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• Practid Approa~or EBative E & S Control - 88 number of seeds and rhizomes which then become established as parr of the mulching process. BY this same priru-iple, nan native hays and some straw rttaterials can introduce undesirable plants by the same process. G Penentage Germination The effect of a BMP on the germination of seeds is related to its ability to retain moisture in the soil, moderate temperature and provide the optimum environment for breaking the seed coat. Percentage germination can easily be determined by constructing small test plots, 1' x 1', in the laboratory or field, disbursing the same number of seeds on a bare soil, control plot as on the BMP treated plot and measuring the differences in germination over a set period of time. Some information about quality of the seed selected is necessary. The following general description of seed quality and application rates is provided: In general, most seed companies will assign a recommended rate of application for the seeds they sell. When seed is broadcast and lies on the soil surface instead of being covered,(as in the drilling process) the rate of application is usually doubled. However, it is important to establish the quality of the seed by reading the seed tag, which should contain the following information: - Type of seed - Where grown - Lot /t -Net weight - Purity (%) - Crop (%) -Inert material (%) - Weed seed (%) -Germination (%) - When tested - Noxious wends per ib. The quality of seed and thereby the rate of application is quite easily established by determining PLS, or Pure Live Seed. PLS is also used to determine the true cost of seed. PLS is determined by multiplying the germination % x the seed purity % then dividing by 100. For example, if 1001bs of seed has a purity of 954'o and a germination rate of 80 %, then the PLS is 76%: O 1995 IECA