Physical Properties of Soybeans in the Northern Thailand

在泰国，大豆作为蛋白质、脂肪和维生素的重要来源发挥着重要作用。此外，近期动物饲料消费的扩大也加速了大豆的国内需求。这造成了大豆的严重短缺，导致进口增加。本课题旨在研究大豆含水率、冲击位置和冲击速度对种子品质和危害的影响。冲击试验机由旋转冲击盘和与冲击盘同步的持豆盘组成。冲击盘由连接到速度控制器的可变电机驱动。豆子持有盘有1.3毫米直径的径向孔，这些孔连接到130毫米汞的真空系统，没有放置豆子。用手将豆子以所需的方向放置在圆盘上的孔上，用部分真空保持，直到被冲击圆盘边缘的尖端撞击。受影响的豆子被悬挂在豆子堆上的帘子挡住了。以大豆CM60品种为研究对象，研究了不同速度对籽粒侧位和前位水分含量的影响。试验采用同步持豆盘的额定冲击试验机。试验结果表明，在10.7% ~ 16.7%的水分水平下，6.1和12.9 m/s的冲击对大豆种子没有明显的损害。19.1和25.1 m/s的冲击速度对大豆造成一定的物理损伤。正面撞击比侧面撞击造成的伤害更大。干燥的种子比含水量高的种子更容易发生病害。撞击速度与种子含水率之间也存在交互作用。虽然部分种子未受影响，但其发芽质量受到影响。正面撞击比侧面撞击对种子萌发的影响更明显。较高的撞击速度比较低的撞击速度更能降低种子萌发。低含水率对种子的影响大于高含水率对种子的影响。少

Soybeans in Thailand have playd an important role as a source of protein, fat and vitamins. Also the domestic demand of soybeans have been accelerated by the recent expansion of animal feed consumption. This has caused high shortage of soybeans resulting in the increase of impportation.Tha objective of this project is to sstudy the effects of soybean moisture content, position of impact and impact speed on seed qualities and damages.The impact tester consists of a rotating impact disk and a bean holding disk synchronized with the impacting disk. The impact disk is driven by a variable motor which is connected to the speed controller. The bean holding disk has 1.3 mm diameter radial holes which are connected to a vacuum system of 130 mm mercury with no bean placed. Beans placed by hand in desired orientation over the hole in the disk are held by partial vacuum until impacted by the tip at the edge of the impact disk. The impacted beans are caught by a curtain hanging over the bean colle … More ctor.Soybean CM60 variety was investigated by impacting the seeds at different speeeds and moisture contents at side and front positions. The ratating impact tester with synchronized bean holding diks was used in the experiment. Test results showed that bean impacted at 6.1 and 12.9 m/s caused no visible damage to soybean seeds at all moisture levels from 10.7 to 16.7 %. Impact speeds of 19.1 and 25.1 m/s caused some physical damage to soybean. Impact at front posiition made more damage than at side position. Drier seeds were sucessible to dameges more than the having higher moisture contents. Interaction was also found between impact speeds and seed moisture contents.Although no damage was noted in some seeds, their quality in terms of germination was affected by impact. Influence of impact on germination was more apparent when the seed was hit at front position than side position. Higher impact speeds could lower germination more than low impact speeds. Moreover, seeds at low moisture contents were more affected than seeds at higher moisture. Less