Fertilizer amount·Compound NPK 10-10-10 · 5 m²
Compound NPK 10-10-10
500 g
5 m² · N 10 g/m²
Content 10%

Compound NPK 10-10-10 on 5 m² — 500 g for 10 g/m² of N

To put 10 g/m² of N on 5 m² with Compound NPK 10-10-10, spread 500 g — that is 100 g per m². At 10% content it is simply the 50 g of nutrient you need divided by that figure.

Fertilizer to spread

Urea is only 46% nitrogen, so putting 10 g of N down means spreading 10 ÷ 0.46 = 21.74 g of urea. Multiply instead and you get 4.6 g, a number that looks plausible enough to pass unnoticed. Whenever the content is below 100%, the fertilizer weight is always larger than the nutrient weight — that is the fastest check that you have the division the right way round.

  • N 5 g/m² · 50 g/m²250 g
  • N 10 g/m² · 100 g/m²500 g
  • N 15 g/m² · 150 g/m²750 g
  • N 20 g/m² · 200 g/m²1 kg

Comes along with it

Matching 10 g/m² of N with a 21-17-17 puts the fertilizer at 47.62 g/m², and those 47.62 g carry 8.1 g of P₂O₅ and 8.1 g of K₂O with them. You do not get to choose: once the fertilizer weight is fixed, the other two are dragged along in proportion to their content. That is why one compound bag rarely hits all three targets. The order of work is to match one, then top up or accept the surplus with straight fertilizers.

  • P₂O₅ 10% · 10 g/m²50 gP 21.8 g
  • K₂O 10% · 10 g/m²50 gK 41.5 g
Fertilizer
Compound NPK 10-10-10 (10-10-10)
Area
5 m²
Nutrient matched
N
Content
10%
Nutrient needed
50 g
Per m²
100 g

Nearby cells

Compound NPK 10-10-10
1 kgN 10%
Compound NPK 10-10-10
2 kgN 10%
Compound NPK 10-10-10
5 kgN 10%
Compound NPK 10-10-10
10 kgN 10%

Same fertilizer, other areas

1 m²
100 gN 10%
5 m²
500 gN 10%
10 m²
1 kgN 10%
20 m²
2 kgN 10%
50 m²
5 kgN 10%
100 m²
10 kgN 10%
200 m²
20 kgN 10%
500 m²
50 kgN 10%
1000 m²
100 kgN 10%

Same area, other fertilizers

Urea
108.7 gN 46%
Ammonium sulfate
238.1 gN 21%
Ammonium nitrate
147.1 gN 34%
Calcium nitrate
322.6 gN 15.5%
Diammonium phosphate DAP
108.7 gP₂O₅ 46%
Monoammonium phosphate MAP
96.2 gP₂O₅ 52%
Triple superphosphate TSP
108.7 gP₂O₅ 46%
Potassium chloride MOP
83.3 gK₂O 60%
Potassium sulfate SOP
100 gK₂O 50%
Potassium nitrate
108.7 gK₂O 46%
Monopotassium phosphate MKP
96.2 gP₂O₅ 52%
Compound NPK 21-17-17
238.1 gN 21%
Compound NPK 17-21-17
238.1 gP₂O₅ 21%
Compound NPK 20-20-20
250 gN 20%
Compound NPK 10-10-10
500 gN 10%

Worth knowing

  • Fertilizer to spread = nutrient needed ÷ (content ÷ 100). It is a division, never a multiplication.
  • Nutrient needed = area × target rate, so twice the area means twice the fertilizer.
  • A fertilizer with half the content takes twice as much for the same nutrient — inverse proportion.
  • With a compound, matching one nutrient drags the other two in at their content ratio.

Common questions

Q. How much Compound NPK 10-10-10 goes on 5 m²?

At 10 g/m² of N, 500 g — that is 100 g per m². It is the 50 g of nutrient needed divided by the 10% content.

Q. If I double the target, do I double the fertilizer?

Yes. Target and fertilizer weight are directly proportional — 5 g/m² takes 250 g and 20 g/m² takes 1 kg. Area behaves the same way: twice the area, twice the fertilizer.

Q. What else goes in along with it?

Matching N to the target also puts in P₂O₅ 50 g, K₂O 50 g. That is not a choice — those amounts are dragged in at their content ratio.