The standard method for grain moisture measurement is the conventional air oven-drying technique. This method requires a longer period of time to determine the moisture content (m.c.). Although electric moisture meters are popular in rice industries, it has to be calibrated frequently with the oven-drying method. Therefore, an alternative but fast and reliable method is required, especially, for the grain marketing industries. Three different sizes of paddy (Oryza sativa L.) samples (Bg 300-intermediate bold, Bg 358-short round and At 405-long slender) were used for this study. Five different moisture levels (12–20% wet basis) were prepared by adding known amounts of water. Relationship between the microwave oven and hot air oven moisture values were evaluated using Pearson, Spearman and Kendall correlation coefficient methods. The linear regression relationship was also established between hot air oven and microwave oven moisture determination methods. According to the data, except for 870 W of absorbed MW power setting level, the other two MW power setting (265 W and 550 W) showed a significant statistical correlation (r > 0.55, P < 0.01) between the air oven and MW oven m.c. values of the three paddy samples. However, MW settings of 550 W for 7 min of absorbed power indicated a significantly higher regression coefficient of determination (r2 = 0.94, P < 0.01) with air oven m.c. values. From the study, it can be concluded that the domestic microwave oven can be successfully used to determine the moisture content of different paddy varieties as an alternative method to the conventional air oven-drying method.

中文翻译：

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和烘干微波干燥的比较技术对三种稻谷（水分测定稻L.）品种

谷物水分测量的标准方法是常规的空气烘箱干燥技术。此方法需要更长的时间才能确定水分含量（mc）。尽管电子湿度计在大米行业中很流行，但必须经常用烘箱干燥法进行校准。因此，尤其对于谷物销售行业，需要一种替代但快速且可靠的方法。本研究使用了三种不同大小的稻谷样品（Bg 300-中间粗体，Bg 358-短圆形和At 405-细长）。通过添加已知量的水，可以制备出五种不同的水分含量（以湿基计为12–20％）。使用Pearson，Spearman和Kendall相关系数方法评估了微波炉和热风烤箱水分之间的关​​系。还建立了热风烤箱和微波炉水分测定方法之间的线性回归关系。根据数据，除了吸收的MW功率设置水平为870 W，其他两个MW功率设置（265 W和550 W）显示出空气烤箱和MW烤箱之间的显着统计相关性（r> 0.55，P <0.01）三个水稻样品的mc值。但是，对于7分钟的吸收功率，550 W的MW设置表明，采用空气烤箱mc值时，测定的回归系数显着更高（r2 = 0.94，P <0.01）。从研究中可以得出结论，作为传统风干式干燥方法的替代方法，家用微波炉可以成功地用于确定不同水稻品种的水分含量。