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Grittyville, WA

1000 ft patch has about 50000 lbs of soil in the top 8 inches. This is 20x less than 1000000 lbs. If i want to add, say, 100 ppm (parts and pounds is now the same) to a mass that is 1/20 of a million lbs i would multiply by 1/20 so this would be five pounds. Sound about right? "Parts" I believe is an actual comparison of weight of substance not a ratios of numbers of molecules. So parts is more like partitions not individual components.

The long and short of it is, can i divide the ppm i want to add by about twenty and get the lbs of pure substance per 1000 Sq ft to add?

In the example above if I wanted to raise my nitrogen by 100 ppm I could do that with 50 lbs of 10-20-20?

Great soil texture but the un-amended dirt tests at less than 5 ppm nitrogen here in Glenoma.

If I'm off track please help me! Thanks.

7/3/2017 4:55:43 AM

Central Illinois

something like this ?
1 cubic ft = 0.0283168 cubic meter

Volumn = 1,000 cubic ft x 0.0283 cubic meter/1 cubic ft
Volumn = 28.3 cubic meters

multiply by the density to get weigh
convert soil density to kg/cubic m
Soil density = 1,100 kg/ cubic meters

Weight = 28.3 cubic meters x 1,100 kg/cubic meters
Weigh = 28,200 kg (this is how much the soil in our 1,000 sq ft patch weights [which is 62,390 lbs])

one part per million is 1 millionth of that weigh
1 ppm = 28,200 /1,000,000 = 0.0282 kg
df0.0282 kg = 28.2 g

So for Manganese Sulfate (32%)
yes divide 28.2 g / 0.32 = 88.2 grams

So you would add 88.2 grams of Manganese Sulfate to your 1,000 sq ft patch to increase 1 ppm.

7/3/2017 8:56:31 AM

Chesapeake City, MD

Without doing the math, 50lbs of 10-20-20 is a lot of fert to put on 1000 sq feet.
Also consider that unless you tilling it in, the first inch will be much more concentrated than the 8th inch.
Lastly, if you are trying to increase only nitrogen and you want to put down granular, why not use urea?

7/3/2017 9:51:34 AM

Grittyville, WA

baitman thanks for the example that looks right.

Thats what I thought too about it being a lot of fertilizer. But the area in question is so poor it won't grow grass anymore and certainly not a pumpkin it's been grazed by cattle down to nothing. Thanks guys

7/3/2017 5:54:54 PM

Central Illinois

I added 1/4 cup of 21-0-0 to my irrigation water over 1000sqft it made a difference, I am glad I didnt use any more than that they look great

7/4/2017 8:20:26 AM

Grittyville, WA

I hear ya. The foliar feeding is a different story because it really goes straight into the plant. Not much needed. Maybe more cost effective...

7/8/2017 2:55:06 AM

Central Illinois

I just had a tissue test done and Ron Wallace advised me to just soil feed, but everyone's different

7/8/2017 8:27:25 AM

Grittyville, WA

Oh not sure if u meant the water was going in the ground or on the plants.... Drip or overhead...

7/13/2017 2:51:49 PM