of urea-N with micronutrients, which can reduce N transformation via ammonia volatilization and nitrous oxide emission by 20%-35% (Khariri, Yusop, Musa, & Hussin, 2016). Comparable results are reported for coating with neem, nanorock phosphate, and nano-ZnO (Jadon et al, 2018). Reduced N losses as ammonia and/or nitrous/nitric oxide enhances crop uptake of N, which under a variety of production systems, including drought and low NPK inputs, have been recorded at between 8% and 53% (Dimkpa, Bindraban, et al, 2017;Dimkpa, Singh, Bindraban, Adisa, et al, 2019;Dimkpa, White, Elmer, & Gardea-Torresdey, 2017b).…”

“…The mechanism underlying micronutrients' influence on N uptake is related to their potential for modulating microbial ammonification or nitrification rates via influencing urease, dehydrogenase, and nitrification enzyme activities (Chaperon & Sauvé, 2007). Such an outcome could permit significant reduction in N application rates (Das et al, 2018;Dimkpa, White, et al, 2017b;Jadon et al, 2018).…”