ANNUAL REPORT, 1936 



Plot Treatment 



Red top cover 



Check (limed) 



Check (no lime) 



Orchard grass cover 



Spinach cover 



Tall meadow oat grass cover 



Italian rye grass cover 



Manure (no cover) 



2d year tobacco after potatoes 



1st year tobacco after 1-year-old orchard grass 



1st year tobacco after 1-year-old timothy sod 



2d year tobacco after manure and 1 -year-old red top 



Tobacco after manure and red top cover. 



1st year tobacco after red top and clover hay, 2-year sod 



1st year tobacco after 2-year-old red top sod 



1st year tobacco after 2-year-old sod of timothy and , 



clover 



1st year tobacco after 2-year-old sod of timothy 



1st year tobacco after 1-year-old sod of red top and clover 



1st year tobacco after 1-year-old sod of red top 



Excellent yields were obtained this past season from plots in which tobacco 

 followed lamb's quarters (Chenopodium album) and pigweed (Amaranthus 

 retroffexus) and from a small plot of electrically sterilized soil. These soils 

 had been cropped previous to this experiment with four successive years of corn. 



In the spring of 1935 one portion of the field was sown with lamb's quarters, 

 another portion with pigweed, and the remainder again planted with corn. In 

 the spring of 1936 the soil of a part of the field where corn had previously grown 

 was electrically sterilized. The soil was removed to a depth of six inches, placed 

 in a box connected with terminals, sterilized at a temperature of 100° C. or 

 above, and replaced in the field when the process was completed. In another 

 part of the field where corn had been grown, mature tobacco plants were left 

 in the field over winter and plowed under in the spring of 1936. 



Tobacco was grown on the field in 1936, with results as follows: 



Average Yield 

 per Acre 

 Pounds 



Tobacco following corn 2,110 



Tobacco following corn (mature tobacco plants plowed 



under) 2,195 



Tobacco following lamb's quarters (Chenopodium album) . 2,427 



Tobacco following pigweed (Amaranthus retroflexus) . 2,632 



Tobacco on sterilized plot 2,564 



Spacing Experiments. An experiment to attempt to determine the effect of 

 spacing on yield and especially on the contour and thickness of leaves of 

 tobacco was carried on during the past year. Not all of the data have as yet 

 been taken, as to quality, desirable shape, etc., but the yields are included 

 in the following: (the distance between rows is indicated; the two types of 

 tobacco used are common Havana and No. 13, a type more resistant to black 

 root-rot (Thielavia basicola). 



