This paper describes two methods of yield mapping in Japanese paddy fields. One is the yield mapping of grain and straw by hand at the Takatsuki experimental farm of Kyoto University. The variety of rice was MINAMI-HIKARI. The field was divided intothree kinds of the rectangular cells. Yield maps showed large variability in relation to position. The variability of grain and straw yield were 5.4 to 9.7t ha~-1 and 6.2 to 18.0t ha~-1, respectively. The moisture content of grain and straw varied 9.5 to23.1% wb and 37.8 to 73.0% wb, respectively. The second method was conducted as a trial to measure the yield of grain and straw using a head-feeding combine. In this case, measurement of grain yield through straw yield also was investigated. We estimated the relation of yield between grain and straw and produced the grain yield map by this method.
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