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2 - Math Question Toplef102 - Math Question 1zd3ho10

Hello Guest!
Welcome to the official Square Foot Gardening Forum.
There's lots to learn here by reading as a guest. However, if you become a member (it's free, ad free and spam-free) you'll have access to our large vermiculite databases, our seed exchange spreadsheets, Mel's Mix calculator, and many more members' pictures in the Gallery. Enjoy.

2 - Math Question I22gcj102 - Math Question 14dhcg10

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Math Question

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Post  sanderson 6/4/2018, 1:32 am

This is for those who like math.

Question #1:

I have 6.75 cubic feet of homemade compost.  I have 150 sq. ft. that will need 2" of compost in the next few months.  How much compost will I need to make to top all of the 150 squares?

Question #2:

The tumbler holds 80 gallons which results in about half that amount of usable compost. How many batches will I have to make to have enough compost for the above bed amending?

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Post  AtlantaMarie 6/4/2018, 6:51 am

Oh, Sanderson... You're not nice, trying to make me think this early in the morning! And MATH at that.... ;-)
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Post  BlackjackWidow 6/4/2018, 11:30 am

Question #1: 21.25 cubic feet.
    You will need a total of 25 cubic feet for 150 sq ft at 2" depth. Since you already have 6.75 cubic feet, you need an additional 21.25 cubic feet. Calculated using this compost calculator and then double-checked with this more confusing compost calculator

Question #2: 4 batches
     You need 21.25 cubic feet, which is about 137 gallons. Since you're getting about 40 gallons per batch, you'll need 3.425 batches, or a "real world" total of 4 batches. Conversion using this conversion calculator


Please double-check my figures before accepting these answers. I've not had my full pot of coffee yet! 
Thanks for exercise - I love word problems Smile
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Post  donnainzone5 6/4/2018, 1:00 pm

BJW,

Your mathematical total approximates my rule of thumb:

To top off one 4' x 4' requires approximately one cubic foot of compost (1" deep).

There are approximately 10 such beds in this example.  Therefore, 2" would require approximately 21 cubic feet.
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Post  sanderson 6/4/2018, 1:15 pm

hiddenID

I should have added the following information. I am using the conversion value of 8 gallons/cubic foot.

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Post  BlackjackWidow 6/4/2018, 3:28 pm

@sanderson wrote:hiddenID

I should have added the following information.  I am using the conversion value of 8 gallons/cubic foot.

Hmmm. thinking OK, the site I used said 6.25 gallons = 1 cubic foot. Using your conversion doesn't change the amount needed. Thanks SO MUCH for the confirmation, donnainzone5! So... at 8 gals/1 cuft  thinking 21.25 cubic feet = 170 gals. Still at 40 gals/batch... 170 divided by 40 equals 4.25.

So... not much change. Basically, a little more than 4 batches. Or round up to 5 and have 3/4 batch left over. 




I think I have a headache...  uphill and win lol
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Post  donnainzone5 6/4/2018, 4:04 pm

BJW,

Well, I used to be able to count in my sleep.  I should say, count and convert to the values in Thorp's strategy tables.  

If ingredients are labeled by the gallon, it seems the only conversion needed is gallons = ? cubic feet.  

Actually, math was my worst subject, beginning with Algebra.  The basics were simple.   

I hope my rule of thumb is useful here.
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Post  No_Such_Reality 6/4/2018, 7:22 pm

A cubic foot is 7.48 gallon. Rounded 7.5 gal.  Hence 3 five gallon pails give you 2 cubic feet.

at 2 inches deep, each cubic foot covers 6 squares.  150/6 = 25 cubic feet before settling.  25 - 6.75 = 18.25 cubic feet needed.   18.25 × 7.5 = 136.875  gallins. Round to 137 or 140.  140/40 = 3.5 so four batches.
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Post  sanderson 6/5/2018, 2:19 am

And, we have a winner! NoSuchReality cheers

1. 150 squares covered with 2" of compost.. 2" of compost is 1/6th of a cubic foot. 150/6 = 25 cu. ft. needed.

2. I have 6.75 cu. ft. 25.0 - 6.75 = 18.25 cu. ft. need to be made.

3. Using 7.5 as NSR did, 18.25 x 7.5 = 137 gallons need to be made.

4. 137 gallons needed / 40 gallons per batch = 3.425 batches, so 4 batches. pale

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Post  BlackjackWidow 6/6/2018, 9:27 am

Donnain - "count and convert to the values in Thorp's strategy tables" 
I type lol a lot, but this time I literally laughed out loud. Nearly spit coffee on my monitor! 



*couldn't find a way to edit my original post, so I deleted and re-posted. Reason for editing: post to Sanders sounded too sarcastic. Hard to properly show emotions sometimes Smile
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Post  sanderson 6/6/2018, 6:18 pm

I've done that a few times on this Forum!  Razz

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Post  sanderson 7/8/2018, 10:51 pm

Sanderson needs 4 more batches of compost. A brand new one is cooking in the tumbler. How many more batches does Sanderson need to make?

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Post  AtlantaMarie 7/9/2018, 8:11 am

15,323? :-)
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Post  sanderson 7/10/2018, 2:57 am

darn funny Close, or at least it seems that way. rofl

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