Calculating fertilizer injector runtime?

Bluelude1

LawnSite Member
Location
Dallas, TX
This is a fringe question if there ever was one ;)...If you were injecting fertilizer into an irrigation system and you knew the following

PPM of Nitrogen in fertilizer stock tank
Injection ratio (1:500 - 1:40)
Zone flow rate
Zone precipitation rate (matched)
But you didn't know the exact sqft being irrigated (I guess it could be roughly calculated from flow & precipitation rates) how would you go about determining zone runtime to put out 1lb N/1000sqft at an injection ratio of say 1:100 ?
 

RigglePLC

LawnSite Fanatic
Location
Grand Rapids MI
Assume an area of 1000 sqft.
Apply a tenth of a foot. This is 100 cubic feet.
This equals 750 gallons.
Use the injection ratio of 1 to a 100.
You will inject 7.5 gallons.
You need .13 lbs N per gallon.
That is 130,000 ppm nitrogen.

On the other hand--do your own homework.
 
OP
B

Bluelude1

LawnSite Member
Location
Dallas, TX
Assume an area of 1000 sqft.
Apply a tenth of a foot. This is 100 cubic feet.
This equals 750 gallons.
Use the injection ratio of 1 to a 100.
You will inject 7.5 gallons.
You need .13 lbs N per gallon.
That is 130,000 ppm nitrogen.

On the other hand--do your own homework.
Thanks for breaking it down. I haven't found an article yet that was as concise.
 

Top