PURE LIVE SEED
A bag of seed consists of inert material such as dust, chaff, and empty seed;
weed and other crop seed; and Pure Live Seed (PLS) of the desired species. Since
every seed lot has a different analysis, a formula has been devised which allows
customers to pay for only the pure, live seed in a bag. To figure the Pure Live
Seed percentage, multiply the purity percentage by the germination percentage of
the seed lot. By then multiplying the Pure Live Seed percentage by the weight of
the bag, one can determine the amount of pure live seed in the bag. Let us
compare two lots of seed to determine the best value:
Lot A is labeled 98% pure with a 95% germination and costs $5.00 per
bulk pound.
Lot B is labeled 89% pure with a germination of 92% and costs $ 4.75
per bulk pound.
Lot A: .98 x .95 = .931 PLS
Lot B: .89 x .92 = .819 PLS
Now divide the seed cost by the PLS percentage to determine the Pure
Live Seed cost:
Lot A: $5.00 / .931 = $5.37 per PLS pound
Lot B: $4.75 / .819 = $5.80 per PLS pound
As you can see, the seed lot which was less expensive on a bulk seed basis
actually represents an inferior value on a PLS basis. In order for a purchaser
to adequately evaluate seed value, Pure Live Seed prices must be determined
before seed is purchased.
Seeds with higher purity and germination rates tend to have more vigorous,
healthy seed than seed with lower PLS values. Also, higher quality seed costs
less to ship; let's see how many pounds of seed would be shipped if one ordered
1000 PLS pounds:
Lot A: 1000 / .931 = 1074 bulk pounds
Lot B: 1000 / .819 = 1221 bulk pounds
Stretch your dollar and get
better quality
Ask for PLS pricing!
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COMPANY
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River Seed 2009–2019 
