EFFECT OF DATE OF SEEDING ON CORN. 3 



The Kansas Agricultural Experiment Station in 1895 and again in 

 1896 made seven seedings of corn at intervals of one week from April 

 18 to May 30. The early seedings were slower in coming up than the 

 later seedings. There were no consistent differences in yield from 

 the seedings of April 18 to May 9, the April seedings yielding highest 

 in some instances and the May seedings in others. The seedings of 

 May 1 and 2, however, gave the highest yields of good ears. Seedings 

 made later than May 9 gave greatly reduced yields. 



The Oklahoma Agricultural Experiment Station in 1 898 made seed- 

 ings at intervals of one week from March 28 to April 25 and a last 

 seeding on May 13. The March 28 seeding gave the greatest yield. 

 The seeding of May 13 outyielded that of April 25; otherwise, the 

 general tendency was for the yields to decrease as the seeding date was 

 delayed. The plants from later seedings matured in less time than 

 those from the early seedings ; a difference of four weeks in the dates 

 of seeding caused only eight days difference in the dates of maturity. 



The Nevada Agricultural Experiment Station in 1894 made seven 

 seedings of corn at intervals of 10 days from April 20 to June 20. The 

 plants from the April 20 seeding required 142 days to mature; those 

 of April 30 required 135 days and those of May 10 only 126 days. 

 Data upon ripening were not recorded in connection with seedings 

 made after May 10. The highest yield of ears was obtained from the 

 April 20 seeding and the highest yield of stalks from the seeding of 

 June 20. A difference of 10 days between the dates of seeding, April 

 20 and April 30, caused only three days' difference in the dates of ripen- 

 ing. A difference of 20 days between the dates of seeding, April 20 

 and May 10, caused but four days' difference in the dates of ripening. 



Seedings of both dent and flint varieties were made by the South 

 Dakota Agricultural Experiment Station at intervals of five days 

 from May 1 to June 10 during 1888, 1889, and 1890. It is concluded 

 from the experiments " that corn may be planted any time after May 

 1 without danger of the seed rotting, but no gain is made in yield or 

 maturity by planting before conditions of soil and atmosphere are 

 right. These conditions usually come between May 10 and 20. Plant- 

 ings made during the first half of May showed no difference in yield 

 or maturity." 



In general, the experiments reviewed indicate that the best yields 

 of grain may be expected from the early seedings and the most rapid 

 development and the greatest growth from the later seedings. 

 Neither the extremely early nor the very late seedings are desirable. 



EXPERIMENTS AT THE ARLINGTON EXPERIMENTAL FARM. 



The investigations reported in this bulletin were begun at the Ar- 

 lington Experimental Farm, Rosslyn, Va., near Washington, D. C, 

 in 1915, and have been continued since that date. They have been 



