A. Agricultural tithing only applies in the Land of Israel (which is why in Israel they have kosher tithing certification on fruit stores). While voluntary charitable giving is a very popular Jewish phenomenon and exists across the Jewish spectrum, the 10% (or up to 20%) tithe is mostly observed in the more traditional segments of the community. In Hebrew it is called “Maaser”, and is commonly known in observant communities. There’s a lot of gray area and flexibility (depending on many factors, including economic scale) about what can be included in the tithe (i.e. synagogue contributions, Jewish day school tuition etc..) This isn’t as far-fetched as it seems. Some students and alumni of Shabbos House contribute a monthly sum based on their income.