Wij bemesten het tuinperceel.

Wij means we.

In Dutch, wij and we both mean we:

• wij is the fuller, more stressed form
• we is the unstressed form and is very common in everyday speech

So this sentence could also be:

We bemesten het tuinperceel.

That would sound very natural.

Because with wij in the present tense, Dutch often uses the same form as the infinitive.

The verb is bemesten = to fertilize / to manure.

Present tense:

• ik bemest = I fertilize
• jij bemest = you fertilize
• hij/zij bemest = he/she fertilizes
• wij bemesten = we fertilize
• jullie bemesten = you all fertilize
• zij bemesten = they fertilize

So bemesten here is not an infinitive in meaning; it is the correct present-tense form for wij.

Dutch usually uses the simple present for both:

• we fertilize
• we are fertilizing

So Wij bemesten het tuinperceel can mean either:

• We fertilize the garden plot
• We are fertilizing the garden plot

If Dutch wants to emphasize that the action is going on right now, it can use a progressive construction such as:

Wij zijn het tuinperceel aan het bemesten.

But the simple present is very normal.

Het is the definite article for het-words in Dutch.

Dutch nouns usually take either:

• de
• het

The noun tuinperceel is a het-word, so you say:

het tuinperceel

not de tuinperceel.

A useful detail: in compound nouns, the last part usually determines the gender/article.
Here the last part is perceel, and perceel is a het-word, so tuinperceel is also a het-word.

Yes. Dutch normally writes compound nouns as one word.

So:

• tuin = garden
• perceel = plot, parcel, piece of land
• tuinperceel = garden plot / garden parcel

English often separates these words, but Dutch usually joins them together.

Tuinperceel means a specific plot of land used as a garden or a garden plot.

It sounds a bit more specific and technical than just tuin:

• tuin = garden
• tuinperceel = a particular plot/parcel of garden land

So this sentence suggests a defined piece of land, not just a garden in a broad sense.

Because Dutch main clauses usually follow the V2 rule: the finite verb comes in the second position.

Here:

• Wij = first position
• bemesten = second position
• het tuinperceel = the rest of the clause

So the structure is:

Subject + finite verb + object

That is very normal Dutch word order in a simple main clause.

Usually, yes. Bemesten is a transitive verb, so you normally fertilize something.

Examples:

• Wij bemesten het tuinperceel.
• Zij bemesten de akker.
• Ik bemest de planten.

So het tuinperceel is the direct object: it is the thing being fertilized.

No. Bemesten is not a separable verb.

The prefix be- is usually inseparable in Dutch. That means the verb stays together:

• Wij bemesten het tuinperceel.
• We hebben het tuinperceel bemest.

You do not split it into something like mesten ... be.

Yes, it is grammatical and natural, especially in a gardening, agricultural, or slightly technical context.

That said, in everyday speech people might also say something simpler, such as:

• We bemesten de tuin. = We fertilize the garden.
• We geven de tuin mest. = We give the garden fertilizer/manure.

So Wij bemesten het tuinperceel is correct, but it sounds a bit more specific because of tuinperceel.

A rough pronunciation guide:

• Wij sounds roughly like English why
• bemesten sounds roughly like buh-MES-tuh(n)
• het is roughly het with a short e
• tuinperceel is the trickiest part; tuin contains the Dutch ui sound, which does not exist in standard English

Very approximate full pronunciation:

Why buh-MES-tuh(n) hut TOWYN-per-SAIL

That is only approximate, especially for ui in tuin, but it may help as a first step.