88 



BULLETIN 699, U. S. DEPABTMENT OF AGRICTJLTTTKE, 



Table LIII. — Yields per acre of com, wheat, and hay — average for the 18-yetw 



period, 1891-1915. 



Plot 



Treatment. 



Com. 



Wheat. 



Hay. 



ber. 



Grain. 



Stover. 



Grain. 



Straw. 



1 



None 



Bushels. 

 40.62 

 63.40 

 66.75 

 32.38 

 63.69 

 67.04 

 31.16 

 56.67 

 61.54 

 34.14 

 38.97 

 60.62 

 61.48 

 31.77 

 52.85 

 S9.37 

 37.94 

 47.78 

 45.20 

 33.88 



Pounds. 

 2,365 

 3,464 

 3,677 

 2,050 

 3,372 

 3,578 

 1,982 

 3,232 

 3,475 

 2,049 

 2,375 

 3,400 

 3,498 

 2,037 

 2,921 

 3,271 

 2,331 

 2,690 

 2,494 

 2,028 



Bushels. 

 13.28 

 24.94 

 26.46 

 11.75 

 26.57 

 27.06 

 10.90 

 21.52 

 23.13 

 11.14 

 14.40 

 24.39 

 24.31 

 11.29 

 20.72 

 22.03 

 11.59 

 16.16 

 15.42 

 10.72 



Pounds. 

 1,543 

 2,674 

 2,869 

 1,370 

 2,907 

 3,031 

 1,319 

 2,423 

 2,691 

 1,364 

 1,732 

 2,712 

 2,695 

 1,334 

 2,296 

 2,494 

 1,409 

 1,841 

 1,885 

 1,382 



Pounds. 

 3,020 



2 



Yard manure and raw phosphate 



4,357 



3 





4,765 



4 



None . . 



2,299 



5 





4,260 



6 



Stall manure and acid phosphate 



4,851 

 2,314 



7 



None 



8 



Yard manure and kainit 



3,547 

 4,238 



9 



Stall manure and kainit. 



10 



None 



2,488 



11 



do 



3,251 



12 



Yard manure and gypsum 



3,885 



13 



Stall mfiniire and gypsum , . , , 



3,909 



14 



None 



2,354 

 3,337 



4,000 



15 



Yard manure, untreated 



16 



St.nll rnaniirpi/ iiTitreatPd 



17 



None ; 



2,694 



18 



Chemical fertilizer 



3,163 



19 



do 



3,255 



20 



None 



2,679 





Average from manure and raw phosphate. 

 Average from manure and acid phosphate. 

 Average from manure untreated 







65.07 

 65.36 

 56.11 

 34.77 



3,570 

 3,475 

 3,096 

 2,153 



25.70 

 26.81 

 21.37 

 11.76 



2,771 

 2,969 

 2,395 

 1,395 



4,561 

 4,555 

 3,668 





A vprngft nnms^nnrfid yields 



2,536 









Table LIV. — Barnyard manure on crops grown in three-year rotation. Average 

 annual increase per acre for entire period of experiment figured first accord- 

 ing to Thome, by comparing treated plots with the two nearest check plots, 

 and second by comparing treated plots with average of all check plots. 



Plot 

 num- 

 ber. 



Treatment. 



Yard manure and floats 



Stall manure and floats 



Yard manure and acid phosphate 

 Stall manure and acid phosphate. 



Yard manure and kainit 



Stall manure and kainit 



Yard manure and gypsum 



Stall manure and gypsum 



Yard manure, untreated 



Stall manure, untreated 



Chemical fertilizeri 



do2 



Average annual increase according to Thome. 



Com, 18 crops. 



Grain. Stover. 



Bushels. 

 25.53 

 30.95 

 31.72 

 35.48 

 24.11 

 28.40 

 23.83 

 27.31 

 19.03 

 23.48 

 10.74 

 10.48 



Pounds. 



1,204 



1,522 



1,344 



1,572 



1,237 



1,449 



1,171 



1,348 



815 



1,015 



475 



400 



Wheat, 18 crops. 



Grain. 



Bushels. 

 12.17 

 14.20 

 15.09 

 15.68 

 10.54 

 12.07 

 11.02 

 11.97 

 9.33 

 10.46 

 4.22 

 4.26 



Straw. 



Pounds. 



1,189 



1,492 



1,554 



1,693 



1,089 



1,343 



1,113 



1,229 



939 



1,110 



394 



472 



Clover 

 hay, 15 

 crops. 



Pounds. 

 1,578 

 2,225 

 1,956 

 2,542 

 1,176 

 1,807 



931 

 1,255 



870 

 1,419 



482 



635 



1 Acid phosphate, 80 pounds; muriate of potash, 80 pounds; nitrate of soda, 160 pounds. 

 : Acid phosphate, 80 pounds; muriate of potash, 10 pounds; tankage (7-SO), IOq pounds 



