How do you accurately calculate mound size

_tessarecting

ஓ

• Jan 29, 2017

• #1

I know I dumped roughly 2 yards of soil onto each approximately 100 gallon hole. Last year I estimated the amount to be 500 gallons @ each site

They're roughly 6'x6' and 18 inches deep from the hole.

Am I right in assuming the approximate sq ft of each mound to be 22.5 or am I missing something here?

 

Avenger

Well-known member

Veteran

• Jan 29, 2017

• #2

6' x 6' = 36 square feet

18 inches= 1.5 feet

6' x 6' x 1.5' = 54 cubic feet

3' x'3' x 3' = 27 cubic feet or one cubic yard


54 cubic feet = 2 cubic yards

 

_tessarecting

ஓ

• Jan 29, 2017

• #3

I understand cubic feet that makes way more sense what I dont understand is why I am being given amendments in sq ft if they need to be applied in cubic ft. Is there some trick here that I am missing,

the other option is lbs to acre and that is even more confusing

edit so I just found this

1 lb./acre 1 ounce/605 sq. yd

Even this is squared though

 

_tessarecting

ஓ

• Jan 29, 2017

• #4

I know my bulk density is 40% from weighing it wet and dry last year. http://www.soilquality.org.au/factsheets/bulk-density-measurement

Can anyone help me find the missing link here in layman terms, how I can take amendment recommendations for either sq ft or #'s to acre and apply that to my mound size and bd

I assume you just divide the number by 40% but how that is applied is where I am lost

 

Avenger

Well-known member

Veteran

• Jan 30, 2017

• #5

My Assumption, not having access to ask the actual lab that gave the recommendations, is that they are referring to an acre furrow slice of soil. This is a volume of soil that is equal to one acre in area by 6.7" deep or 24,394 cubic feet of soil(903.59 cubic yards).

The lab assumes that an acre furrow slice weighs 2 million pounds(1.33 grams per cubic cm), so to get pounds per acre, they simply multiple their ppm results from the extractions by two and call it pounds per acre.

but I assume you know what assuming does for us, right?

http://plantscience.psu.edu/research/centers/turf/extension/factsheets/acre-furrow-slice

 

_tessarecting

ஓ

• Jan 30, 2017

• #6

Right thanks I hear you on not making assumptions its hard for someone who doesnt have a mathematical mind.

Was I right about the bulk density division of cutting amendment numbers by 40% based off of wet/dry weight?

 

_tessarecting

ஓ

• Jan 31, 2017

• #7

If you're given recommendations for spectrum analysis at cec 16 and a 12" depth

Where does bulk density factor into rx amount? Do you cut the numbers by 40%?

Edit https://www.icmag.com/ic/showpost.php?p=7407412&postcount=327
Thats what leadsled does so that's what I'm going to do