Dissertation Research: Nitrogen Dynamics in a Legume-       Nonlegume Intercrop System
{'Code': '08010208', 'Directorate': {'Abbreviation': 'BIO', 'LongName': 'Direct For Biological Sciences'}, 'Division': {'Abbreviation': 'DEB', 'LongName': 'Division Of Environmental Biology'}}
{'SignBlockName': 'Althea Ball', 'PO_EMAI': 'aball@nsf.gov', 'PO_PHON': '7032920000'}
The overall goals of the proposed research are to quantify                 the contributions of different mechanisms by which nonlegumes                   yield more in intercrops with legumes than in monocultures and to               quantify how the contribution of each mechanism varies with                     interplant distance. The ultimate goal is to use this information               to design optimal intercrop systems.  Biomass and nitrogen yield                of a corn plant surrounded by legumes may be higher than that of                a corn plant surrounded by an equal density of corn plants either               because of reduced competition for soil nitrogen (greater                       availability of soil nitrogen to the corn) and/or the transfer of               atmospheric nitrogen fixed by the neighboring legume plants, i.e                facilitation.  These two sources can be distinquished by adding                 isotopic nitrogen to the soil.  Reduced competition would result                in an increase in the absolute quantity of labeled soil nitrogen                in the intercropped relative to monoculture corn.  Facilitation                 would result in a decrease in the proportion of labeled soil                    nitrogen in the intercropped corn (increase in proportion of                    atmospheric-derived N).
[{'FirstName': 'Margaret', 'LastName': 'Reeves', 'PI_MID_INIT': None, 'PI_SUFX_NAME': None, 'PI_FULL_NAME': 'Margaret Reeves', 'EmailAddress': None, 'NSF_ID': '000276295', 'StartDate': '03/15/1988', 'EndDate': None, 'RoleCode': 'Co-Principal Investigator'}, {'FirstName': 'Deborah', 'LastName': 'Goldberg', 'PI_MID_INIT': 'E', 'PI_SUFX_NAME': None, 'PI_FULL_NAME': 'Deborah E Goldberg', 'EmailAddress': 'degold@umich.edu', 'NSF_ID': '000176724', 'StartDate': '03/15/1988', 'EndDate': None, 'RoleCode': 'Principal Investigator'}]
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{'Code': '1128', 'Text': 'Population & Community Ecology'}
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