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retard their growth somewhat. During this first year the legumes send their roots deeply into the soil and by the end of the first growing • season are acquiring most of their moisture from deeper in the sail and the competition with the grasses becomes much less. In the second year, the legumes develop a large amount of topgrowth. The moisture they use generally comes from deeper layers in the soil and therefore competition with the grasses reaches a very low level. With that topgrowth comes a definite advantage for the grasses. First, the topgrowth acts as a living shade mulch reducing soil temperatures and evaporation. This greatly aids the development of the grasses. Interspecific competition between legumes and grasses is of little importance while, by the end of the second growing season, the grasses are begining to compete with each other as their root systems interact. • After the second growing season the large topgrowth of the legumes dies and injects a great deal of nitrogen into the upper layers of the sail. This further aids the grasses in the third season as well as re- seeding the site with additional legume seed. This nutrient injection tends to help the grasses in the third year when their development tends to reach a state of temporary maximum. In the fourth year, seed produced by the legumes and the grasses tend to compete once again while the earlier legumes are generally gone and the grasses have became well established. This starts the second stage of the development where the legumes and second generation grasses produce a filling-in of the initial establishment. By the end of the fifth year, second generation grasses have generally filled the gaps present in the first generation grasses and the second generation • legumes inject a considerable amount of additional nitrogen iota the F'AGE 9 OF 14 - EXHIPIT E