DESCRIPTIONS 
KEYSTONE 38 — Produces large cylindrical ear with 
medium dent. Single ear to a plant, ear produced 
low on stalk. Strong stalk of medium height with 
excellent root system. Lodging and drought re¬ 
sistant. Shows resistance to grasshoppers and root 
worms. Adapted to Missouri, Northern Arkansas, 
Southern Illinois, Kentucky and Tennessee. Re¬ 
commended for soils of average fertility or above. 
Maturity 120-125 days. 
KEYSTONE 40 — A new hybrid released commer¬ 
cially for first time for 1940 planting. Outstanding 
for yield and lodging resistance. Dark green 
color. Large stalk of medium height. High degree 
of resistance to heat, drought and chinch bugs. 
Seed supply limited. Adapted to Southern half of 
Illinois and Missouri, Western Kentucky and 
Ten nessee. Maturity 122-127 days. 
KEYSTONE MISSOURI #8 — Developed and recom¬ 
mended by Missouri Experiment Station. Heavy 
yielder, medium hardness. Mostly one ear per stalk. 
Large stalk and medium to large ear. Seven year 
average of nearly 35% increase in yield over open- 
pollinated. Does well on upland as well as bottom 
soils. Adapted to Missouri, Kentucky, Arkansas, 
Oklahoma and Kansas. State Certified. Maturity 
120-125 days. 
KEYSTONE MISSOURI #47 — Recommended for 
northern two-thirds of Missouri. About 25% of 
stalks produce two ears. Three year average of 
about 40% increase over open-pollinated. Shows 
considerable resistance to heat and drought. Me¬ 
dium sized ears, stalks large and medium height. 
State Certified. Maturity 115-120 days. 
Fig. 7. Keystone Missouri Hybrid 8, Central Missouri 
KEYSTONE ILLINOIS 960 — Recommended for 
Southern Illinois, Missouri, Northern Kentucky, 
Southern Indiana and Southeastern Nebraska. 
This hybrid is perhaps the most widely adapted 
hybrid in present production. Five year average 
shows about 30% increase over open-pollinated. 
Stalks rather tall but strong, medium sized ears and 
excellent root system. Does well on soils of aver¬ 
age fertility or below. Tends toward two-ears 
per stalk. Maturity 112-117 days. 
KEYSTONE U. S. 13 — Recommended for Southern 
Illinois and Missouri. Large ears, medium dent, 
one to a stalk. Large stalk produces ear at con¬ 
venient height. Makes best showing on soils of 
medium to high level of fertility. Drought 
and heat resistant. Previous tests show 
better than 35% increase over open- 
pollinated. Maturity 120-125 days. 
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KEYSTONE 
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KEYSTONE IOWA 13 — Recommended for extreme 
North M issouri. Southwest Missouri, Eastern Kan¬ 
sas and Southern Iowa. Very drought resistant. 
Large, well-dented ears. Very soft in comparison 
to other hybrids. Heavy foliage and abundant 
grain makes this hybrid an excellent corn for en¬ 
silage purposes. Maturity 110-115 days. 
