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Developing Sap Nitrate Tests for Wheat and Barley, Maricopa, 1998

dc.contributor.authorRiley, E. A.
dc.contributor.authorThompson, T. L.
dc.contributor.authorWhite, S. A.
dc.contributor.authorOttman, M. J.
dc.contributor.editorOttman, Michael J.en_US
dc.date.accessioned2012-02-01T19:47:13Z
dc.date.available2012-02-01T19:47:13Z
dc.date.issued1998-10
dc.identifier.urihttp://hdl.handle.net/10150/208252
dc.description.abstractThe standard procedure for determining nitrogen (N) status in small grains is to sample lower stem tissue for nitrate (NO₃) analysis. The tissues are then submitted to a laboratory for analysis. Sap nitrate (NO₃) can be analyzed in the field, immediately after collecting the sample, using a Cardy meter. Guidelines for sap analysis have not yet been determined. The objectives of this study were to: (i) correlate NO₃-N in dried stem tissue with sap NO₃-N, and (ii) develop sap NO₃ test guidelines for N management in durum and feed barley. In November 1997 one variety of durum (Kronos) and one variety of feed barley (Gustoe) were planted at the Maricopa Agricultural Center. Three N rates (80, 200, and 400 lbs N/acre) were applied in four split applications. Each treatment was replicated five times in a randomized complete block design. Samples were collected from lower stems at the 3-4 leaf 2 node, flag leaf visible, and heading growth stages. Grain yields ranged from 5185 lbs/A to 7156 lbs/A for Kronos and 6314 lbs/A to 7517 lbs/A for Gustoe. Maximum yields were achieved at 200 lbs N/A for both varieties. Correlation coefficients between stem NO₃-N and sap NO₃-N were 0.79 for Kronos and 0.84 for Gustoe. Sap NO₃-N analysis can be used to determine N status during the season for both Kronos and Gustoe.
dc.language.isoen_USen_US
dc.publisherCollege of Agriculture, University of Arizona (Tucson, AZ)en_US
dc.relation.ispartofseriesAZ1059en_US
dc.relation.ispartofseriesSeries P-114en_US
dc.subjectAgriculture -- Arizonaen_US
dc.subjectGrain -- Arizonaen_US
dc.subjectForage plants -- Arizonaen_US
dc.subjectBarley -- Arizonaen_US
dc.subjectWheat -- Arizonaen_US
dc.subjectBarley -- Fertilizer managementen_US
dc.subjectWheat -- Fertilizer managementen_US
dc.titleDeveloping Sap Nitrate Tests for Wheat and Barley, Maricopa, 1998en_US
dc.typetexten_US
dc.typeArticleen_US
dc.identifier.journalForage and Grain: A College of Agriculture Reporten_US
refterms.dateFOA2018-08-26T00:35:00Z
html.description.abstractThe standard procedure for determining nitrogen (N) status in small grains is to sample lower stem tissue for nitrate (NO₃) analysis. The tissues are then submitted to a laboratory for analysis. Sap nitrate (NO₃) can be analyzed in the field, immediately after collecting the sample, using a Cardy meter. Guidelines for sap analysis have not yet been determined. The objectives of this study were to: (i) correlate NO₃-N in dried stem tissue with sap NO₃-N, and (ii) develop sap NO₃ test guidelines for N management in durum and feed barley. In November 1997 one variety of durum (Kronos) and one variety of feed barley (Gustoe) were planted at the Maricopa Agricultural Center. Three N rates (80, 200, and 400 lbs N/acre) were applied in four split applications. Each treatment was replicated five times in a randomized complete block design. Samples were collected from lower stems at the 3-4 leaf 2 node, flag leaf visible, and heading growth stages. Grain yields ranged from 5185 lbs/A to 7156 lbs/A for Kronos and 6314 lbs/A to 7517 lbs/A for Gustoe. Maximum yields were achieved at 200 lbs N/A for both varieties. Correlation coefficients between stem NO₃-N and sap NO₃-N were 0.79 for Kronos and 0.84 for Gustoe. Sap NO₃-N analysis can be used to determine N status during the season for both Kronos and Gustoe.


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