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ACCESSION NO: 0418238 SUBFILE: CRIS

PROJ NO: 3625-21610-001-44S AGENCY: ARS 3625

PROJ TYPE: USDA COOPERATIVE AGREEMENT PROJ STATUS: NEW

START: 21 SEP 2009 TERM: 31 JAN 2010

INVESTIGATOR: HATFIELD J L; PARKIN T B; PRUEGER J H; KALTENHEUSER S

PERFORMING INSTITUTION:

STEVE KALTEHNEUSER

50690 270TH STREET

AMES, IOWA 50014

FIELD SCALE EVALUATION OF NITROGEN, CARBON, SOIL WATER, CROP GROWTH

INTERACTIONS

CLASSIFICATION

KA Subject Science Pct

102 0199 1060 60

205 2410 3010 40

CLASSIFICATION HEADINGS: R102 . Soil, Plant, Water, Nutrient Relationships; S0199 . Soil and

land, general; F1060 . Biology (whole systems); R205 . Plant Management Systems; S2410 .

Cross-commodity research--multiple crops; F3010 . Economics

BASIC 60% APPLIED 40% DEVELOPMENTAL 0%

OBJECTIVES: 1) Evaluate interactions among nitrogen, carbon, soil water, and crop growth

response across a range of soil types in a production field; and 2) Evaluate field scale decision

support system for nitrogen and crop management.

APPROACH: Field scale studies will be developed to evaluate nitrogen response to varying soil

water regimes across a production field and the carbon dynamics in response to nitrogen

management. Corn-soybean rotations will be evaluated over three growing seasons. Water, CO2,

nitrogen and light exchanges will be measured at several field locations within the field.

KEYWORDS: CROP MANAGEMENT AID PROFIT NITROGEN TOOLS RADIATION USE

REMOTE EFFICIENCY WATER DECISION SENSING

PROGRESS: 2010/10 TO 2011/09

Progress Report Objectives (from AD-416) 1) Evaluate interactions among nitrogen, carbon, soil

water, and crop growth response across a range of soil types in a production field; and 2) Evaluate

field scale decision support system for nitrogen and crop management. Approach (from AD-416)

Field scale studies will be developed to evaluate nitrogen response to varying soil water regimes

across a production field and the carbon dynamics in response to nitrogen management.

Corn-soybean rotations will be evaluated over three growing seasons. Water, CO2, nitrogen and

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light exchanges will be measured at several field locations within the field. This study focuses on

the exchanges of nitrogen, carbon, and water relative to crop growth patterns over a number of

years to quantify the interactions of nitrogen, carbon, and water in both corn and soybean

production systems. The approach to quantify the exchanges of energy (water), carbon

(photosynthesis), and nitrogen (crop growth) for both crops has been to link physiological and

energy balance measurements throughout the growing season. There is a linkage between carbon

and water exchanges that is not constant throughout the day and is mediated by the availability of

nitrogen in the crop plant. Patterns of carbon and water vapor exchange throughout the day reveal

where the plant is less efficient in the photosynthetic process and the degree of stress the plant is

undergoing throughout the season. These relationships are linked to surface temperature patterns

and to growth rates as determined by remote sensing methods. Seasonal patterns for both crops

have provided new insights into how plants respond to soil water conditions during the growing

season and have provided evidence of how crop growth efficiency can be enhanced through

management. There are weekly exchanges of information about the progress in the field

experiments during the summer growing season and monthly meetings to discuss the changes in

the field experiments during the winter period. Discussions are held via telephone or site visits.

PUBLICATIONS (not previously reported): 2010/10 TO 2011/09

No publications reported this period.

PROGRESS: 2009/10/01 TO 2010/09/30

Progress Report Objectives (from AD-416) 1) Evaluate interactions among nitrogen, carbon, soil

water, and crop growth response across a range of soil types in a production field; and 2) Evaluate

field scale decision support system for nitrogen and crop management. Approach (from AD-416)

Field scale studies will be developed to evaluate nitrogen response to varying soil water regimes

across a production field and the carbon dynamics in response to nitrogen management.

Corn-soybean rotations will be evaluated over three growing seasons. Water, CO2, nitrogen and

light exchanges will be measured at several field locations within the field. This agreement with a

local producer, supports the objectives of the parent project and focuses on the exchanges of

nitrogen, carbon, and water relative to crop growth patterns. Intensive studies have been

conducted over a number of years to quantify the interactions of nitrogen, carbon, and water in both

corn and soybean production systems. There have been continued refinements in the approach to

quantify the exchanges of energy (water), carbon (photosynthesis), and nitrogen (crop growth) for

both crops. There is a linkage between carbon and water exchanges that is not constant

throughout the day and is mediated by the availability of nitrogen in the crop plant. Patterns of

carbon and water vapor exchanged throughout the day reveal where the plant is less efficient in the

photosynthetic process and the degree of stress the plant is undergoing throughout the season.

These relationships are linked to surface temperature patterns and to growth rates as determined

by remote sensing methods. These seasonal patterns for both crops have provided new insights

into how plants respond to soil water conditions during the growing season and have provided

evidence of how crop growth efficiency can be enhanced through management. There are weekly

exchanges of information about the progress in the field experiments during the summer growing

season and monthly meetings to discuss the changes in the field experiments during the winter

period.

PUBLICATIONS: 2009/10/01 TO 2010/09/30

No publications reported this period.

SUPPLEMENTARY DATA: Institution Type: USDA Region: 3 Process Date:

2010/06/02 Progress Update: 2012/09/25

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