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
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.
Key words：Potato;Nitrogen diagnosis;Plant N concentration;Plant N uptake;NDVI
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