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.] 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., no. Abstract No. 205-9..
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.
|EPrint Type:||Conference paper, poster, etc.|
|Type of presentation:||Paper|
|Subjects:|| Soil > Nutrient turnover|
Crop husbandry > Crop combinations and interactions
Crop husbandry > Production systems > Vegetables
|Research affiliation:|| Denmark > DARCOF III (2005-2010) > VEGQURE - Organic cropping Systems for Vegetable production|
Denmark > AU - Aarhus University > AU, DJF - Faculty of Agricultural Sciences
|Deposited By:||Kristensen, Ph.D. Hanne L.|
|Deposited On:||28 Nov 2007|
|Last Modified:||12 Apr 2010 07:35|
|Refereed:||Peer-reviewed and accepted|
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