. 135 - 1 I I I I 50 100 150 200 250 Weight of roots (g/m-) Figure 2.—Vertical distribution of total root mass. The short vertical lines are interpolated values for layers not sampled in 1965-1966. The curve is an approx- imation of minimum root mass distribution at depths greater than cm.^ not sampled in 1970. 11

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