Apart from N2, ammonia* is the most widespread nitrogenous compound on earth. It is a
preferred nitrogen source for many prokaryotes, fungi and plants, and the end product of …

Supply and behaviour of NH4 and NO3 in the soil and processes of release, mechanisms of
N uptake in plants, factors affecting NH4 and NO3 uptake, general features of N nutrition and …

summary Potential advantages of ammonium relative to nitrate assimilation (assuming equal
nitrogen supply in the two forms), deduced from known biochemical pathways and the site of …

Influxes of 13NH4+ across the root plasmalemma were measured in intact seedlings of
Picea glauca (Moench) Voss. Two kinetically distinct uptake systems for NH4+ were …

Among the mineral nutrient elements, nitrogen (N) most often limits the growth and yield of
nonleguminous crop plants, which require relatively large quantities of N (from 1.5 to 5% of …

Nitrogen is absorbed by plants primarily in the form of NHt-and NO;-ions. Organic N-
compounds, subsequently produced by assimilation, finally reach the soil as dead plant …

The inducibility and kinetics of the NO3−, NO2−, and NH4+ transporters in roots of wheat
seedlings (Triticum aestivum cv Yercora Rojo) were characterized using precise methods …

Abstract Imsande, J. 1986. Inhibition of nodule development in soybean by nitrate or
reduced nitrogen.—J. exp. Bot. 37: 348–355. Nodulation of hydroponically grown soybean …

The concentration and composition of bioavailable nitrogen (N) and phosphorus (P) in the
upper ocean shape eukaryotic phytoplankton communities and influence their physiological …

The kinetic parameters K m and V max for the uptake of NO3-and NH4+ were determined in
wheat plants grown in nutrient solutions containing NO3-, NH4+ or NO3-+ NH4+, with 1 …