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Site‐Specific Management Zones Based on Soil Electrical Conductivity in a Semiarid Cropping System
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| Zeitschriftentitel: | Agronomy Journal |
|---|---|
| Personen und Körperschaften: | , , , , |
| In: | Agronomy Journal, 95, 2003, 2, S. 303-315 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
Wiley
|
| Schlagwörter: |
| author_facet |
Johnson, Cinthia K. Mortensen, David A. Wienhold, Brian J. Shanahan, John F. Doran, John W. Johnson, Cinthia K. Mortensen, David A. Wienhold, Brian J. Shanahan, John F. Doran, John W. |
|---|---|
| author |
Johnson, Cinthia K. Mortensen, David A. Wienhold, Brian J. Shanahan, John F. Doran, John W. |
| spellingShingle |
Johnson, Cinthia K. Mortensen, David A. Wienhold, Brian J. Shanahan, John F. Doran, John W. Agronomy Journal Site‐Specific Management Zones Based on Soil Electrical Conductivity in a Semiarid Cropping System Agronomy and Crop Science |
| author_sort |
johnson, cinthia k. |
| spelling |
Johnson, Cinthia K. Mortensen, David A. Wienhold, Brian J. Shanahan, John F. Doran, John W. 0002-1962 1435-0645 Wiley Agronomy and Crop Science http://dx.doi.org/10.2134/agronj2003.3030 <jats:p>Site‐specific management (SSM) can potentially improve both economic and ecological outcomes in agriculture. Effective SSM requires strong and temporally consistent relationships among identified management zones; underlying soil physical, chemical, and biological parameters; and crop yields. In the central Great Plains, a 250‐ha dryland experiment was mapped for apparent electrical conductivity (EC<jats:sub>a</jats:sub>). Eight fields were individually partitioned into four management zones based on equal ranges of deep (EC<jats:sub>DP</jats:sub>) and shallow (EC<jats:sub>SH</jats:sub>) EC<jats:sub>a</jats:sub> (approximately 0–30 and 0–90 cm depths, respectively). Previous experiments documented negative correlations between EC<jats:sub>SH</jats:sub> and soil properties indicative of productivity. The objectives of this study were to examine EC<jats:sub>SH</jats:sub> and EC<jats:sub>DP</jats:sub> relationships with 2 yr of winter wheat (<jats:italic>Triticum aestivum</jats:italic> L.) and corn (<jats:italic>Zea mays</jats:italic> L.) yields and to consider the potential applications of EC<jats:sub>a</jats:sub>–based management zones for SSM in a semiarid cropping system. Within‐zone wheat yield means were negatively correlated with EC<jats:sub>SH</jats:sub> (<jats:italic>r</jats:italic> = −0.97 to −0.99) and positively correlated with EC<jats:sub>DP</jats:sub> (<jats:italic>r</jats:italic> = 0.79–0.97). Within‐zone corn yield means showed no consistent relationship with EC<jats:sub>SH</jats:sub> but positive correlation with EC<jats:sub>DP</jats:sub> (<jats:italic>r</jats:italic> = 0.81–0.97). Equal‐range and unsupervised classification methods were compared for EC<jats:sub>SH</jats:sub>; within‐zone yield variances declined slightly (0–5%) with the unsupervised approach. Yield response curves relating maximum wheat yields and EC<jats:sub>SH</jats:sub> revealed a boundary line of maximum yield that decreased with increasing EC<jats:sub>SH</jats:sub>. In this semiarid system, EC<jats:sub>SH</jats:sub>–based management zones can be used in SSM of wheat for: (i) soil sampling to assess residual nutrients and soil attributes affecting herbicide efficacy, (ii) yield goal determination, and (iii) prescription maps for metering inputs.</jats:p> Site‐Specific Management Zones Based on Soil Electrical Conductivity in a Semiarid Cropping System Agronomy Journal |
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| title |
Site‐Specific Management Zones Based on Soil Electrical Conductivity in a Semiarid Cropping System |
| title_unstemmed |
Site‐Specific Management Zones Based on Soil Electrical Conductivity in a Semiarid Cropping System |
| title_full |
Site‐Specific Management Zones Based on Soil Electrical Conductivity in a Semiarid Cropping System |
| title_fullStr |
Site‐Specific Management Zones Based on Soil Electrical Conductivity in a Semiarid Cropping System |
| title_full_unstemmed |
Site‐Specific Management Zones Based on Soil Electrical Conductivity in a Semiarid Cropping System |
| title_short |
Site‐Specific Management Zones Based on Soil Electrical Conductivity in a Semiarid Cropping System |
| title_sort |
site‐specific management zones based on soil electrical conductivity in a semiarid cropping system |
| topic |
Agronomy and Crop Science |
| url |
http://dx.doi.org/10.2134/agronj2003.3030 |
| publishDate |
2003 |
| physical |
303-315 |
| description |
<jats:p>Site‐specific management (SSM) can potentially improve both economic and ecological outcomes in agriculture. Effective SSM requires strong and temporally consistent relationships among identified management zones; underlying soil physical, chemical, and biological parameters; and crop yields. In the central Great Plains, a 250‐ha dryland experiment was mapped for apparent electrical conductivity (EC<jats:sub>a</jats:sub>). Eight fields were individually partitioned into four management zones based on equal ranges of deep (EC<jats:sub>DP</jats:sub>) and shallow (EC<jats:sub>SH</jats:sub>) EC<jats:sub>a</jats:sub> (approximately 0–30 and 0–90 cm depths, respectively). Previous experiments documented negative correlations between EC<jats:sub>SH</jats:sub> and soil properties indicative of productivity. The objectives of this study were to examine EC<jats:sub>SH</jats:sub> and EC<jats:sub>DP</jats:sub> relationships with 2 yr of winter wheat (<jats:italic>Triticum aestivum</jats:italic> L.) and corn (<jats:italic>Zea mays</jats:italic> L.) yields and to consider the potential applications of EC<jats:sub>a</jats:sub>–based management zones for SSM in a semiarid cropping system. Within‐zone wheat yield means were negatively correlated with EC<jats:sub>SH</jats:sub> (<jats:italic>r</jats:italic> = −0.97 to −0.99) and positively correlated with EC<jats:sub>DP</jats:sub> (<jats:italic>r</jats:italic> = 0.79–0.97). Within‐zone corn yield means showed no consistent relationship with EC<jats:sub>SH</jats:sub> but positive correlation with EC<jats:sub>DP</jats:sub> (<jats:italic>r</jats:italic> = 0.81–0.97). Equal‐range and unsupervised classification methods were compared for EC<jats:sub>SH</jats:sub>; within‐zone yield variances declined slightly (0–5%) with the unsupervised approach. Yield response curves relating maximum wheat yields and EC<jats:sub>SH</jats:sub> revealed a boundary line of maximum yield that decreased with increasing EC<jats:sub>SH</jats:sub>. In this semiarid system, EC<jats:sub>SH</jats:sub>–based management zones can be used in SSM of wheat for: (i) soil sampling to assess residual nutrients and soil attributes affecting herbicide efficacy, (ii) yield goal determination, and (iii) prescription maps for metering inputs.</jats:p> |
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| author | Johnson, Cinthia K., Mortensen, David A., Wienhold, Brian J., Shanahan, John F., Doran, John W. |
| author_facet | Johnson, Cinthia K., Mortensen, David A., Wienhold, Brian J., Shanahan, John F., Doran, John W., Johnson, Cinthia K., Mortensen, David A., Wienhold, Brian J., Shanahan, John F., Doran, John W. |
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| description | <jats:p>Site‐specific management (SSM) can potentially improve both economic and ecological outcomes in agriculture. Effective SSM requires strong and temporally consistent relationships among identified management zones; underlying soil physical, chemical, and biological parameters; and crop yields. In the central Great Plains, a 250‐ha dryland experiment was mapped for apparent electrical conductivity (EC<jats:sub>a</jats:sub>). Eight fields were individually partitioned into four management zones based on equal ranges of deep (EC<jats:sub>DP</jats:sub>) and shallow (EC<jats:sub>SH</jats:sub>) EC<jats:sub>a</jats:sub> (approximately 0–30 and 0–90 cm depths, respectively). Previous experiments documented negative correlations between EC<jats:sub>SH</jats:sub> and soil properties indicative of productivity. The objectives of this study were to examine EC<jats:sub>SH</jats:sub> and EC<jats:sub>DP</jats:sub> relationships with 2 yr of winter wheat (<jats:italic>Triticum aestivum</jats:italic> L.) and corn (<jats:italic>Zea mays</jats:italic> L.) yields and to consider the potential applications of EC<jats:sub>a</jats:sub>–based management zones for SSM in a semiarid cropping system. Within‐zone wheat yield means were negatively correlated with EC<jats:sub>SH</jats:sub> (<jats:italic>r</jats:italic> = −0.97 to −0.99) and positively correlated with EC<jats:sub>DP</jats:sub> (<jats:italic>r</jats:italic> = 0.79–0.97). Within‐zone corn yield means showed no consistent relationship with EC<jats:sub>SH</jats:sub> but positive correlation with EC<jats:sub>DP</jats:sub> (<jats:italic>r</jats:italic> = 0.81–0.97). Equal‐range and unsupervised classification methods were compared for EC<jats:sub>SH</jats:sub>; within‐zone yield variances declined slightly (0–5%) with the unsupervised approach. Yield response curves relating maximum wheat yields and EC<jats:sub>SH</jats:sub> revealed a boundary line of maximum yield that decreased with increasing EC<jats:sub>SH</jats:sub>. In this semiarid system, EC<jats:sub>SH</jats:sub>–based management zones can be used in SSM of wheat for: (i) soil sampling to assess residual nutrients and soil attributes affecting herbicide efficacy, (ii) yield goal determination, and (iii) prescription maps for metering inputs.</jats:p> |
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| spelling | Johnson, Cinthia K. Mortensen, David A. Wienhold, Brian J. Shanahan, John F. Doran, John W. 0002-1962 1435-0645 Wiley Agronomy and Crop Science http://dx.doi.org/10.2134/agronj2003.3030 <jats:p>Site‐specific management (SSM) can potentially improve both economic and ecological outcomes in agriculture. Effective SSM requires strong and temporally consistent relationships among identified management zones; underlying soil physical, chemical, and biological parameters; and crop yields. In the central Great Plains, a 250‐ha dryland experiment was mapped for apparent electrical conductivity (EC<jats:sub>a</jats:sub>). Eight fields were individually partitioned into four management zones based on equal ranges of deep (EC<jats:sub>DP</jats:sub>) and shallow (EC<jats:sub>SH</jats:sub>) EC<jats:sub>a</jats:sub> (approximately 0–30 and 0–90 cm depths, respectively). Previous experiments documented negative correlations between EC<jats:sub>SH</jats:sub> and soil properties indicative of productivity. The objectives of this study were to examine EC<jats:sub>SH</jats:sub> and EC<jats:sub>DP</jats:sub> relationships with 2 yr of winter wheat (<jats:italic>Triticum aestivum</jats:italic> L.) and corn (<jats:italic>Zea mays</jats:italic> L.) yields and to consider the potential applications of EC<jats:sub>a</jats:sub>–based management zones for SSM in a semiarid cropping system. Within‐zone wheat yield means were negatively correlated with EC<jats:sub>SH</jats:sub> (<jats:italic>r</jats:italic> = −0.97 to −0.99) and positively correlated with EC<jats:sub>DP</jats:sub> (<jats:italic>r</jats:italic> = 0.79–0.97). Within‐zone corn yield means showed no consistent relationship with EC<jats:sub>SH</jats:sub> but positive correlation with EC<jats:sub>DP</jats:sub> (<jats:italic>r</jats:italic> = 0.81–0.97). Equal‐range and unsupervised classification methods were compared for EC<jats:sub>SH</jats:sub>; within‐zone yield variances declined slightly (0–5%) with the unsupervised approach. Yield response curves relating maximum wheat yields and EC<jats:sub>SH</jats:sub> revealed a boundary line of maximum yield that decreased with increasing EC<jats:sub>SH</jats:sub>. In this semiarid system, EC<jats:sub>SH</jats:sub>–based management zones can be used in SSM of wheat for: (i) soil sampling to assess residual nutrients and soil attributes affecting herbicide efficacy, (ii) yield goal determination, and (iii) prescription maps for metering inputs.</jats:p> Site‐Specific Management Zones Based on Soil Electrical Conductivity in a Semiarid Cropping System Agronomy Journal |
| spellingShingle | Johnson, Cinthia K., Mortensen, David A., Wienhold, Brian J., Shanahan, John F., Doran, John W., Agronomy Journal, Site‐Specific Management Zones Based on Soil Electrical Conductivity in a Semiarid Cropping System, Agronomy and Crop Science |
| title | Site‐Specific Management Zones Based on Soil Electrical Conductivity in a Semiarid Cropping System |
| title_full | Site‐Specific Management Zones Based on Soil Electrical Conductivity in a Semiarid Cropping System |
| title_fullStr | Site‐Specific Management Zones Based on Soil Electrical Conductivity in a Semiarid Cropping System |
| title_full_unstemmed | Site‐Specific Management Zones Based on Soil Electrical Conductivity in a Semiarid Cropping System |
| title_short | Site‐Specific Management Zones Based on Soil Electrical Conductivity in a Semiarid Cropping System |
| title_sort | site‐specific management zones based on soil electrical conductivity in a semiarid cropping system |
| title_unstemmed | Site‐Specific Management Zones Based on Soil Electrical Conductivity in a Semiarid Cropping System |
| topic | Agronomy and Crop Science |
| url | http://dx.doi.org/10.2134/agronj2003.3030 |