different stations. The term "seasonal" refers to the 6-month 
period from April to September, inclusive, during which time climatic 
condition- have an immediate effect on the growing plant. Very 
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lonthly precipitation at the eight Qeld stations where sorghum experiments were con- 
ducted. 
few of the plats were seeded before May 15, but rains coming between 
April I and the date of seeding supply much of the soil moisture 
necessary for germinal ion and early growth. 
