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In order to determine the optimum sowing date of peanut in the middle part of Korea, peanut´s 100-grain-weight and physico-chemical compositions for peanut cultivars such as runner (Yeoju landrace), semi-spanish (Suweon No. 15) and Spanish types (Wasedairu) to different seeding date which planted at interval of ten days from May 5 to July 4, in 1981, was carried out. The 100-grain-weight and crude fat of peanut were increased from May 5 to May 25, but after that decreased. And the 100-grain-weight of peanut was great in order of Wasedairu, Suweon No. 15 and Yeoju landrace. The highest amount of crude fat was seen in peanuts which was sown at May 25 and May 15. Unsaturated fatty acids are composed of 80∼85% of oleic and linoleic acid, but saturated fatty acids are constituted of 10∼15% of palmitic acid and 1∼5% of stearic and arachidic acid. Composition ratio of fatty acid in peanut was changed greatly according to sowing date. According to the late sowing date linoleic and palmitic acid were increased but oleic acid was decreased, respectively.
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