This study was undertaken to determine the plant characteristics related to deterioration of the quality of grain and fl our of wheat caused by rainfall during the ripening period. The rainfall during the ripening period caused damage to the grains in appearance, 1000−grain weight and bulk density and damage to fl our in falling number and color. Norin 61 exposed to rainfall during the ripening period retained a relatively high quality in fl our color and falling number than Chikugoizumi , Iwainodaichi and Saikai 185 , even though Norin 61 was lodged down severely by rainfall. Because the grain of Norin 61 was completely wrapped in by its lemma and palea, the water content of the grain was less increased by the rainfall than other varieties, resulting in less deterioration of grain and fl our quality. The fl our of Norin 61 also retained a higher quality than the other varieties for 24 hours after mixing with water.
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