BN—29532 
A range scientist at the Central Plains Experimental 
Range, Nunn, Colo., obtains herbage yields. Measure- 
ments of production and estimates of herbage utilization 
are essential in grazing experiments. 
To increase the efficiency and competitiveness of do- 
mestic seed production, we need better information on— 
® Controlling diseases and insects that attack seed 
crops. 
@ Improving germination and purity of chaffy-seeded 
species. 
® Identifying genetic and environmental factors that 
control the amount and time of flowering. 
® Determining factors that limit pollination, includ- 
ing nectar production and quality and attractive- 
ness to insect pollinators. 
® Characterizing varieties and species as to pollen 
production, distribution, and viability. 
® Improving isolation standards for wind- and in- 
sect-pollinated species. 
® Developing effective cultural, management, and 
disease control practices for seed crops. 
@ Finding effective procedures for maintaining and 
restoring the productivity of old seed fields. 
Grasses and legumes are evaluated in terms of animal 
products. Desirable grazing systems vary with species, 
varieties, and mixtures of plants and with classes of live- 
stock, 
© Eliminating contamination when replacing seed 
fields with new varieties of the same species. 
@ Determining the effect of climatic factors on 
genetic changes within varieties. 
Research To Develop Better Grazing 
and Management Systems 
Half of the land in the United States—a _ billion 
acres—is grazing land (pasture and range). In the 
Great Plains, more than half the land is used only for 
In the southeastern States, more than 100 
million acres of woodland and range is used for grazing. 
grazing. 
Better grazing and management systems will result 
in more efficient use of feed resources, increased animal 
Better man- 
agement will reduce deterioration of seeded pasture and 
gains, and improved reproduction rates. 
range and at the same time reduce loss of soil and water. 
In many parts of the United States, returns from prop- 
erly managed seeded pastures compare favorably with 
returns from cultivated crops. 
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