Bava Batra

in the first and third years? Even one day would be enough.  — No! Both are agreed that ploughing does not help to confer)hazakah, and the difference between them is whether a full or partially grown crop is required.  Our Rabbis taught: Ploughing does not help to confer hazakah. Some authorities hold, however, that it does help. Who are 'some authorities'? — R. Hisda said: This is the opinion of R. Aha, as we see from the following: If a man ploughs a field fallow one year and sows it two,  or [even] ploughs it fallow two years and sows it one, this does not confer hazakah. R. Aha, however, says that it does give him a presumptive right. R. Bibi inquired of R. Nahman: What is the reason of those authorities who lay down that ploughing does confer hazakah? — [He answered:] A man will not see someone else plough his field and keep quiet. And what is the reason of those who say that ploughed fallow does not confer hazakah? — Because the owner says to himself, 'The more he ploughs the better for me.'  The people of Pum Nahara sent to inquire of R. Nahman b. R. Hisda as follows: Will our master be so good as to instruct us whether ploughed fallow helps to confer hazakah or not? He replied: R. Aha and all the chief authorities of the age hold that ploughed fallow does help to confer hazakah. R. Nahman b. Isaac said: You gain nothing by citing authorities;  for Rab and Samuel in Babylon and R. Ishmael and R. Akiba in Eretz Yisrael held that ploughing does not help to confer presumptive right. The views of R. Ishmael and R. Akiba [on the subject] can be derived from the Mishnah.  Where do we find the view of Rab on the subject? — In the following statement: Rab Judah said in the name of Rab: This  is the view of R. Ishmael and R. Akiba, but the Sages say that the hazakah [of such a field] is conferred only by occupation for three full years.  Now the expression 'full years' is intended to exclude ploughed fallow, is it not?  Where is the view of Samuel on the subject expressed? — In the following statement: Rab Judah said in the name of Samuel: This is the view of R. Ishmael and R. Akiba, but the Sages say that hazakah is not obtained until the occupier- has gathered in three crops of dates and culled three vintages and plucked three crops of olives. Where does the difference arise between Rab and Samuel? — The difference arises In the case of a young date tree. R. ISHMAEL SAID: THIS APPLIES ONLY TO A CORNFIELD etc. Abaye said: On the strength of R. Ishmael's ruling,  we may attribute the following opinion to the Rabbis.  Suppose a man has thirty trees in a field planted ten to the beth se'ah,  then if he takes the produce of ten in one year, ten in the next, and ten in the third year, this constitutes hazakah.