Commentary for Avodah Zarah 87:4
ולא והתניא אלו ואלו מתערבין באמה ויוצאין לנחל קדרון ונמכרין לגננין לזבל ומועלין בהן מקומות מקומות יש בו יש מקום מגדל צמחין ויש מקום שאין מגדל צמחין
But is it not? Has it not been taught: [The blood of] the various [sacrifices] mingled in the aqueduct and flowed into the brook of Kidron and was sold to gardeners for manure. And one who uses it is guilty of trespass. There are different kinds of places there, in some vegetation grows and some it does not.
Daf Shevui to Avodah Zarah
The Talmud cites a baraita about the blood that runs off from the sacrifices in the Temple. This blood would flow into the brook of Kidron and the water/blood mixture was sold as fertilizer to farmers. This is proof that the brook of Kidron does have vegetation, which now is a proof for R. Yose, that one may nevertheless grind up an idol, just as Asa did The other rabbis would answer that the brook of Kidron has several areas. Asa would have ground the idol up in a place without vegetation, for otherwise this is prohibited.
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