| Hyperspectral response of sugar beet to nitrogen fertilizer treatments in drip irrigation |
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| DOI：10.7606/j.issn.1000-7601.2018.06.26 |
| Key Words: nitrogen treatment beet drip irrigation canopy hyperspectral response red edge parameter |
| Author Name | Affiliation | | LI Zong-fei | Agronomy College, Shihezi University, Shihezi 832003, China | | CHEN Bing | Cotton Institute of Xinjiang Academy of Agricultural and Reclamation Science, Shihezi, Xinjiang 832003,China | | SU Ji-xia | Agronomy College, Shihezi University, Shihezi 832003, China | | FEI Cong | Agronomy College, Shihezi University, Shihezi 832003, China | | LI Yang-yang | Agronomy College, Shihezi University, Shihezi 832003, China | | LIU Ning-ning | Agronomy College, Shihezi University, Shihezi 832003, China | | TANG Li-hua | Agronomy College, Shihezi University, Shihezi 832003, China | | ZHOU Hong-liang | Agronomy College, Shihezi University, Shihezi 832003, China | | GENG Qing-yun | Tacheng Agricultural Technology Extension Center, Tacheng 834700, Xinjiang, China | | FAN Hua | Agronomy College, Shihezi University, Shihezi 832003, China |
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| Abstract: |
| In order to better understand the hyperspectral characteristics of sugar beet canopy, the canopy reflectance spectrum and the total nitrogen content of the leaves were determined in a field experiment. The leaf area index (LAI) and chlorophyll content, the hyperspectral characteristics of sugar beet under different nitrogen fertilizer treatments were studied. Meanwhile, the correlation between the red edge parameters of the canopy and its spectral variables, and the total nitrogen content, LAI, and chlorophyll content were analyzed. The results showed that the spectral values of sugar beet were significant different among different growth stages, especially, in near infrared range (700~1 300 nm). The spectral reflectance of canopy under different nitrogen application rates were also significant different. In the rapid growth period of leaf cluster and increased with increasing nitrogen application rates. Conopy reflectance and “red edge” of nitrogen management model 7∶3 were lower than nitrogen management 10∶0 in the leaves rapid growth period, but higher in the sugar accumulation period. The red edge of beet canopy spectrum had a Twin-peak phenomenon, but the Twin-peak phenomenon gradually weakened with the growth and this change became more apparent with increasing nitrogen application rate. A significant correlation between the spectral variables and total nitrogen content of the leaves was observed. Additionally, the red edge amplitude Dλred, the red edge area Sred, and the red edge position λred, significantly correlated with LAI, and chlorophyll. Therefore, it is possible to diagnose nitrogen nutrition status of sugar beets by using hyperspectral variables of its canopy under drip irrigation. |
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