Nondestructive estimation of shoot nitrogen in different rice genotypes
Plant N uptake and grain yield are important components of N use efficiency. Grain yield is easily measured, but plant N analysis is time consuming and requires hazardous chemicals or expensive equipment. A nondestructive method involving the least equipment and skill, to determine N uptake, is need...
| Main Authors: | , , , , , |
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| Format: | Journal Article |
| Language: | Inglés |
| Published: |
Wiley
1998
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10568/167225 |
| _version_ | 1855540578881634304 |
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| author | Ladha, Jagdish K. Tirol-Padre, Agnes Punzalan, Gloria C. Castillo, E. Singh, Upendra Reddy, C. Kesava |
| author_browse | Castillo, E. Ladha, Jagdish K. Punzalan, Gloria C. Reddy, C. Kesava Singh, Upendra Tirol-Padre, Agnes |
| author_facet | Ladha, Jagdish K. Tirol-Padre, Agnes Punzalan, Gloria C. Castillo, E. Singh, Upendra Reddy, C. Kesava |
| author_sort | Ladha, Jagdish K. |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | Plant N uptake and grain yield are important components of N use efficiency. Grain yield is easily measured, but plant N analysis is time consuming and requires hazardous chemicals or expensive equipment. A nondestructive method involving the least equipment and skill, to determine N uptake, is needed in agronomic and plant breeding experiments. A nondestructive method to determine shoot (aboveground biomass) N of transplanted rice (Oryza sativa L.) was developed based on SPAD‐502 chlorophyll meter readings, leaf area, and tiller number. In two dry‐season and one wet‐season field experiment, shoot N of various genotypes at flowering were highly correlated (P < 0.05) with CLAT, the product of SPAD reading from a selected leaf (C), area of that leaf (LA), and number of tillers (T) (r2 = 0.46, 0.90, and 0.85 in Exp. 1, 2, and 3, respectively); and with LAT, the product of LA and T (r2 = 0.56, 0.88, and 0.76). Shoot N may be estimated using LAT for larger differences in leaf area compared with SPAD readings. Lower correlations in Exp. 1 were due to the lower range in shoot N contents. The highest correlation between shoot N and CLAT was observed in the third uppermost leaf. Regressions of shoot N on LAT and CLAT varied across growth stages and seasons. Thus, LAT or CLAT can be used to evaluate N uptake among N fertilizer treatments and different rice genotypes at a given stage within a season. Further work is needed to assess the reliability of this method under different seasons and cultural practices. |
| format | Journal Article |
| id | CGSpace167225 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 1998 |
| publishDateRange | 1998 |
| publishDateSort | 1998 |
| publisher | Wiley |
| publisherStr | Wiley |
| record_format | dspace |
| spelling | CGSpace1672252025-05-14T10:24:30Z Nondestructive estimation of shoot nitrogen in different rice genotypes Ladha, Jagdish K. Tirol-Padre, Agnes Punzalan, Gloria C. Castillo, E. Singh, Upendra Reddy, C. Kesava nitrogen uptake shoots genotypes nondestructive testing regression analysis Plant N uptake and grain yield are important components of N use efficiency. Grain yield is easily measured, but plant N analysis is time consuming and requires hazardous chemicals or expensive equipment. A nondestructive method involving the least equipment and skill, to determine N uptake, is needed in agronomic and plant breeding experiments. A nondestructive method to determine shoot (aboveground biomass) N of transplanted rice (Oryza sativa L.) was developed based on SPAD‐502 chlorophyll meter readings, leaf area, and tiller number. In two dry‐season and one wet‐season field experiment, shoot N of various genotypes at flowering were highly correlated (P < 0.05) with CLAT, the product of SPAD reading from a selected leaf (C), area of that leaf (LA), and number of tillers (T) (r2 = 0.46, 0.90, and 0.85 in Exp. 1, 2, and 3, respectively); and with LAT, the product of LA and T (r2 = 0.56, 0.88, and 0.76). Shoot N may be estimated using LAT for larger differences in leaf area compared with SPAD readings. Lower correlations in Exp. 1 were due to the lower range in shoot N contents. The highest correlation between shoot N and CLAT was observed in the third uppermost leaf. Regressions of shoot N on LAT and CLAT varied across growth stages and seasons. Thus, LAT or CLAT can be used to evaluate N uptake among N fertilizer treatments and different rice genotypes at a given stage within a season. Further work is needed to assess the reliability of this method under different seasons and cultural practices. 1998-01 2024-12-19T12:57:09Z 2024-12-19T12:57:09Z Journal Article https://hdl.handle.net/10568/167225 en Wiley Ladha, Jagdish K.; Tirol‐Padre, Agnes; Punzalan, Gloria C.; Castillo, E.; Singh, Upendra and Reddy, C. Kesava. 1998. Nondestructive estimation of shoot nitrogen in different rice genotypes. Agronomy Journal, Volume 90 no. 1 p. 33-40 |
| spellingShingle | nitrogen uptake shoots genotypes nondestructive testing regression analysis Ladha, Jagdish K. Tirol-Padre, Agnes Punzalan, Gloria C. Castillo, E. Singh, Upendra Reddy, C. Kesava Nondestructive estimation of shoot nitrogen in different rice genotypes |
| title | Nondestructive estimation of shoot nitrogen in different rice genotypes |
| title_full | Nondestructive estimation of shoot nitrogen in different rice genotypes |
| title_fullStr | Nondestructive estimation of shoot nitrogen in different rice genotypes |
| title_full_unstemmed | Nondestructive estimation of shoot nitrogen in different rice genotypes |
| title_short | Nondestructive estimation of shoot nitrogen in different rice genotypes |
| title_sort | nondestructive estimation of shoot nitrogen in different rice genotypes |
| topic | nitrogen uptake shoots genotypes nondestructive testing regression analysis |
| url | https://hdl.handle.net/10568/167225 |
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