Jamieson, Fausset and Brown on Ruth 2:7

7. she said ... Let me glean and gather after the reapers among the sheaves--Various modes of reaping are practised in the East. Where the crop is thin and short, it is plucked up by the roots. Sometimes it is cut with the sickle. Whether reaped in the one way or the other, the grain is cast into sheaves loosely thrown together, to be subjected to the process of threshing, which takes place, for the most part, immediately after the reaping. Field labors were begun early in the morning--before the day became oppressively hot.

she tarried a little in the house--that is, the field tent, erected for the occasional rest and refreshment of the laborers.