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Deep roots of Brassica oleracea have high uptake of 15N-nitrate to 2 meters soil depth

Kristensen, H.L. and Thorup-Kristensen, K. (2006) Deep roots of Brassica oleracea have high uptake of 15N-nitrate to 2 meters soil depth. [Submitted]

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Summary

• Deep roots may be important for uptake of NO3- by annual crops. A field experiment with the deep rooted crop curly kale (Brassica oleracea L. convar. acephala (DC.) Alef. var. sabellica L.) was performed to investigate root distribution and N uptake in deep soil layers.
• Root distribution was investigated by use of minirhizotrons and root extractions to 2.4 m depth. The capacity for crop N uptake was studied by deep 15NO3- placement followed by analysis of plant 15N content after 3-30 days.
• The atom percent 15N excess (APE) of plant samples was of similar size after uptake of 15N placed at depths in the range of 0.4-2 m. Root colonisation and start of 15N uptake were synchronized in 2.4 m depth.
• The deep roots had higher inflow of 15N compared to the more shallow roots. Root depth was more important for the ability for NO3- uptake than root abundance. Thus deep roots can be important for N uptake and for reduction of NO3-¬ leaching from annual cropping systems.


EPrint Type:Journal paper
Keywords:Brassica oleracea, curly kale, rooting depth, nitrate uptake, root distribution, root density, minirhizotrons
Subjects: Soil > Nutrient turnover
Soil > Soil quality > Soil biology
Farming Systems > Farm nutrient management
Environmental aspects > Air and water emissions
Research affiliation: Denmark > AU - Aarhus University > AU, DJF - Faculty of Agricultural Sciences
Denmark > DARCOF II (2000-2005) > I.10 (VegCatch) Organic vegetable cultivation methods and use of catch crops
Denmark > Other organizations
Deposited By: Kristensen, Ph.D. Hanne L.
ID Code:7918
Deposited On:04 Apr 2006
Last Modified:12 Apr 2010 07:33
Document Language:English
Status:Submitted
Refereed:Submitted for peer-review but not yet accepted

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