11461: Roots below one meters depth are important for nitrate uptake by annual crops [Rødder under 1 meters dybde er vigtige for et-årige afgrøders optagelse af nitrat.]

Kristensen, Hanne L. and Thorup-Kristensen, Kristian (2006) Roots below one meters depth are important for nitrate uptake by annual crops [Rødder under 1 meters dybde er vigtige for et-årige afgrøders optagelse af nitrat.]. Paper presented at The American Society of Agronomy - Crop Science Society of America - Soil Science Society of America International Annual Meetings, Indianapolis, USA, November 12-16, 2006; Published in CD-rom "The American Society of Agronomy - Crop Science Society of America - Soil Science Society of America International Annual Meetings, November 12-16, 2006, Indianapolis, USA. No. 205-9. CD-rom "The American Society of Agronomy - Crop Science Society of America - Soil Science Society of America International Annual Meetings, November 12-16, 2006, Indianapolis, USA..^**

Summary

The root depths of annual crops vary from 0.2 m to more than 2 m depending on root growth rate and length of growing season. However, studies of root growth and N uptake are often restricted to a depth of 1 m or less, as root biomass is assumed to be negligible below this depth. We have studied the importance of root growth and N uptake to a depth of 2.5 m in fully grown field vegetables and cover crops by use of minirhizotrons and deep point placement of 15N. Deep rooted crucifereous crops were found to have high root densities to a depth of 1.5-2 m and high 15N uptake to this depth. The work shows that knowledge of the interactions between root growth and soil N below a depth of 1 m are important to understand crop N uptake and nitrate leaching from agro-ecosystems.

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