In which they were planted ten in a בית סאה, etc. - ממטע י' לבית סאה
The רשב"ם maintains that if there are more than ten trees per ב"ס it is not a חזקה; however תוספות maintains it is. The רשב"א differentiates whether he ate all the trees or whether he ate some of them. If there were less that ten trees per ב"ס the רשב"ם maintains he is קונה as per the need of the trees, while תוספות maintains he is not קונה any קרקע at all.
In which they were planted ten in a בית סאה, etc. - ממטע עשרה לבית סאה
חזקה can be even י' לב"ס (which is sparse) since this is שיעור יניקה, however מכר must be denser (י"ו בין אילן לאילן) according to אביי for this is the דרך. We may either assume that מכר and הקדש are different, or that both are the same and there is an argument whether both require י"ו or י' לב"ס.