Abstract
Sugar beet was grown within a crop rotation over two rotation cycles (2001, 2004) at ambient and elevated atmospheric CO2 concentration (375 and 550 ppm) with practical (126, 156 kg N ha-1) and low levels (63, 78 kg N ha-1) of nitrogen supply. In the second year another cultivar was used to prevent infestation by rhizomania, which occured on one half of the field plots at the end of the season of 2001. In 2004, shading was included as an additional treatment. The objectives were to investigate the growth response of sugar beet to elevated CO2 concentration at high and low nitrogen availability. Data set includes data on management, soil condition, weather, below and above ground growth (individual leaves, leaf area index, total biomass, beet yield and composition, water soluble carbohydrates, root biomass).
Highlights
The rising atmospheric CO2 concentration [CO2] is known to increase photosynthesis and growth and to decrease stomatal conductance and transpiration of C3 crops (Ainsworth and Long, 2005)
The objective of the present study was to investigate the effect of rising atmospheric CO2 concentrations at different nitrogen supply on growth, yield and sugar content of sugar beet
In Europe existing studies on high [CO2] effects on C3 crops were mainly based on chamber studies, which suffer from several limitations, which may prevent realistic estimates of the CO2 effect
Summary
The rising atmospheric CO2 concentration [CO2] is known to increase photosynthesis and growth and to decrease stomatal conductance and transpiration of C3 crops (Ainsworth and Long, 2005). A FACE experiment was carried out in Braunschweig, Germany, to investigate the effects of elevated [CO2] on a crop rotation at a high N level according to farmerspractice and at a low N level. Sugar beet was studied on the FACE field site in Braunschweig, Germany, in two years (2001, 2004) at ambient (371, 377 ppm) and elevated CO2 (550, 549 ppm). Plants grown under FACE showed an acceleration of canopy senescence starting in August 2001. To test whether this is related to sink limitation of growth as previously found in a chamber experiment (Demmers-Derks et al, 1998) a shading treatment was included in the 2nd year. Findings have been published in various Journals and have already been used by crop modelers (see papers listed in the REFERENCES)
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