Premium
Nitrate and Ammonium Uptake Kinetics of Three Annual Range Species
Author(s) -
Dempsey P. M.,
Shock C. C.,
Williams W. A.,
Carlson R. M.
Publication year - 1988
Publication title -
journal of agronomy and crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.095
H-Index - 74
eISSN - 1439-037X
pISSN - 0931-2250
DOI - 10.1111/j.1439-037x.1988.tb00671.x
Subject(s) - trifolium subterraneum , ammonium , bromus , nitrate , agronomy , nitrogen , chemistry , biology , botany , ecology , poaceae , pasture , organic chemistry
The uptake kinetics of nitrate and ammonium ions was compared for the annual range species: subclover ( Trifolium subterraneum L.), soft chess ( Bromus mollis L.), and broadleaved filaree ( Erodium botrys [Cav.] Bertol.) to study competitive interactions in nitrogen deficient soils. Fifteen‐day‐old seedlings were allowed to deplete solutions of nitrate or ammonium in the range of 5 to 500 μM concentrations for a 10‐hour period during which net uptake (depletion) was monitored by a sensitive conductance technique. Subclover uptake rates were markedly less than those for soft chess and filaree for both nitrate and ammonium at both low and high concentrations. The evidence supports the hypothesis that subclover is a poor competitor for soil N in part because of this physiological difference.