Learn Farsi: بر اساس رویه‌ی استاندارد، ما از این سبزیجات کمپوست تولید می‌کنیم. - Based on the standard procedure, we produce compost from these vegetables.

بر اساس (bar asâs-e) literally means 'on the basis of' or 'based on.' You can absolutely swap it with طبق (tebq-e) or مطابق (motâbeq-e) here to mean 'according to.' All three are complex prepositions that require an ezâfe (the -e sound) to link them to the following noun, which in this case is رویه (raviye).

Why is there a ی at the end of رویه in رویه‌ی استاندارد?

The word for procedure is رویه (raviye), which ends in a silent 'he' (ه). When a word ending in a silent 'he' needs an ezâfe to connect to an adjective like استاندارد, you add a 'ye' sound. In modern writing, this is usually spelled by adding a standalone ی to get رویه‌ی (raviye-ye). Sometimes you might also see it written with a small symbol above the ه (like رویۀ), but adding the full ی is the most standard modern convention.

سبزیجات (sabzijât) has an unusual plural ending. Is this a regular way to make plurals?

The ـجات (-jât) suffix is an Arabic-style plural ending that Farsi occasionally attaches to native Persian words ending in a vowel. It is specifically used to talk about broad categories, assortments, or types of things. For example, سبزیجات means 'vegetables' as a category, میوه‌جات means 'fruits,' and means 'sweets.' You can still use the regular plural (), but sounds a bit more collective and categorical.