Learn French: Dans son grand champ, le fermier produit du blé. - In his large field, the farmer produces wheat.

The pronoun en replaces nouns that are introduced by a partitive article like du. Since the sentence uses du blé (some wheat), we can replace it with en to simply say "the farmer produces some". Remember that en goes right before the verb, giving us: le fermier en produit.

Why does grand come before champ?

Most adjectives in French go after the noun, but short, common adjectives describing Beauty, Age, Number, Goodness, and Size (often memorized as BANGS adjectives) go before it. Because grand describes size, it is placed before champ.

Why do we say du blé instead of just blé?

In English, we can just say "produces wheat", but French almost always requires an article before nouns. Because wheat is an uncountable mass, we use the partitive article du (which translates to "some"). Du is used here because blé is a masculine word.

If the farmer were a woman, would son grand champ change to sa grand champ?