Leaf, canopy and agronomic water-use efficiency of field-grown sugar beet in response to potassium fertilization
| Autor: | Klaus Dittert, M. Hauer-Jakli, Mehmet Senbayram, F. Böttcher, J. Meyer zur Müdehorst, Bálint Jákli |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
0106 biological sciences
Potassium chemistry.chemical_element Plant Science 01 natural sciences Human fertilization Water-use efficiency Leaf area index Water content Mathematics 2. Zero hunger biology fungi food and beverages 04 agricultural and veterinary sciences 15. Life on land biology.organism_classification Agronomy chemistry Soil water 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Sugar beet Agronomy and Crop Science Water use 010606 plant biology & botany |
| Zdroj: | Journal of Agronomy and Crop Science. 204:99-110 |
| ISSN: | 0931-2250 |
| Popis: | Potassium (K) fertilization is important to maintain adequate concentrations of plant available K in agricultural soils to achieve best yields and improve crop stress tolerance and water-use efficiency (WUE). Water-use efficiency (WUE) can be expressed on various spatiotemporal scales, and it is known that responses of WUE to external stress are not uniform across scales. Multiscale evaluations of the impact of varying K fertilization on the WUE of C3 crops under field conditions are missing so far. In the present field study, we evaluated effects of K fertilization on WUE of sugar beet (Beta vulgaris L.) on short-termed leaf- (WUELeaf) and canopy-scales (WUECanopy) and as the agronomic ratio of white sugar yield (WSY) to in-season water use (i.e. WUEWSY). In K-fertilized plots, WUEWSY was enhanced by 15.9%. This effect is attributed to increased beet yield and WSY, as no differences in total in-season water use between fertilized and unfertilized plots were observed. Potassium (K) fertilization significantly enhanced the leaf area index, resulting in a more efficient depletion of soil moisture by roots in K-fertilized plots. As a consequence, WUELeaf was increased due to stomatal adjustment. Potassium (K) improved WUECanopy only by tendency. It is concluded that K fertilization improves the WUE of field-grown sugar beet across scales, but processes that regulate WUE are highly scale dependent. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Plný text