AGRONOMY / 83
KILLINGER, G. B.; MOTT, G. O.; NORDEN, A. J.; PFAHLER, P. L.; POPENOE,
H. L.; PRINE, G. M.; RODGERS, E. G.; RUELKE, O. C.; SCHANK, S. C.;
SCHRODER, V. N.; SMITH, R. L.; STANLEY, R. G.; WARMKE, H. E.; WEST,
S. H.; WHITTY, E. B.; WILCOX, M.

Graduate Coordinator: E. G. RODGERS
 The Department of Agronomy offers major work for the degrees of Master
of Agriculture, Master of Science in Agriculture, and Doctor of Philosophy.
Areas of specialization are crop ecology, crop nutrition and physiology,
forages and pastures, weed science, cytogenetics, genetics, and plant breeding.
Prerequisites include a background in science, with basic courses in mathe-
matics, chemistry, physics, botany, and bacteriology. Minor work is offered
students taking major work in other departments. Students wishing to take
major or minor work in agronomy should consult the department chairman or
graduate coordinator.

COURSES FOR ADVANCED UNDERGRADUATES AND GRADUATES
AY 505-RICE. 4 credits
AY 509-SUOARCANE. 4 credits
AY 513-OILSEED CROPS. 4 credits
AY 514-FIBER CROPS. 4 credits
AY 536-TROPICAL PASTURE AND FORAGE SCIENCE. 5 credits

 GRADUATE COURSES
AY 641-CROP NUTRITION. 4 credits
 Prerequisite: BTY 310. Nutritional influences on differentiation, composition,
growth, and yield of agronomic plants.
AY 642-BIOCHEMISTRY OF HERBICIDES. 4 credits
 Prerequisite: CY 565. Mechanism of action, metabolism, and structure-activity
relationships of herbicides.
AY 644-PHYSIOLOGY OF AGRONOMIC PLANTS. 4 credits
 Prerequisite: BTY 515. Yield potentials of crops as influenced by photosynthetic
efficiencies, respiration, translocation, drought, and canopy architecture.
AY 646-CROP ECOLOGY. 5 credits
 Prerequisite: AY 311, AY 432, or BTY 501. Influence and interaction of en-
vironmental factors, such as climatic, edaphic, pyric, and biotic, on the development
and distribution of crop plants.
AY 647-CROP PLANTS IN TROPICAL ENVIRONMENTS. 12 credits
 Prerequisite: Approval by Organization for Tropical Studies. Factors determining
growth, development, and production of crop plants in tropical environments.
AY 658-POPULATION GENETICS. 3 credits
 Prerequisites: AY 362, STA 520. Application of statistical principles to biologi-
cal populations in relation to gene frequency, zygotic frequency, mating systems,
and the effects of selection, mutation, and migration on equilibrium populations.
AY 660-CYTOGENETICS. 5 credits
 Prerequisites: Basic courses in genetics and cytology. Genetic variability with
emphasis on interrelationships of cytologic and genetic concepts. Chromosome