Commentary for Avodah Zarah 100:8
ודלמא כדרב עוקבא בר חמא דאמר רב עוקבא בר חמא תרי קשקושי הוו חד לאברויי אילנא ואסור וחד לסתומי פילי ושרי ה"נ תרי זיהמומי הוי חד לאוקומי אילני ושרי וחד לאברויי אילני ואסור
Perhaps [the contradiction might be solved] according to the statement of R. Ukba b. Hama who said: There are two kinds of hoeing; one to strengthen the tree and this is prohibited [in the Sabbatical year] and the other to close up cracks and this is permitted. Similarly here there are two kinds of placing manure; one is to preserve the tree and is permitted and the other to strengthen the tree and is prohibited!
Daf Shevui to Avodah Zarah
This difficulty also may be solved. There may be two different kinds of placing manure on the branch—one is to strengthen the tree, and this is prohibited. The other is to preserve the tree and is permitted.
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