The vegetable man , want to set pumpkins in a small garden plow 25 ft broad and 25 ft long . This means he has a 25 ft X 25ft=625 sq ft to fertilize . The vegetable world now call the pumpkin man checkthe chartand from previous experience of lifelike loss , that he needs about 1.5 kg of nitrogen and 0.5 kilo of phosphorus per 100 m straightforward ( 3 pound N/100 sq ft and 1 lb P/1000 sq ft ) .
extra K is seldom required , but its degree should be curb periodically with a ground test . Very flaxen areas and peaty or mellow organic areas are exceptions in that soils in their areas are often deficient in atomic number 19 .
The pumpkin man soil is silt loam with an first-class supply of constitutional issue , does not require additional K at this prison term .
The right way to count the amount of fertilizer to apply is to divide the turn of kilo or pound of nutrient required in 100 m squared or 1000 sq ft y portion of nutrient in the plant food .
Since the pumpkin man land is slenderly basic ( high-pitched PH , he wants to use mono ammonium phosphate 11.55 - 0 and ammonium ion sulfate 21 - 00 - 00 which are both acidic in nature . The pumpkin man starts by calculating how much phosphorus to lend oneself .
1 lb of phosphrous required 1.0———————————- = — — = 1.8 lbs of 11 - 55 - 0 per 1000 sq ft55%/100 0.55
Since the plant food 11 - 55 - 00 also supply some nitrogen , the pumpkin homo needs to make love how much factual N is in the 1.8 lbs will be hold . He does this by multiplying(instead of dividing ) the weight of atomic number 7 involve by the per centum of nitrogen in the 11 - 55 - 0 .
1.8 lb of 11 - 55 - 0 X 11%/100=1.8 X0.11=0.2 lbs of N per 1000sq feet ..
The pumpkin man wants to practice a total of 3 lb of nitrogen per 1000 sq ft . Therefore , he must subtract the amount of nitrogen being applied in the 11 - 55 - 00 .
3.0 lb – 0.2 lbs=2.8 lbs of nitrogen still needed ..
Now he can cypher how much 21 - 0 - 0 to hold ..
2.8 lbs of atomic number 7 require 2.8 — — — — — — — — — — — – = — – = 13.3 pound of 21 - 0 - 0/1000 sq ft21%/100 0.21
But the pumpkin man garden in not 1000 sq ft so less fertilizer is require to bring nutrients back up to optimum level . To calculate the right amounts of fertilizer , he separate the exercising weight by 1000 sq ft and multiplies by his true expanse of 625 foot ..
1.8 lb of 11 - 55 - 0 — — — — — — — X 625 sq ft = 1.2 lb of 11 - 55 - 01000sq foot
13.3 lbs of 21 - 0 - 0———————- X 625 sq ft = 8.3 lbs of 21 - 00 - 001000 sq ft
All fertilizers should be apply as accurately as possible . Use a weighting scale or a measuring cupful to value the fertiliser . It takes approximately 2.5 cups to measure a quid . The pumpkin valet de chambre knew mass would grizzle that he did not discuss constitutional fertilizer alternatively . So … one day he ensure house manure on sale at one of the garden centers . Its analysis i d 0.6 % N -0.2%P – 0.6%K. To compare this fertiliser , he calculated the following ..
3 quid of N 3 — — — — — – = — = 500 lbs of manure per 1000 sq ft.0.6 % / 100 .006
500 lbs / 1000 sq ft X 625 sq ft=312 pounds of manure for the garden ..
Cost for this amount of manure are humankind times smashing than the chemical equivalent weight . Moreover , the manure is much Smore difficult to apply and incorporate .
