Fertilizer-Nitrogen Use Efficiency Of Irrigated Wheat .2. Partitioning Efficiency Of Preplant Versus Late-Season Application
Partitioning of N to grain is an important determinant of N‐use efficiency in wheat (Triticum aestivum L.). This study evaluated the effects of N‐fertilizer treatments on N partitioning, and compared the partitioning of labeled N applied at planting with labeled N applied at anthesis. A 2‐yr field e...
| Autores principales: | , |
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| Formato: | Journal Article |
| Lenguaje: | Inglés |
| Publicado: |
Wiley
1992
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| Acceso en línea: | https://hdl.handle.net/10568/167504 |
| _version_ | 1855540796242001920 |
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| author | Wuest, S.B. Cassman, K.G. |
| author_browse | Cassman, K.G. Wuest, S.B. |
| author_facet | Wuest, S.B. Cassman, K.G. |
| author_sort | Wuest, S.B. |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | Partitioning of N to grain is an important determinant of N‐use efficiency in wheat (Triticum aestivum L.). This study evaluated the effects of N‐fertilizer treatments on N partitioning, and compared the partitioning of labeled N applied at planting with labeled N applied at anthesis. A 2‐yr field experiment was conducted with applications of 120, 180, or 240 kg N ha−1 at planting and 0, 30, or 60 kg N ha−1 at anthesis. The mean N harvest index (NHI) of N acquired from fertilizer applied at planting was 0.70, compared to 0.89 for that N acquired from fertilizer applied at anthesis. Mean NHI of total plant N derived from all sources (fertilizer and soil) was 0.74. The amount of N applied at anthesis had little effect on N partitioning, but increasing rates of preplant N from 120 to 240 kg N ha−1 caused a decrease in NHI averaging 0.10 the first yr and 0.04 the second yr. A second 2‐yr experiment, using similar N treatments and a small dose (<1 kg ha−1) of NH4−15N injected into the soil at anthesis verified these results. In the second experiment the effects of preplant N on NHI differed between cultivars; Yecora Rojo was considerably more efficient than Anza at high preplant N rates. Fertilizer N applied at anthesis was found in leaf, stem, and spike tissue 14 days after anthesis and contributed 4.2 to 16.8% of the N in each tissue at that time. Anthesis N fertilizer was also well distributed among structural, soluble, and ribulose‐1,5‐diphosphate carboxylase N feactions of flag leaves. This study demonstrated that the early season N environment has a large influence on N partitioning at maturity, whereas N applied at anthesis has little effect on N partitioning and is allocated more efficiently to grain. |
| format | Journal Article |
| id | CGSpace167504 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 1992 |
| publishDateRange | 1992 |
| publishDateSort | 1992 |
| publisher | Wiley |
| publisherStr | Wiley |
| record_format | dspace |
| spelling | CGSpace1675042025-05-14T10:40:00Z Fertilizer-Nitrogen Use Efficiency Of Irrigated Wheat .2. Partitioning Efficiency Of Preplant Versus Late-Season Application Wuest, S.B. Cassman, K.G. Partitioning of N to grain is an important determinant of N‐use efficiency in wheat (Triticum aestivum L.). This study evaluated the effects of N‐fertilizer treatments on N partitioning, and compared the partitioning of labeled N applied at planting with labeled N applied at anthesis. A 2‐yr field experiment was conducted with applications of 120, 180, or 240 kg N ha−1 at planting and 0, 30, or 60 kg N ha−1 at anthesis. The mean N harvest index (NHI) of N acquired from fertilizer applied at planting was 0.70, compared to 0.89 for that N acquired from fertilizer applied at anthesis. Mean NHI of total plant N derived from all sources (fertilizer and soil) was 0.74. The amount of N applied at anthesis had little effect on N partitioning, but increasing rates of preplant N from 120 to 240 kg N ha−1 caused a decrease in NHI averaging 0.10 the first yr and 0.04 the second yr. A second 2‐yr experiment, using similar N treatments and a small dose (<1 kg ha−1) of NH4−15N injected into the soil at anthesis verified these results. In the second experiment the effects of preplant N on NHI differed between cultivars; Yecora Rojo was considerably more efficient than Anza at high preplant N rates. Fertilizer N applied at anthesis was found in leaf, stem, and spike tissue 14 days after anthesis and contributed 4.2 to 16.8% of the N in each tissue at that time. Anthesis N fertilizer was also well distributed among structural, soluble, and ribulose‐1,5‐diphosphate carboxylase N feactions of flag leaves. This study demonstrated that the early season N environment has a large influence on N partitioning at maturity, whereas N applied at anthesis has little effect on N partitioning and is allocated more efficiently to grain. 1992-07 2024-12-19T12:57:27Z 2024-12-19T12:57:27Z Journal Article https://hdl.handle.net/10568/167504 en Wiley Wuest, S. B.; Cassman, K. G. 1992. Fertilizer-Nitrogen Use Efficiency Of Irrigated Wheat .2. Partitioning Efficiency Of Preplant Versus Late-Season Application. Agronomy Journal, Volume 84 no. 4 p. 689-694 |
| spellingShingle | Wuest, S.B. Cassman, K.G. Fertilizer-Nitrogen Use Efficiency Of Irrigated Wheat .2. Partitioning Efficiency Of Preplant Versus Late-Season Application |
| title | Fertilizer-Nitrogen Use Efficiency Of Irrigated Wheat .2. Partitioning Efficiency Of Preplant Versus Late-Season Application |
| title_full | Fertilizer-Nitrogen Use Efficiency Of Irrigated Wheat .2. Partitioning Efficiency Of Preplant Versus Late-Season Application |
| title_fullStr | Fertilizer-Nitrogen Use Efficiency Of Irrigated Wheat .2. Partitioning Efficiency Of Preplant Versus Late-Season Application |
| title_full_unstemmed | Fertilizer-Nitrogen Use Efficiency Of Irrigated Wheat .2. Partitioning Efficiency Of Preplant Versus Late-Season Application |
| title_short | Fertilizer-Nitrogen Use Efficiency Of Irrigated Wheat .2. Partitioning Efficiency Of Preplant Versus Late-Season Application |
| title_sort | fertilizer nitrogen use efficiency of irrigated wheat 2 partitioning efficiency of preplant versus late season application |
| url | https://hdl.handle.net/10568/167504 |
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