Moisture Transfers of Rough Rice during Fruiting Stage and Moisture Absorption

Abstract

The rough rice in the field varies its moisture content with in a day because of the absorption in the night and the drying in the day. The rough rice harvested by the combine varies its moisture content depending on the harvesting time, that has much influence on the operation of the dryer after the harvest. Therefore, the variation of moisture content and the absorption characteristics of the brown rice were surveyed.
1) The differences of the atmospheric temperatures with in a fine day in the middle of October and of November were 13-18°C and the humidity change was about 70%. These climatic variations produce a daily change of 2.5-5.6% moisture contents in rough rice.
2) The absorption velocity of the brown rice depended upon the temperature, the volume of adhering moisture and its moisture content. The higher the temperature and the more the adhering moisture and the lower the moisture content, the easier the absorption.