Chlorophyll meter- and leaf color chart-based nitrogen management for rice and wheat in northwestern India
Overapplication of N in cereal crops leads to low N recovery efficiency and risk of NO3 pollution of ground water. The chlorophyll meter, also known as SPAD meter, is a simple, portable diagnostic tool for identifying crop N status. We used it to test need‐based N management approaches for rice (Ory...
| Main Authors: | , , , , , , |
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| Format: | Journal Article |
| Language: | Inglés |
| Published: |
Wiley
2002
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10568/166955 |
| _version_ | 1855543503887532032 |
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| author | Singh, Bijay Singh, Yadvinder Ladha, Jagdish K. Bronson, Kevin F. Balasubramanian, Vethaiya Singh, Jagdeep Khind, Charan S. |
| author_browse | Balasubramanian, Vethaiya Bronson, Kevin F. Khind, Charan S. Ladha, Jagdish K. Singh, Bijay Singh, Jagdeep Singh, Yadvinder |
| author_facet | Singh, Bijay Singh, Yadvinder Ladha, Jagdish K. Bronson, Kevin F. Balasubramanian, Vethaiya Singh, Jagdeep Khind, Charan S. |
| author_sort | Singh, Bijay |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | Overapplication of N in cereal crops leads to low N recovery efficiency and risk of NO3 pollution of ground water. The chlorophyll meter, also known as SPAD meter, is a simple, portable diagnostic tool for identifying crop N status. We used it to test need‐based N management approaches for rice (Oryza sativa L.) and wheat (Triticum aestivum L.) on a loamy sand in northwestern India. Applying 30 kg N ha−1 each time the SPAD value fell below the critical value of 37.5 resulted in application of 90 kg N ha−1, which produced rice yields equivalent to those with 120 kg N ha−1 applied in three splits. Using a SPAD value of 35 was inadequate for the two rice cultivars because it resulted in application of only 60 kg N ha−1 and, thus, low yields. With high inherent soil fertility resulting in rice yield of >3 Mg ha−1 in zero‐N plots, applying N basally or a week after rice transplanting did not further increase yield. Limited experimentation with leaf color chart (LCC) indicated that N management based on LCC shade 4 helped avoid overapplication of N to rice. Wheat responded to N application at maximum tillering (MT) when SPAD value fell below 44. Wheat yield increased by 20% when 30 kg N ha−1 was applied at SPAD value of 42 at MT. Results show that plant need–based N management through chlorophyll meter reduces N requirement of rice from 12.5 to 25%, with no loss in yield. |
| format | Journal Article |
| id | CGSpace166955 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 2002 |
| publishDateRange | 2002 |
| publishDateSort | 2002 |
| publisher | Wiley |
| publisherStr | Wiley |
| record_format | dspace |
| spelling | CGSpace1669552025-02-19T14:27:12Z Chlorophyll meter- and leaf color chart-based nitrogen management for rice and wheat in northwestern India Singh, Bijay Singh, Yadvinder Ladha, Jagdish K. Bronson, Kevin F. Balasubramanian, Vethaiya Singh, Jagdeep Khind, Charan S. chlorophyll meters spad meter leaves colour charts nitrogen fertilizers india Overapplication of N in cereal crops leads to low N recovery efficiency and risk of NO3 pollution of ground water. The chlorophyll meter, also known as SPAD meter, is a simple, portable diagnostic tool for identifying crop N status. We used it to test need‐based N management approaches for rice (Oryza sativa L.) and wheat (Triticum aestivum L.) on a loamy sand in northwestern India. Applying 30 kg N ha−1 each time the SPAD value fell below the critical value of 37.5 resulted in application of 90 kg N ha−1, which produced rice yields equivalent to those with 120 kg N ha−1 applied in three splits. Using a SPAD value of 35 was inadequate for the two rice cultivars because it resulted in application of only 60 kg N ha−1 and, thus, low yields. With high inherent soil fertility resulting in rice yield of >3 Mg ha−1 in zero‐N plots, applying N basally or a week after rice transplanting did not further increase yield. Limited experimentation with leaf color chart (LCC) indicated that N management based on LCC shade 4 helped avoid overapplication of N to rice. Wheat responded to N application at maximum tillering (MT) when SPAD value fell below 44. Wheat yield increased by 20% when 30 kg N ha−1 was applied at SPAD value of 42 at MT. Results show that plant need–based N management through chlorophyll meter reduces N requirement of rice from 12.5 to 25%, with no loss in yield. 2002-07 2024-12-19T12:56:50Z 2024-12-19T12:56:50Z Journal Article https://hdl.handle.net/10568/166955 en Wiley Singh, Bijay; Singh, Yadvinder; Ladha, Jagdish K.; Bronson, Kevin F.; Balasubramanian, Vethaiya; Singh, Jagdeep and Khind, Charan S. 2002. Chlorophyll meter- and leaf color chart-based nitrogen management for rice and wheat in northwestern India. Agronomy Journal, Volume 94 no. 4 p. 821-829 |
| spellingShingle | chlorophyll meters spad meter leaves colour charts nitrogen fertilizers india Singh, Bijay Singh, Yadvinder Ladha, Jagdish K. Bronson, Kevin F. Balasubramanian, Vethaiya Singh, Jagdeep Khind, Charan S. Chlorophyll meter- and leaf color chart-based nitrogen management for rice and wheat in northwestern India |
| title | Chlorophyll meter- and leaf color chart-based nitrogen management for rice and wheat in northwestern India |
| title_full | Chlorophyll meter- and leaf color chart-based nitrogen management for rice and wheat in northwestern India |
| title_fullStr | Chlorophyll meter- and leaf color chart-based nitrogen management for rice and wheat in northwestern India |
| title_full_unstemmed | Chlorophyll meter- and leaf color chart-based nitrogen management for rice and wheat in northwestern India |
| title_short | Chlorophyll meter- and leaf color chart-based nitrogen management for rice and wheat in northwestern India |
| title_sort | chlorophyll meter and leaf color chart based nitrogen management for rice and wheat in northwestern india |
| topic | chlorophyll meters spad meter leaves colour charts nitrogen fertilizers india |
| url | https://hdl.handle.net/10568/166955 |
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