434 
Climatic: 
1. Character of season as to rainfall, temperature, etc. 
available in the Weather Bureau records. ) 
Edaphic: 
2. Character of soil. 
3. Preparation of soil. 
4. Fertilizers. 
5. Cultivations. 
6. Irrigations. 
Experimental: 
7. Size and shape of plots. 
8. Error due to marginal effect. 
GENETICS IN RELATION TO AGRICULTURE 
(These data are usually 
Fia. 181.—Increase plots harvested and ready to thresh. 
60 bu. to the acre. 
9. Method of obtaining yields. 
The plots in this field averaged 
(After Montgomery.) 
10. Percentage of moisture at time of weighing. 
Biological: 
11. 
12. 
13. 
14, 
15. 
16. 
17. 
18. 
19. 
20. 
21. 
22. 
23. 
24, 
Source of seed. 
Viability of seed. 
Preceding crop or crops. 
Date of seeding or planting. 
Rate of seeding or planting. 
Method of seeding or planting. 
Date of appearance above ground. 
Percentage of stand. 
Uniformity of stand. 
Uniformity of growth. 
Percentage of weeds. 
Date of blooming. or heading. 
Date of maturity. 
Variety of plant, including purity and trueness to type. 
Digitized by Microsoft® 
