The 37.5% Arable Rent Reduction Act Article 2

(Amount of rent)The amount of rent from farm land shall not exceed 37.5 percent of the total annual harvest of the principal product of its main crops. It shall be reduced to 37.5 per cent if the originally agreed rent is more than 37.5 per cent. It shall not be increased to 37.5 percent if the originally agreed rent is less than 37.5 percent.The main crops referred to in the preceding paragraph shall mean the most common crops planted according to local agriculture habit, or the actual crop in rotation. The principal product referred to in the preceding paragraph shall mean the most important product of the crop that is the purpose of the cultivation.
中文原文 耕地三七五減租條例第2條
耕地地租租額,不得超過主要作物正產品全年收穫總量千分之三百七十五;原約定地租超過千分之三百七十五者,減為千分之三百七十五;不及千分之三百七十五者,不得增加。
前項所稱主要作物,係指依當地農業習慣種植最為普遍之作物,或實際輪植之作物;所稱正產品,係指農作物之主要產品而為種植之目的者。

English translation for reference only; the Chinese text prevails. Not legal advice.