Fertilizer amount·Monoammonium phosphate MAP · 10 m²
Monoammonium phosphate MAP
192.3 g
10 m² · P₂O₅ 10 g/m²
Content 52%

Monoammonium phosphate MAP on 10 m² — 192.3 g for 10 g/m² of P₂O₅

To put 10 g/m² of P₂O₅ on 10 m² with Monoammonium phosphate MAP, spread 192.3 g — that is 19.23 g per m². At 52% content it is simply the 100 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.

  • P₂O₅ 5 g/m² · 9.62 g/m²96.2 g
  • P₂O₅ 10 g/m² · 19.23 g/m²192.3 g
  • P₂O₅ 15 g/m² · 28.85 g/m²288.5 g
  • P₂O₅ 20 g/m² · 38.46 g/m²384.6 g

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.

  • N 11% · 2.12 g/m²21.2 gN 21.2 g
Fertilizer
Monoammonium phosphate MAP (11-52-0)
Area
10 m²
Nutrient matched
P₂O₅
Content
52%
Nutrient needed
100 g
Per m²
19.23 g

Nearby cells

Monoammonium phosphate MAP
384.6 gP₂O₅ 52%
Monoammonium phosphate MAP
961.5 gP₂O₅ 52%
Monoammonium phosphate MAP
1.92 kgP₂O₅ 52%
Monoammonium phosphate MAP
3.85 kgP₂O₅ 52%

Same fertilizer, other areas

1 m²
19.2 gP₂O₅ 52%
5 m²
96.2 gP₂O₅ 52%
10 m²
192.3 gP₂O₅ 52%
20 m²
384.6 gP₂O₅ 52%
50 m²
961.5 gP₂O₅ 52%
100 m²
1.92 kgP₂O₅ 52%
200 m²
3.85 kgP₂O₅ 52%
500 m²
9.62 kgP₂O₅ 52%
1000 m²
19.23 kgP₂O₅ 52%

Same area, other fertilizers

Urea
217.4 gN 46%
Ammonium sulfate
476.2 gN 21%
Ammonium nitrate
294.1 gN 34%
Calcium nitrate
645.2 gN 15.5%
Diammonium phosphate DAP
217.4 gP₂O₅ 46%
Monoammonium phosphate MAP
192.3 gP₂O₅ 52%
Triple superphosphate TSP
217.4 gP₂O₅ 46%
Potassium chloride MOP
166.7 gK₂O 60%
Potassium sulfate SOP
200 gK₂O 50%
Potassium nitrate
217.4 gK₂O 46%
Monopotassium phosphate MKP
192.3 gP₂O₅ 52%
Compound NPK 21-17-17
476.2 gN 21%
Compound NPK 17-21-17
476.2 gP₂O₅ 21%
Compound NPK 20-20-20
500 gN 20%
Compound NPK 10-10-10
1 kgN 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 Monoammonium phosphate MAP goes on 10 m²?

At 10 g/m² of P₂O₅, 192.3 g — that is 19.23 g per m². It is the 100 g of nutrient needed divided by the 52% content.

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

Yes. Target and fertilizer weight are directly proportional — 5 g/m² takes 96.2 g and 20 g/m² takes 384.6 g. Area behaves the same way: twice the area, twice the fertilizer.

Q. What else goes in along with it?

Matching P₂O₅ to the target also puts in N 21.2 g. That is not a choice — those amounts are dragged in at their content ratio.