定茶易马[Set tea amounts for the exchange of horse]额定的易马的茶叶斤数。明洪武初,因急需军马,即于西北设茶马司,招商中茶与"番人易马"。但开始无由定数。后来,为使两不吃亏,即将马匹分为上?中?下三等,然后再规定易各等马每匹的茶叶斤数。明代申时行等重修《明会典·茶课》载,洪武"二十二年(1389),定茶易马:上等马每匹一百二十斤,中等马每匹七十斤,下等马每匹五十斤。"但各代或一代不同时期,定茶的数字常有变化。
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