6 



BULLETIN 1062, TJ. S. DEPARTMENT OF AGRICULTURE. 



continued on the Linden plat after recording the initial stand. The 

 data at Bedford were taken throughout the growing season and in- 

 clude the harvest results. 



A complete analysis of the field results obtained in this experi- 

 ment is given in Table 3. At Bedford the average reduction in 

 initial stand due to planting starchy ears was 4.26 per cent. The 

 reduction at Linden amounted to 10.21 per cent. The weather con- 

 ditions following the planting of this plat were very unfavorable 

 for germination. Thus, it appears that starchy ears are especially 

 unsatisfactory for seed in districts where weather conditions are 

 likely to make it difficult to secure a good stand. As in the earlier 

 experiments, the difference in stand was maintained throughout the 

 growing season. As the difference between the initial and the final 

 stands is made up of losses sustained through blighting, and prin- 

 cipally through seedling blight, the results indicate that the suscepti- 

 bility of the two groups to such blighting is equal. 



Table 3. — Yields from starchy and from horny disease-free seed of a strain of 

 Reid Yellow Dent corn, planted in alternate rows at Bedford, Ind., in 1920. 





13 



05 

 W 



3 

 w 



03 

 o 



M 



1 



Agronomic data (per cent). 



Yield per 



Group. 



Stand. 



Plant vigor. 



Stalk condition. 



Quality of 

 ears. 



acre 

 (bushels). 



1— 1 



"3 

 a 



£ 



3 



o 



o 



> 



3 



p 



3 

 SP 

 '> 



a 



o 

 CO 



M 



03 



a 



03 



ffl 



a 



'3 



03 

 <D 



a 



IS 

 o 



ft 



■6 



o 

 o 

 O 



3 



"3 



3 

 o 



< 



^ a . 

 •a -2 



<& w 



as o 



W ft 





19 

 17 



80.9 

 83.2 



83.7 

 79.6 



61.8 

 51.6 



17.9 

 20.1 



3.7 

 7.3 



7.2 

 11.4 



44.5 

 45.9 



1.7 

 2.6 



46.7 

 41.0 



29.5 



27.4 



38.43 

 32.09 



40.7 





35.0 







Difference: 





3.7 



4.26 



4.1 



4.84 



10.2 

 16.5 



-2.2 

 -12.6 



3.6 

 97.3 



4.2 

 58.3 



1.4 

 3.14 



.9 

 53.0 



5.7 

 12.2 



-2.1 

 -7.2 



6.34 

 16.41 



5.7 



In favor of horny 





14.0 









Records were taken on the relative vigor of early growth 40 days 

 after the date of planting. At this time the plants averaged 24 

 inches in height. They were classified arbitrarily as vigorous, semi- 

 vigorous, or weak, and records for the entire plat were taken on the 

 same day by one person, thus insuring the maintenance of the same 

 standard of classification. Rows from the horny seed contained 

 larger numbers of strong plants and markedly smaller numbers of 

 weak plants than those from starchy ears. These results are in agree- 

 ment with the studies reported by Hughes, 4 in which he found that 

 horny kernels gave a more rapid early growth than starchy ones. His 

 data covered a period of only 20 days, however, at the end of which 



4 Hughes, H. D. The germination test of seed corn, 

 pp. 305-379, 22 fig.. 1913. 



Iowa Agr. Exp. Sta. Bui. 135, 



