Publication Details |
Category | Text Publication |
Reference Category | Journals |
DOI | 10.1007/s11104-014-2275-6 |
Document | Shareable Link |
Title (Primary) | Impact of potassium on plant uptake of non-exchangeable NH4+-N |
Author | Beuters, P.; Scherer, H.W.; Spott, O.; Vetterlein, D. |
Source Titel | Plant and Soil |
Year | 2015 |
Department | BOPHY |
Volume | 387 |
Issue | 1-2 |
Page From | 37 |
Page To | 47 |
Language | englisch |
UFZ wide themes | RU1 |
Abstract | Aims and backgroundRelease of ‘non-exchangeable’ NH4 +-N from interlayers of 2:1 clay minerals is postulated to depend not only on soil solution NH4 +-N concentration but also on the concentration of K+ and Ca2+. Concentrations of all three cations are altered in rhizosphere compared to soil solution at larger distance from the root surface. MethodsNon-exchangeable NH4 +-N pool was labelled with 15 N. Treatments including application of K+, Ca2+ and K+ + Ca2+ were established. In a compartment system approach we analysed changes in soil solution concentrations of 15NH4 +-N, 15NO3 −-N, K+ and Ca2+ in situ at different distances from the root surface over time and related them to the release of non-exchangeable 15NH4 +-N and uptake of 15 N by plants. Results and conclusionsThe 15 N enrichment in plant tissue was significantly lower in treatments with K+ application compared to those without. This was in line with smaller depletion of non-exchangeable 15NH4 +-N in the rhizosphere for these treatments and also with lower 15 N abundance in soil solution NO3 −-N fraction. Hence, K+ application hampered the release of NH4 + from the interlayers. A promoting effect of increasing Ca2+ concentrations on release of non-exchangeable NH4 +-N could not be evaluated since the Ca2+ concentration in soil solution was largely controlled by small amounts of carbonate contained in the substrate and thus the addition of Ca2+ did not result in a relevant increase of soil solution Ca2+ concentration as originally intended. The use of 15 N to follow the fate of non-exchangeable NH4 +-N proved very useful as it provides a higher sensitivity for all measured fractions compared to total N. However, as soil N fractions equilibrate with each other labelling one fraction exclusively is not possible. |
Persistent UFZ Identifier | https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=15343 |
Beuters, P., Scherer, H.W., Spott, O., Vetterlein, D. (2015): Impact of potassium on plant uptake of non-exchangeable NH4+-N Plant Soil 387 (1-2), 37 - 47 10.1007/s11104-014-2275-6 |