BACKGROUND: The water footprint(WF) is an indicator of freshwater use that looks not only at direct water use of a consumer or producer, but also at the indirect water use. As an indicator of ‘water use’, the water footprint includes the green, blue, grey WF, and differs from the classical measure of ‘water withdrawal’ because of green and grey WF. This study was conducted to assess and estimate the water footprint of the soybean and Chinese cabbage.
METHODS AND RESULTS: For analyzing the WF of the crops, APEX model with weather data, soil and water quality data from NAS(National Institute of Agricultural Sciences), farming data from RDA(Rural Development Administration) was operated. When the yield estimated by APEX was compared with the yield by statistic data from each county for an assessment on usefulness of APEX, the coefficients of determination were 0.83 for soybean, 0.97 for Chinese cabbage. The WF of the soybean, Chinese cabbage at production procedure were 1,985 L/Kg, 58 L/Kg. This difference would be originated from the cultivation duration. The WF ratios of soybean were 91.1 % for green WF, 8.9 % for grey WF, but the ratios of Chinese cabbage were 41.5 % for green WF, 58.5 % for grey WF.
CONCLUSION: This means that the efficiency of water use on soybean is better than the efficiency on Chinese cabbage. The results could also be useful as an information to assess environmental impact on water use and agricultural farming for soybean, and Chinese cabbage.