米質に関する研究(第2報) : 貯蔵中における玄米の発芽力及び2．3の理学的性質の変化について

The auther has investigated the changes in the germiation capacity and the physical characters on the brown rice during strage, the materials used being stored in Goverment storehouse and placed alone in my laboratory at Matue City (after harvesting). The former were stored for the period from November, 1955 to November, 1956 and the latter November, 1956 to October, 1957. The materials consisted of the brown rice produced at Simane prefecture in Sanin district for rice cropping regions, in Japan and at Okayama prefecture in the Seto Inland Sea coastal district. As there is much rainfall in fall in Sanin, the moisture-content in brown rice, in general, is more for want of sufficient dryness after harvesting than in the other southern districts (e. g. Seto Inland Sea coastal, Tokai, Kyushu and Nankai distrlct). Therefore, the rice produced in Sanin district are described as said to be the "Nansitu-Mai" and are unable to be stored for a long period of time. The results obtained can be summarized as follows:
In the case of the storing in the same place, viz. same in the air humidity during storage, the moisture content in the samples in which had been contained the various amount of water at the experiment beginning (before storing) was influenced by air humidity in process of time and resulted nearly same. But this imperceptible differences denoted still the appearance of the differences in the moisture content in the samples before storing.
The decrease of germination capacity on the samples being stored in the Goverment storehouse, was clearly found after fumigating for the storing management on June 20, 1956 and moreover, was markedly towards the end of July, 1956. And in the case of storage in the laboratory, the germination capacity on the greater part of the varieties of the samples which were produced at Simane prefecture decreased markedly at the late in July, 1957 (the germination percentage on any samples was below 70%) and thereafter, was on the decrease. But the germination percentage was still more than 70% at the late in September, 1957 on a variety in the Okayama samples and on another variety, the decrease was markedly found at the begining of September, 1957.
Therefore, it is possible to consider that the longerity of the brown rice produced in southern districts is longer than the "Nansitu-Mai". Moreover, it was shown strikingly that in the case of the storing under the dryness, the moisture content in the brown rice produced in any districts resulted in the decrease as described above and in consequence, the germination capacity was not reduced at all in course of storage.
The filtering velocity of exuded solutions of the brown nce varied with the varieties but it was not found as far as this experiment concerened that the velocity varied with the district and also that on the "Nansitu-Mai" the velocity was higher, but it was clearly showed that the filtering velocity increased in process of the storage and that even in the same varieties, varied with the moisture-content in the samples before or during storage and also that was lower under the dryness.