Topic
Urea
About: Urea is a research topic. Over the lifetime, 21394 publications have been published within this topic receiving 382444 citations. The topic is also known as: carbamide & carbonic acid diamide.
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TL;DR: In this paper, the authors compare N 2 O emissions resulting from application of commercially available enhanced-efftciency N fertilizers with emissions from conventional dry granular urea in irrigated cropping systems.
Abstract: Nitrogen fertilization is essential for optimizing crop yields; however, it increases N 2 O emissions. The study objective was to compare N 2 O emissions resulting from application of commercially available enhanced-efftciency N fertilizers with emissions from conventional dry granular urea in irrigated cropping systems. Nitrous oxide emissions were monitored from corn (Zea mays L.) based rotations receiving fertilizer rates of 246 kg N ha -1 when in corn, 56 kg N ha -1 when in dry bean (Phaseolus vulgaris L.), and 157 kg N ha -1 when in barley (Hordeum vulgare L. ssp. vulgare). Cropping systems included conventional-till continuous corn (CT-CC), no-till continuous corn (NT-CC), no-till corn-dry bean (NT-CDb), and no-till corn-barley (NT-CB). In the NT-CC and CT-CC systems, a controlled-release, polymer-coated urea (ESN) and dry granular urea were compared. In the NT-CDb and NT-CB rotations, a stabilized urea source (SuperU) was compared with urea. Nitrous oxide fluxes were measured during two growing seasons using static, vented chambers and a gas chromatograph analyzer. Cumulative growing season N 2 O emissions from urea and ESN application were not different under CT-CC, but ESN reduced N 2 O emissions 49% compared with urea under NT-CC. Compared with urea, SuperU reduced N 2 O emissions by 27% in dry bean and 54% in corn in the NT-CDb rotation and by 19% in barley and 51% in corn in the NT-CB rotation. This work shows that the use of no-till and enhanced-efficiency N fertilizers can potentially reduce N 2 O emissions from irrigated systems.
126 citations
TL;DR: The herbicide-binding protein displayed an anomalous electrophoretic migration behavior in SDS-polyacrylamide gel electrophoresis in the presence or absence of urea; its apparent molecular weight decreased when the urea concentration increased.
126 citations
126 citations
TL;DR: The nitrogen excretion was studied in the one-humped camel, Camelus dromedarius, and found that when a growing camel was maintained on a low N intake (dates and hay), the amount of N excreted in the form of urea, ...
Abstract: The nitrogen excretion was studied in the one-humped camel, Camelus dromedarius. When a growing camel was maintained on a low N intake (dates and hay) the amount of N excreted in the form of urea, ...
126 citations
TL;DR: This study suggested that N in the Bio-MUC was shown slow releasing in water but maize growth promoting in soil, relative to conventional urea, and biochar from agro-wastes could be used for blending urea as combined organo/mineral urea to replace mineral urea so to reduce N use and impacts on global Nr.
125 citations