THE BROWN ROOT ROT OF TOBACCO AND OTHER PLANTS 



21 



1923. The differences are, however, too small to be significant. It is 

 interesting to compare the estimated market value of the crops from 

 the various plats on the basis of yield and quality. On the basis of 

 12 cents per pound for the poorest grades and 40 cents for the best 

 grade of tobacco, the value of the crop following timothy was com- 

 puted to be $52.80 per acre, whereas that from the single-fertilized 

 tobacco plat was $624 per acre. 



Table 2. — Yields of crops on brown root-rot rotation plats located at Whately, 

 Mass., showing the influence of various crops on the succeeding yield of 

 tobacco 



[Acre yields in pounds except as otherwise stated] 





Plat 



Yields of crops in 

 rotation 



Yields of cured tobacco 

 (pounds) 



Crop in rotation 



1922; 

 A and B 



series 



1923; 

 A series 



1923; 

 B series 



1924 





A series 



B series 





/No. _____ 

 \No.l2-._ 



112 

 107 



108 

 100 



680 

 400 



400 

 280 



1,060 





1, 040 







109.5 



104 



540 



340 



1,100 









Timothy (yields in tons). 



/No. 2.... 

 \No.l3___ 



3.15 

 2.2 



4.0 

 3.1 



480 

 400 



320 

 240 



1,240 





920 







2.67 



3.55 



440 



280 



1,080 











/No. 3 







1,040 

 800 



1,120 

 960 



1,600 



Beans 









1,160 





















920 



1,040 



1,380 













Potatoes (yields in bushels) 



/No. 4.... 

 \No.l5._- 



140 



96 



229 



247 



1,160 

 1,000 



1,200 

 1,240 



1,520 





1,440 



Average 



118 



238 



1,080 



1,220 



1,480 



Tomatoes (yields in tons in 1922, in bushels 

 in 1923) 



/No. 5—. 

 \No.l6... 



3.5 



2.1 



300 

 280 



1,360 



1,400 



1,320 

 1,240 



1,640 

 1,520 



Average ._ .. 





2.8 



290 



1,380 



1,280 



1,580 











iNo. 6 1 





1,480 

 1,440 



1,640 

 1,640 



1,640 



Fallow ______ 







1,480 











1 





1,460 



1,640 



1,560 





l 









(No. 7 ! 



428 

 160 



1,440 

 1,120 



1,320 

 1,360 



1,440 



Onions (yields in bushels) 



\No. 18 . 

















294 



1,280 



1,340 



1,420 









Tobacco ___ ... 



/No. 8.... 

 \No.l9__. 



460 

 600 



1,600 

 1,520 



1,600 

 1,520 



1,600 

 1,740 



1,600 





1,740 



Average _ .. 





530 



1,560 



1,560 



1,670 



1.670 









Tobacco (double fertilization) 



/No. 9.... 

 \No.20... 



540 

 780 



1,520 

 1,480 



1,520 

 1,480 



1,520 

 1,600 



1,520 

 1,600 



Average.. . ___ ___ . 





660 



1,500 



1,500 



1,560 



1,560 









Clover (yields in tons). ;_ 



/No. 10... 

 \No.21_._ 



2.7 

 1.0 





480 

 720 



320 

 640 



880 



2.0 







1,080 



Average. _ __ 





1.85 





600 



480 



980 











Tobacco (limed) 



/No.ll... 

 \No.22... 



380 

 740 



1,460 

 1,560 



1,460 

 1,560 



1,340 

 1, 500 



1,340 





1,500 



Average... .. .. . 





560 



1, 510 



1,510 



1,420 



1, 420 









