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Estimation of Chinese Cabbage Growth by RapidEye Imagery and Field Investigation Data

  • Na, Sangil (Climate Change and Agro-Ecology Division, National Academy of Agricultural Science, RDA) ;
  • Lee, Kyoungdo (Climate Change and Agro-Ecology Division, National Academy of Agricultural Science, RDA) ;
  • Baek, Shinchul (Climate Change and Agro-Ecology Division, National Academy of Agricultural Science, RDA) ;
  • Hong, Sukyoung (Climate Change and Agro-Ecology Division, National Academy of Agricultural Science, RDA)
  • Received : 2015.09.02
  • Accepted : 2015.10.23
  • Published : 2015.10.31

Abstract

Chinese cabbage is one of the most important vegetables in Korea and a target crop for market stabilization as well. Remote sensing has long been used as a tool to extract plant growth, cultivated area and yield information for many crops, but little research has been conducted on Chinese cabbage. This study refers to the derivation of simple Chinese cabbage growth prediction equation by using RapidEye derived vegetation index. Daesan-myeon area in Gochang-gun, Jeollabuk-do, Korea is one of main producing district of Chinese cabbage. RapidEye multi-spectral imagery was taken on the Daesan-myeon five times from early September to late October during the Chinese cabbage growing season. Meanwhile, field reflectance spectra and five plant growth parameters, including plant height (P.H.), plant diameter (P.D.), leaf height (L.H.), leaf length (L.L.) and leaf number (L.N.), were measured for about 20 plants (ten plants per plot) for each ground survey. The normalized difference vegetation index (NDVI) for each of the 20 plants was measured using an active plant growth sensor (Crop $Circle^{TM}$) at the same time. The results of correlation analysis between the vegetation indices and Chinese cabbage growth data showed that NDVI was the most suited for monitoring the L.H. (r=0.958~0.978), L.L. (r=0.950~0.971), P.H. (r=0.887~0.982), P.D. (r=0.855~0.932) and L.N. (r=0.718~0.968). Retrieval equations were developed for estimating Chinese cabbage growth parameters using NDVI. These results obtained using the NDVI is effective provided a basis for establishing retrieval algorithm for the biophysical properties of Chinese cabbage. These results will also be useful in determining the RapidEye multi-spectral imagery necessary to estimate parameters of Chinese cabbage.

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