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Physiological characteristics of the cool - season and warm- season grasses can be used to <br />influence their germination and establishment composition. Variations in timing of fall <br />and spring planting periods may be required to obtain desired vegetation cover results. <br />For these reasons calendar dates for seeding and planting operations are not specified. <br />Planting operations should be conducted during the indicated seasons based on site - <br />specific needs, moisture regimes and vegetation purposes. <br />Generally, soil moisture conditions in the fall allow for better equipment access than <br />those present in the spring. Planting in the early fall usually promotes the <br />establishment of cool - season grass species, since they experience two favorable <br />germination and growth periods prior to warm - season germination. The need to <br />promote the establishment of warm - season grasses may require that the rangeland seed <br />mixture be planted later in the spring, which reduces cool- season grass competition by <br />allowing warm- season species to germinate and establish prior to the first cool- season <br />grass growth period in the fall. <br />Plantings undertaken outside of these generally accepted time periods may not be <br />successfully completed, particularly in the winter when inclement weather can <br />physically preclude seeding operations. Success of seeding undertaken during the <br />summer months can be highly variable, depending upon the length of time between <br />precipitation events and the amounts of precipitation received. Summer hailstorms <br />may also influence survival of seedlings. None - the -less, under certain circumstances <br />some areas may require seeding immediately following disturbance or construction <br />activities. In these situations exceptions may be made to the standard planting periods. <br />SEEDING METHODS <br />Seed mixtures may be planted using either broadcast or drill seeding methods. Key to <br />the success of planting operations is proper preparation of the seedbed. The seedbed <br />Appendix G 11 07/01/02 <br />