'Fields' in the Bible

Now there were shepherds in the same part of the country, keeping watch over their sheep by night in the open fields,

And He addressed them thus: "The harvest is abundant, but the reapers are few: therefore entreat the Owner of the harvest to send out more reapers into His fields. And now go.

But if God so clothes the vegetation in the fields, that blooms to-day and to-morrow will be thrown into the oven, how much more certainly will He clothe you, you men of feeble faith!