mi? 
Chaining is one of several methods used to control undesirable brush on rangelands. 
TEX-49991 
Areas subjected to either 
mechanical or herbicidal treatments must often be seeded to restore the grass cover. 
Competition among plants for light, moisture, and 
nutrients. 
@ Nutrient requirements of various species and 
varieties of grasses and legumes. 
@ Nature of tolerance to temperature extremes, in- 
cluding diurnal fluctuations. 
® Efficiency of photosynthesis in relation to location 
and age of leaves. 
@ Effect of day length, light quality, and light in- 
tensity on forage and seed yields. 
® Storage, location, and form of reserve carbo- 
hydrates. 
® Relationship of leaf area, reserve carbohydrates, 
and other variables to-regrowth following grazing 
or clipping. 
® Energy requirements for the synthesis of carbo- 
hydrates, fats, protein, and nucleic acid. 
® Action of subcellular particles in protein synthesis. 
@ Effect of environment on biologically active 
constituents. 
Research on Seeding Methods 
In most areas, methods for seeding grasses and leg- 
umes are based either on farm practice or on limited 
tests. Although these methods have much to commend 
them, seeding failures occur too frequently in both 
arid and humid regions. In arid regions, better seed- 
ing methods will reduce seeding failures of forages 
used for revegetation; in humid regions, better methods 
will increase the use of forages in rotations on culti- 
vated land. Basic research information accumulated 
from problem sites will have broad application in 
improving seeding methods. 
To improve methods of seeding forages, we need 
more knowledge on— 
® Development of instruments for measuring plant 
response. 
® Microclimatic relationships on problem sites. 
®@ Germination of forages under various stress condi- 
tions. 
