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Sensors 2017, 17(10), 2287;

In-Season Yield Prediction of Cabbage with a Hand-Held Active Canopy Sensor

State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
University of Chinese Academy of Sciences, Beijing 100049, China
Department of Plant and Soil Sciences, Oklahoma State University, Stillwater, OK 74078-6028, USA
Author to whom correspondence should be addressed.
Received: 23 August 2017 / Revised: 30 September 2017 / Accepted: 3 October 2017 / Published: 8 October 2017
(This article belongs to the Section Remote Sensors)
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Efficient and precise yield prediction is critical to optimize cabbage yields and guide fertilizer application. A two-year field experiment was conducted to establish a yield prediction model for cabbage by using the Greenseeker hand-held optical sensor. Two cabbage cultivars (Jianbao and Pingbao) were used and Jianbao cultivar was grown for 2 consecutive seasons but Pingbao was only grown in the second season. Four chemical nitrogen application rates were implemented: 0, 80, 140, and 200 kg·N·ha−1. Normalized difference vegetation index (NDVI) was collected 20, 50, 70, 80, 90, 100, 110, 120, 130, and 140 days after transplanting (DAT). Pearson correlation analysis and regression analysis were performed to identify the relationship between the NDVI measurements and harvested yields of cabbage. NDVI measurements obtained at 110 DAT were significantly correlated to yield and explained 87–89% and 75–82% of the cabbage yield variation of Jianbao cultivar over the two-year experiment and 77–81% of the yield variability of Pingbao cultivar. Adjusting the yield prediction models with CGDD (cumulative growing degree days) could make remarkable improvement to the accuracy of the prediction model and increase the determination coefficient to 0.82, while the modification with DFP (days from transplanting when GDD > 0) values did not. The integrated exponential yield prediction equation was better than linear or quadratic functions and could accurately make in-season estimation of cabbage yields with different cultivars between years. View Full-Text
Keywords: Greenseeker; cabbage; NDVI; yield prediction; CGDD Greenseeker; cabbage; NDVI; yield prediction; CGDD

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Ji, R.; Min, J.; Wang, Y.; Cheng, H.; Zhang, H.; Shi, W. In-Season Yield Prediction of Cabbage with a Hand-Held Active Canopy Sensor. Sensors 2017, 17, 2287.

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