Polymer-coated urea (PCU) was developed to better synchronize nitrogen (N) supply with crop needs and reduce N losses. The objective of this work evaluate the effects different rates prepared using combinations ESN on corn (Zea mays L.), grain yield, yield components, in-season nutritional status, residual soil N. Field experiments were conducted two sites in eastern Ontario (Canada); Kemptvill...

The degradative pathway of cyanuric acid [1,3,5-triazine-2,4,6(1H,3H,5H)-trione] was examined in Pseudomonas sp. strain D. The bacterium grew with cyanuric acid, biuret, urea or NH4+ as sole source of nitrogen, and each substrate was entirely metabolized concomitantly with growth. Enzymes from strain D were separated by chromatography on DEAE-cellulose and three reactions were examined. Cyanuri...

Cultures of Escherichia coli B and K-12 produce urea during growth in minimal medium. Results of isotopic labeling experiments were consistent with the sole source of urea being from the conversion of arginine to putrescine. Since E. coli itself has no demonstrable urease activity, the rate of urea production is a measure of the flux through the arginine to putrescine pathway.

Two feeding trials evaluated several byproducts from commercial amino acid fermentations as N supplements for lactating cows. Trial 1 was a replicated 5 x 5 Latin square that used 2-wk periods and 25 Holstein cows (five with ruminal cannulae) fed diets containing [dry matter (DM) basis] 28% alfalfa silage, 31% corn silage, 28% high moisture ear corn plus 4 percentage units of crude protein (CP)...

Urea fertilizer as a nitrogen source is used widely and globally. However, N loss through ammonia volatilization from applied urea has become major drawback to agriculture. A pot experiment was conducted determine the effect of rice straw biochar on (1) total N, soil exchangeable NH4+, available NO3− (2) uptake P, K in plants. The treatments evaluated were: (S: Soil only, U: + 175 kg ha−1 urea,...

The ATP:urea amido-lyase reaction of yeast has been shown. to consist of two distinct activities, an avidin-sensitive, thiourea-insensitive urea carboxylase and an avidin-insensitive, thiourea-sensitive allophanate hydrolase. Mutants lacking each of these activities have been isolated and were found to complement each other. Enzyme preparations and assay procedures were similar to those describ...

this study was performed to assess the effects of nitrogen fertilizer and vermicompost on qualitative and quantitative yield of chamomile ( matricaria chamomilla l.). it was conducted at the research fields of ran company located in firouzkouh, iran, in 2013. treatments were consisted of 1) control, 2) 100% nitrogen from urea, 3) 100% nitrogen from ammonium nitrate, 4) 75% nitrogen from urea an...