SCS-80903 
Millions of acres of unproductive grasslands could be improved by a better combination of livestock management 
and seeding to species that will tolerate heavy grazing and drought. 
from diseases and insects. We need varieties that are 
tolerant or resistant to drought and extreme tempera- 
tures. And we need forages that will do more to stabi- 
lize and restore lands where production is now limited 
by excessive erosion, low fertility, and salinity. 
To develop varieties that are tolerant or resistant to 
environmental hazards, more information is needed 
on— 
© Improving techniques for measuring drought 
resistance. 
© Finding better procedures for evaluating toler- 
ances to low and high temperatures. 
® Determining resistance of species and varieties to 
saline conditions. 
® Measuring grazing tolerance and proper season 
of use as related to persistence. 
® Identifying morphological and anatomical char- 
acteristics associated with resistance and suscepti- 
bility. 
® Establishing the association between seeding and 
mature plant behavior. 
@ Isolating species that have promise for use on 
difficult sites. 
® Selecting varieties with improved adaptation to 
environmental hazards. 
BN—29541 
Information on the adapted characteristics of species, 
varieties, and experimental selections is obtained from 
field experiments. Here, a geneticist plants a clover test 
in Colorado. 
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