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• w <br /> <br />Pure live seed (PLS) is the best measure of seed quality. Trash and <br />seed that will not germinate are of no value in obtaining a stand. To <br />determine the pure live seed in a lot of seed, use the following formulas: <br />Y. Pure Live Seed = % Germination* x % Pur <br />100 <br />When computing, change the percent figure to decimal fraction, i.e., <br />87.6X = .876 <br />The value of different seed lots can be compared by the following <br />formula: <br />Price per pound =Actual cost per 16. of PLS <br />PLS (decimal) <br />Number of lbs. to _ seedlings desired per sq. ft. x 43,560 <br />plant per acre PLS x expected field x No. seeds/16. <br />** <br />emergence <br />EXAMPLE: Russian wildryegrass (175,000 seeds/lb.); 95Y. purity; 87.6% <br />germination; desire 10 seedlings/square foot; priced at $0.55 <br />per pound. <br />1. PLS: .95 x .876 = .832 or 83.2% <br />2. Actual cost per lb. of PLS: .55 = $0.66 <br />.832 <br />3. Number of lbs. to _ 10 x 43,560 <br />plant per acre .832 x .52 x 175,000 = 5.75 lbs./A <br />*For legumes, use germination plus hard seed <br />**Expected field emergence for small seeded legumes and grasses: <br />52X (.52), if laboratory germination is more than 80Y.; <br />33X (.33), if laboratory germination is 60 to 80%. <br />P.S. 3 <br />