Commentary for Kiddushin 52:1
ולכתוב עליה פרוסבול ולקנות עמה נכסים שאין להם אחריות ואי אמרת בעינן צבורים כל שהוא למאי חזי
[is fit] for a prosbul<span class="x" onmousemove="('comment',' V. Glos. The prosbul was a deed whereby a creditor transferred his debts to the Beth din, which were then regarded as though already collected from the debtor, so that the seventh year did not cancel them. This was done only if the debtor possessed land. - This measure was instituted by Hillel, who saw that people refused to lend money when the seventh year was approaching, with consequent hardships for the poor; v. Git. 36a.');"><sup>1</sup></span> to be written thereon, and that property which does not provide security [movables] shall be acquired along with it. But if you say: They must be heaped thereon, for what is a very small piece of land fit? - R'Samuel B'Bisna explained it in R'Joseph's presence: E.g. , if he sticks a needle therein.<span class="x" onmousemove="('comment',' Which is acquired along with the land.');"><sup>2</sup></span>
Daf Shevui to Kiddushin
The fact that R. Akiva says that movables can be acquired even with a small piece of land seems to imply that the movables need not be on the land. Otherwise, why mention that the land need not be of a minimum size.
[A prosbul allows debts to not be remitted during the sabbatical year. For this document to be written, the debtor must own some land, even an amount far smaller than his actual debt. Peah is the corners of land left for the poor. First fruits are brought to the Temple.]