- sequence of 3 numbers on the fertilizer label that gives the percent
of N-P205-K20 in a fertilizer; required
by law to be on the label of every fertilizer sold.
8-8-8 means the fertilizer contains:
24% total nutrient content
Buy fertilizers by price per pound of fertilizer, not price per bag.
lb. of 8-8-8 @ $4.99
100 lb. @ 24% = 24 lb. of
@ $4.99 = 20.8
cents per lb
lb. of 13-13-13 @ $5.99
100 lb @ 39% = 39 lb. of
@ $5.99 = 15.3
cents per lb.
- the relative proportion of N to P205 to K20
in a fertilizer.
FERTILIZER RATIOS TO MANIPULATE PLANT GROWTH
favor vegetative growth
favor flowering, root and underground storage organ growth
use a high N, low P and K fertilizer
for example, use a 2-1-1 or
3-1-1 ratio fertilizer (higher 1st number)
use a low N, high P and/or K
for example, use a 1-2-2 or
1-3-2 ratio fertilizer (higher 2nd and/or 3rd number)