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What special-effect chemicals are used to straighten and lengthen yardlong beans
Yardlong beans are one of the popular vegetables widely cultivated in northern China, and their popularity ranks first among all kinds of vegetables. However, quite a few farmer friends report that the yardlong beans they grow are neither long nor straight, and sell poorly. So, what special-effect chemicals are used to straighten and lengthen yardlong beans? 1.