EFFECT OF DATE OF SEEDING ON CORN. 



11 



Table 5. — Differences in the time of emergence and in the silking of corn seeded on early 

 and normal dates at the Arlington Experimental Farm, near Washington, D. C, in 

 1917, 1919, and 1920. 



Variety. 



Number of days difference in- 



Dates of seedings. 



Seedings. 



Emer- 

 gence. 



Appear- 

 ance of 

 first silks. 



Season of 1917: 



Northwestern 



U. S. Selection 133 



Early Huron 



Rocky Mountain Dent . 



100-Day Bristol 



U. S. Selection 119 



Season of 1919: 



White Ree 



U. S. Selection 133 



U. S. Selection 193 



U. S. Selection 119 



White Ree 



U. S. Selection 133 



U. S. Selection 193 



U. S. Selection 119 



White Ree 



U. S. Selection 133 



XL S. Selection 193 



U. S. Selection 119 



White Ree 



TJ. S. Selection 133 



U. S. Selection 193 



U. S. Selection 119 



Season of 1920: 



U. S. Selection 133 



TJ. S. Selection 119 



Apr. 12 and May 14. 



do 



do 



do 



do 



do 



Apr. 9and30 



do 



do 



do 



Apr. 9 and May 14. . . 



do 



do 



do 



Apr. 30 and May 14. 



do 



do 



do 



Apr. 21 and May 14. 



do 



do , 



do 



Apr. 20 and May 7 . 

 do 



SUMMARY. 



The results of the experiments at the Arlington Experimental 

 Farm ; near Washington, D. C, are as follows: 



(1) The germination of corn increased in rapidity as the date of seeding occurred 

 later. 



(2) The total growth of stalk was greatest from the seedings in June and May. The 

 rate of growth was most rapid from the June and July seedings. The total growth -was 

 least and rate of growth slowest from the April seedings. 



(3) Development was more rapid in the later than in the earlier seedings. 



(4) The number of ears per stalk, the size of the ear, and the amount of suckering 

 bore no consistent relation to the date of seeding. 



(5) The pollen-shedding period was longer in plants from the early seedings than 

 those from the later seedings. 



(6) Seedings earlier than normal resulted in slight gains in the date of silking. 



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