Rapid Diagnosis of the Nitrogen Status of the Wild Lowbush Blueberry
ABSTRACTOptical instruments were proposed to assess the nitrogen (N) concentration of the leaves of wild lowbush blueberries (Vaccinium angustifolium Ait.). The objectives were to assess the effects of NPK fertilizer rates on leaf N concentrations and optical measurement values and to examine the re...
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| Format: | Article |
| Language: | English |
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Taylor & Francis Group
2023-12-01
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| Series: | International Journal of Fruit Science |
| Subjects: | |
| Online Access: | https://www.tandfonline.com/doi/10.1080/15538362.2022.2162656 |
| _version_ | 1797389862581567488 |
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| author | Jean Lafond |
| author_facet | Jean Lafond |
| author_sort | Jean Lafond |
| collection | DOAJ |
| description | ABSTRACTOptical instruments were proposed to assess the nitrogen (N) concentration of the leaves of wild lowbush blueberries (Vaccinium angustifolium Ait.). The objectives were to assess the effects of NPK fertilizer rates on leaf N concentrations and optical measurement values and to examine the relationship between leaf N concentration and optical measurements. Four rates of ammonium sulfate (0 to 90 kg N ha−1), two rates of P (0 and 20 kg P2O5 ha−1) and four rates of K (0 to 90 kg K2O ha−1) were applied in the spring of the sprout year. Leaf sampling and optical measurements were conducted four times during the sprout year. Optical measurements were made with a SPAD-502 meter (Minolta) and a Dualex3 meter (Force-A). Leaf N concentrations decreased during the growing season while SPAD and Dualex3 values increased, although SPAD values dropped at the end of the season. N rates increased leaf N concentrations and SPAD values on all sampling dates while decreasing Dualex3 values. The best estimate of leaf N concentration was obtained with SPAD measurements and with the SPAD/Dualex3 ratio carried out at the end of July (r2 > 0.73). However, as optical measurements depend on the sites, reference plots are needed to standardize the values. |
| first_indexed | 2024-03-08T23:02:15Z |
| format | Article |
| id | doaj.art-29f7de6f76c64eaf9fd70a25bf1df26b |
| institution | Directory Open Access Journal |
| issn | 1553-8362 1553-8621 |
| language | English |
| last_indexed | 2024-03-08T23:02:15Z |
| publishDate | 2023-12-01 |
| publisher | Taylor & Francis Group |
| record_format | Article |
| series | International Journal of Fruit Science |
| spelling | doaj.art-29f7de6f76c64eaf9fd70a25bf1df26b2023-12-15T14:46:53ZengTaylor & Francis GroupInternational Journal of Fruit Science1553-83621553-86212023-12-01231132410.1080/15538362.2022.2162656Rapid Diagnosis of the Nitrogen Status of the Wild Lowbush BlueberryJean Lafond0Agriculture and Agri-Food Canada, Quebec Research and Development Centre, Research Farm, Normandin, QC, CanadaABSTRACTOptical instruments were proposed to assess the nitrogen (N) concentration of the leaves of wild lowbush blueberries (Vaccinium angustifolium Ait.). The objectives were to assess the effects of NPK fertilizer rates on leaf N concentrations and optical measurement values and to examine the relationship between leaf N concentration and optical measurements. Four rates of ammonium sulfate (0 to 90 kg N ha−1), two rates of P (0 and 20 kg P2O5 ha−1) and four rates of K (0 to 90 kg K2O ha−1) were applied in the spring of the sprout year. Leaf sampling and optical measurements were conducted four times during the sprout year. Optical measurements were made with a SPAD-502 meter (Minolta) and a Dualex3 meter (Force-A). Leaf N concentrations decreased during the growing season while SPAD and Dualex3 values increased, although SPAD values dropped at the end of the season. N rates increased leaf N concentrations and SPAD values on all sampling dates while decreasing Dualex3 values. The best estimate of leaf N concentration was obtained with SPAD measurements and with the SPAD/Dualex3 ratio carried out at the end of July (r2 > 0.73). However, as optical measurements depend on the sites, reference plots are needed to standardize the values.https://www.tandfonline.com/doi/10.1080/15538362.2022.2162656Vaccinium angustifolium Ait.SPADDualex3optical measurementsnitrogen |
| spellingShingle | Jean Lafond Rapid Diagnosis of the Nitrogen Status of the Wild Lowbush Blueberry International Journal of Fruit Science Vaccinium angustifolium Ait. SPAD Dualex3 optical measurements nitrogen |
| title | Rapid Diagnosis of the Nitrogen Status of the Wild Lowbush Blueberry |
| title_full | Rapid Diagnosis of the Nitrogen Status of the Wild Lowbush Blueberry |
| title_fullStr | Rapid Diagnosis of the Nitrogen Status of the Wild Lowbush Blueberry |
| title_full_unstemmed | Rapid Diagnosis of the Nitrogen Status of the Wild Lowbush Blueberry |
| title_short | Rapid Diagnosis of the Nitrogen Status of the Wild Lowbush Blueberry |
| title_sort | rapid diagnosis of the nitrogen status of the wild lowbush blueberry |
| topic | Vaccinium angustifolium Ait. SPAD Dualex3 optical measurements nitrogen |
| url | https://www.tandfonline.com/doi/10.1080/15538362.2022.2162656 |
| work_keys_str_mv | AT jeanlafond rapiddiagnosisofthenitrogenstatusofthewildlowbushblueberry |