452 
Saville, T., 268 
Schaefer, V. J., 316 
Schmidt-Nielsen, K., and _ B. 
Schmidt-Nielsen, 13, 14 
Scirpus holoschoenus, 401 
Scofield, C. S., 56, 283 
Sediment movement, 103-4, 116- 
L/S 
Seed germination, 394-97, 408 
Seely, B. K., 292 
Semple Ace 3877 
Sewage effluent, 269, 325 
Shantz, Fineye92 
Shaw, S. H., 130 
Sheep, grazing area, 378-80 
Short, L. R., 186 
Shotton, F. W., 123, 128, 129 
Siberia, grasshopper area, 384 
Silver iodide (see Precipitation- 
induced) 
Simmondsta chinensts, 415 
Smiths Es) 202 
Social sciences, needed research, 
42, 43, 45, 198, 433 
Socorro conference, 427-35 
Soil, 6, 34°37) 58-59, 403 
conservation program, 230-231 
crust problem, 408 
irrigated, 286-288 
AMONG IRS, O, J=WO, AO, 75 Jip 
needed research, 430-31 
surveys, 36, 41, 392 
Soil Conservation Service, U. S., 
118, 1G6).2265, 2011 
Solar energy, 62-63, 276 
Sorghum vulgare, 359 
- South America, 49 (see also Brazil; 
Andean America; Mesoa- 
merica) 
Southwestern U.S., 11, 16, 21 
climatic indices, 167-70 
irrigation, 191 
native plants for industry, 414- 
5 
INDEX 
salinity, 224, 280-81 
tree-ring studies, 162-65 
use and misuse, 234, 242 
Soviet Union, 35 
Spanish explorers and _ settlers, 
114, 351 
Spilhaus, A., 314 
Stapledon, R. O., 348 
Stebbins, G. L., 348, 349 
Stipa lagascae, 186, 338 
Stipa species, 345, 346, 348, 355 
Sumner, D. C., 356 
Swinback, N. C., 316 
Talbot, M. W., 352 
Tamarix species, 400 
Thal Valley development, 54-56 
Thornthwaite, (Cl WeeaeGeemaa 
95, 121, 141, 143, 154, 158 
Tigris-Euphrates rivers, 47, 49 
Vixeront, 2,515,525 122s 
Tree-ring studies, 51, 162-65 
Arizona, University of, 166 
Tunisia, go-92 
Trichostema lanceolatum, 356 
Trifolium species, 354, 398 
Trifolium hirtum, 60, 353-54 
Trifolium incarnatum, 353 
Trifolium subterraneum, 38, 60, 
336, 353 
Tritium content of water, 33-34 
Triticum aestivum, 350 
Tube wells, 56 
Tunisia, 51-52, 85 
agricultural planning, 86-87 
archaeology, 98, 125 
ecology, 182 
precipitation and runoff, 89-103 
recharge of aquifers, 134 
salinity, 99 
water balance and needs, 94- 
g6, 105-11 
Turesson, G., 347, 348 
