What are the connotations of "Tarbeh Miknaso" and "Tam'it Miknaso"?
Rashi: It means that, if there are many years until the Yovel, the seller charges more, and if there are few years, he charges less. 1
Seforno: It means that, if there are many years until the Yovel, the seller may charge more than the going rate - seeing as the purchaser is able to build sheep-pens and dovecots on the fields; whereas if there only a few years left, he must reduce the sale price - since the purchase is confined to planting corn, and is denied any other benefit that weakens the ground. 2
Having written in Paasuk 25 "be'Mispar Shanim Achar ha'Yovel", why does the Torah need to insert "L'fi Rov ha'Shanim ? L'fi Me'ot ha'Shanim ... "?
Erchin, 29b: Since "be'Mispar Shanim Achar ha'Yovel" implies when many years remain until the Yovel, 1 "L'fi Rov ha'Shanim" teaches us that one may sell a field even when many years have passed since the previous Yovel and it is just before the approaching Yovel; and "L'fi Me'ot ha'Shanim" teaches us that one may sell a field even if it is close to the Yovel that has just passed, and there are many years to go before the nextYovel arrives.
See Torah Temimah, note 104.