Næringsmangelen gjør bladspissen gul.

The ending -en is the usual definite singular ending for many masculine/common-gender nouns in Bokmål.

So:

• en næringsmangel = a nutrient deficiency
• næringsmangelen = the nutrient deficiency

and:

• en bladspiss = a leaf tip
• bladspissen = the leaf tip

In Norwegian, the definite article is often attached to the end of the noun instead of being a separate word like the in English.

Because Norwegian usually puts definiteness on the noun itself.

Compare:

• English: the leaf tip
• Norwegian: bladspissen

Here, -en already includes the idea of the, so you do not need a separate article.

This is one of the biggest differences from English.

Yes. Norwegian uses compound nouns very freely.

• næring = nutrition / nutrient
• mangel = lack / deficiency
  → næringsmangel = nutrient deficiency

And:

• blad = leaf
• spiss = tip / point
  → bladspiss = leaf tip

Writing them as one word is normal in Norwegian. English often uses separate words where Norwegian prefers compounds.

Here gjør means makes or causes ... to become.

The pattern is:

X gjør Y + adjective

= X makes Y adjective

So:

• Næringsmangelen gjør bladspissen gul.
• The nutrient deficiency makes the leaf tip yellow.

This is a very common structure in Norwegian.

Other examples:

• Solen gjør rommet varmt. = The sun makes the room warm.
• Malingen gjør veggen hvit. = The paint makes the wall white.

Because gul is describing the result or state of bladspissen after gjør.

So the structure is:

• subject: Næringsmangelen
• verb: gjør
• object: bladspissen
• result adjective / object complement: gul

In English, we do the same thing:

• The deficiency makes the leaf tip yellow.

So gul is not directly before the noun because it is not being used like a yellow leaf tip. Instead, it means makes the leaf tip yellow.

Because gul agrees with bladspissen, which is singular and common gender.

The adjective forms are:

• gul = common gender singular
• gult = neuter singular
• gule = plural / definite contexts

Since bladspissen is a singular common-gender noun, gul is the correct form.

Compare:

• Næringsmangelen gjør bladet gult.
  (bladet = the leaf, neuter singular)

• Næringsmangelen gjør bladene gule.
  (bladene = the leaves, plural)

Because this sentence does not mean the yellow leaf tip. It means the leaf tip becomes yellow because of something.

Compare the two patterns:

• den gule bladspissen = the yellow leaf tip
  Here gul is directly describing the noun.

• gjør bladspissen gul = makes the leaf tip yellow
  Here gul is the result of the action.

So the position of the adjective changes the meaning.

Not if you want the same meaning.

• gjør focuses on the cause:

  • Næringsmangelen gjør bladspissen gul.
  • The nutrient deficiency makes the leaf tip yellow.

• blir focuses on the change itself:

  • Bladspissen blir gul.
  • The leaf tip becomes/is turning yellow.

So gjør and blir are related in meaning, but they are not interchangeable here.

A useful comparison:

• Planten blir gul. = The plant turns yellow.
• Mangelen gjør planten gul. = The deficiency makes the plant yellow.

Because Norwegian main clauses normally follow the V2 rule: the finite verb comes in the second position.

In this sentence:

• Næringsmangelen = first element
• gjør = finite verb in second position

So the word order is completely normal.

If you move another element to the front, the verb still stays second:

• På grunn av næringsmangelen blir bladspissen gul.

This verb-second rule is very important in Norwegian sentence structure.

Grammatically, yes, it is singular: næringsmangelen = the nutrient deficiency.

But in real usage, this can still refer to a condition in a general or scientific sense, not necessarily one single isolated event. Norwegian often uses the singular definite form in this kind of explanatory statement.

So it can sound natural even in a general context, especially in academic, biological, or technical language.

Yes, it is grammatical and natural, especially in a scientific, agricultural, or educational context.

It has a slightly technical tone because of words like næringsmangelen and bladspissen. That is exactly what you would expect in a description of plant symptoms.

A more everyday-style sentence might sometimes be phrased differently, but this version is perfectly good Norwegian.

The indefinite version would be:

En næringsmangel gjør en bladspiss gul.

But this sounds less natural in many contexts, because it suggests a nutrient deficiency and a leaf tip in a more abstract or less specific way.

The original sentence with definite forms:

Næringsmangelen gjør bladspissen gul.

sounds more like a concrete explanation of a known condition and its effect. That is often preferred in textbook or descriptive writing.