Terumot (Hebrew: תרומות, lit. "Donations") is the sixth tractate of Seder Zeraim ("Order of Seeds") of the Mishnah and of the Talmud. It discusses two type of donations, one the terumah which is generally 1/50 of your crop given to the Kohen and 10% of the Masser that is given to Levite is given to the Kohen, called "Terumat Masser." The laws of Terumah are still applicable to produce grown in the Land of Israel. There is debate as to whether the present day obligation is Biblical or Rabbinic. These laws are also mentioned in detail in tractate of "Demai" and "Maasserot".
↑ The Mishnah, ArtScroll Mishnah Series, Seder Zeraim, Tractate Terumos(a), pp. 9-10