1
Q
Calculating fertilizer by area
A
- Find total sf of space
- Find weight of N in one bag, given as percent (must know weight of bag)
- Calculate how much area one bag would cover
- Divide size of area by amount one bag would cover
2
Q
How many lbs of N would a 40lb bag of 20-20-20 have?
A
.2x40=8 lbs
3
Q
golden rule for fertilizer
A
1 lb N/ 1,000 sf
4
Q
How much area would a 40lb bag of 20-20-20 cover?
A
- 0.2x40=8 lbs N
- 8x1000=8000 sqft
5
Q
How many 40 lb bags of 20-20-20 would cover 25,000 sqft?
A
- 0.2x40= 8 lbs N
- 8x1000= 8,000 sf
- 25,000 sf/8,000 sf= 3.125 bags
6
Q
how many sqft are in 1 acre?
A
43,560 sf
7
Q
Standard fertilizer concentration
A
200ppm
8
Q
Low rate fertilizer concentration
A
(for winter)
100ppm
9
Q
max rate fertilizer concentration
A
300-400ppm
to push growth
10
Q
Benefits of controlled-release fertilizer
A
-easy to use
-reduced application time
-reduced environmental impact
11
Q
Disadvantages of controlled-release fertilizer
A
-lack of flexibility
-storage limitations
12
Q
Hose on ratio
A
1:15
Gardener Test
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Decks in class (12)
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