| 光谱学与光谱分析 |
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| Active Crop Canopy Sensor-Based Nitrogen Diagnosis for Potato |
| YU Jing1, LI Fei2, QIN Yong-lin1, FAN Ming-shou1* |
1. College of Agronomy，Inner Mongolia Agricultural University，Huhhot 010019，China
2. College of Ecology and Environmental Science，Inner Mongolia Agricultural University，Huhhot 010019，China |
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Abstract In the present study, two potato experiments involving different N rates in 2011 were conducted in Wuchuan County and Linxi County, Inner Mongolia. Normalized difference vegetation index (NDVI) was collected by an active GreenSeeker crop canopy sensor to estimate N status of potato. The results show that the NDVI readings were poorly correlated with N nutrient indicators of potato at vegetative Growth stage due to the influence of soil background. With the advance of growth stages, NDVI values were exponentially related to plant N uptake(R2=0.665) before tuber bulking stage and were linearly related to plant N concentration(R2=0.699) when plant fully covered soil. In conclusion, GreenSeeker active crop sensor is a promising tool to estimate N status for potato plants. The findings from this study may be useful for developing N recommendation method based on active crop canopy sensor.
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Received: 2013-02-01
Accepted: 2013-04-24
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Corresponding Authors:
FAN Ming-shou
E-mail: fmswh@imau.edu.cn
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