CONSERVATION PRACTICES FOR TOBACCO LANDS 



19 



Table 5. — Tobacco crop values produced on 1 -percent-grade ridge 

 rows compared to fat rows with the slope during seasons of 

 favorable and unfavorable rainfall distribution 





Year 



Rainfall 

 during 



tobacco 

 season 



Value of crop per acre 



Increase 



Type of season 



1 -percent 

 grade 

 ridge 



Flat culti- 

 vated with 

 slope 



from ridge 



row per 



acre 



Favorably distributed 

 rainfall 



f 1941 

 J 1942 

 1 1944 

 I 1946 



Inches 



14.61 



15. 36 



10. 34 



7.49 



Dollars 

 \ 518 



Dollars 

 421 



Dollars 



97 



Average 



11. 95 



16. 49 

 20. 61 









Excess rainfall in early 

 season 



/ 1940 

 \ 1945 



} 368 



336 



32 







Average 



18. 55 

 4. 17 









Too dry in last part of 

 season 



1943 



312 



241 



71 







Average value of 

 crop 





446 



371 



75 











Table 6. — Shelled corn yields from corn grown flat compared with 

 corn grown on ridges, Beltsville, Md., 1944 





Corn yield per acre 



Treatment 



Replica- 

 tion 1 



Replica- 

 tion 2 



Replica- 

 tion 3 



Average 



Flat culture 



Bushels 

 50. 4 

 63.4 



Bushels 

 51. 8 

 61. 9 



Bushels 

 39.0 

 62. 6 



Bushels 

 47. 1 



Ridge-row culture 



62. 6 







Difference favoring ridge 

 row '_ 



13.0 



10. 1 



23. 6 



15. 5 



Row-Grade-Slope Relationships 



Where fields are terraced, it is the common practice to use the 

 terraces as guides for crop rows. When crop rows are laid out parallel 

 to either terrace, on land with varying slope the rows fail to maintain 

 the grade of the guide terrace. 



