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categories on the basis of size and color. The largest seedlings approached in size and color those which had been given both N and P and their roots contained nodules about an inch in diameter, and several smaller ones of assorted sizes. The smallest plants were chlorotic in a fashion typical of nitrogen deficiency in many plants with the leaves yellow-green. The roots had several minute nodules but no large ones. The seedlings intermediate in size had nodules about a half inch in diameter and foliage of a pale-green coloration. In Table 3 are given the average dry weights of roots per plant and the distribution of root nodules according to treatment and size class. The appearance of roots bearing nodules is shown in the photograph. Of special interest is the large nodule joining the roots of the two plants. Through careful slicing of this nodule it became apparent that it grew on one plant but enveloped the root of the other. The dry weights showed that plants supplied with N + P had the largest root system and no nodule formation. Of the plants supplied with only P, the ones with the best nodule development produced the most root weight. On wildland soils low in nitrogen it would be well to manage for those species which increase fertility. It appears that western mountain mahogany is capable of improving the nitrogen status of low fertility soils.

Seasonal Variation in Coverage of Selected Grasses and Forbs in Relation to Grazing Intensities in India