Tukey, H. B., Jr. 
1966. Leaching of metabolites from above-ground 
plant parts and its implications. Bull. Tor- 
rey Bot. Club 93: 885-401. 
and Morgan, J. V. 
1963. Injury to foliage and its effect upon the leach- 
ing of nutrients from above-ground plant 
parts. Physiol. Plant. 16: 557-564. 
VanDiest, A. 
1962. Effects of soil aeration and compaction upon 
yield, nutrient takeup and variability in a 
greenhouse fertility experiment. Agron. J. 
54: 515-518. 
VanDyne, George M. 
1965. Chemical composition and _ digestibility of 
plants from annual range and from pure- 
stand plots. J. Range Manage. 18: 332-339. 
and Heady, H. F. 
1965a. Botanical composition of sheep and cattle diets 
on a mature annual range. Hilgardia 36: 
465-492. 
and Heady, H. F. 
1965b. Dietary chemical composition of cattle and 
sheep grazing in common on a dry annual 
range. J. Range Manage. 18: 78-86. 
Watkins, J. M. 
1940. The growth habits and chemical composition 
of bromegrass, Bromus inermis Leyss., as af- 
fected by different environmental conditions. 
J. Amer. Soe. Agron. 32: 527-538. 
Watkins, W. E. 
1937. The calcium and phosphorus contents of im- 
portant New Mexico range forages. N. Mex. 
Agr. Exp. Sta. Bull. 246, 75 pp. 
1943. Composition of range grasses and browse at 
varying stages of maturity. N. Mex. Agr. 
Exp. Sta. Tech. Bull. 311, 43 pp. 
Weir, W. C., and Torell, D. T. 
1959. Selective grazing by sheep as shown by a com- 
parison of the chemical composition of 
range and pasture forage obtained by hand 
clipping and that collected by esophageal- 
fistulated sheep. J. Anim. Sci. 18: 641-649. 
Welton, F. A.,and Morris, V. H. 
1928. Woodland pasture. J. Forest. 26: 794-796. 
Whitehead, D. C. 
1966. Nutrient minerals in grassland herbage. Hur- 
ley, Berkshire, United Kingdom: Common- 
wealth Bur. Pastures and Field Crops, Mim- 
eogr. Publication 1, 83 pp. 
Whitman, W. C., Bolin, D. W., Klosterman, E. W., and 
others. 
1951. Carotene, protein, and phosphorus in range 
and tame grasses of western North Dakota. 
N. Dak. Agr. Exp. Sta. Bull. 370. 
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