Learn Spanish (Latin America): El aserradero recién produjo este tablón.

In many parts of Latin America, recién is used right before a conjugated verb (like the preterite produjo) to mean "just". So, recién produjo translates to "just produced". In Spain, you would more commonly hear acaba de producir for this, since European Spanish usually restricts recién to past participles like recién hecho (freshly made).

Why is the preterite spelled produjo instead of produció?

The verb producir is irregular in the preterite. Verbs ending in -ducir (like traducir or conducir) change their stem to a j in this tense. So, producir becomes produjo (it produced). Notice that it also drops the regular -ió ending and just uses -o.

Does the -dero ending in aserradero have a specific purpose?

Yes! The suffix -dero often indicates a place where a specific action happens. Since aserrar means "to saw", an aserradero is a place where sawing happens—a sawmill. You will also see this pattern in words like lavadero (laundry room, from lavar) or fregadero (kitchen sink, from fregar).