1 84 



Journal of Agricultural Research voi. xiii. No. 3 



Table VIII. — I^imestone requirement of air-dried green manures (Series 11) 

 [Results expressed as pounds of limestone per 2.000.000 pounds of soil] 



Materia!. 



Period i 

 (2 weeks). 



Period 3 

 (3 months. ) 



Period s 

 (7 months). 



Period 6 

 (9 months). 



Average 



for 9 

 months. 



Control soil 



Legume mixtures: 



Soybean 



Sweet clover . . . . 



Alfalfa 



Red clover 



Hairy vetch 



Subaverage. .. . 



Nonlegume mixtures: 



Rape 



Com 



Rye 



Redtop 



Sorrel 



Subaverage . . . . 



Grand average . 



4,644 



3,860 

 3.325 

 3.965 

 1.763 

 4,847 



4, 400 



4,871 

 3,321 

 3,592 

 3,288 

 3,187 



3,652 



4, 066 



4,644 



4, 169 

 5,515 

 4,939 

 2,237 



5,277 



4,871 



5, 568 

 5.345 

 5.481 

 4,203 

 6,366 



4,904 



5,722 

 6,536 

 5.790 

 3. 626 

 6,265 



4,427 



5.393 



5.5^ 



5,790 

 5, 210 

 3,897 

 4, 304 

 3,08s 



5,616 

 6,910 

 5,616 

 5.176 

 4,813 



5,515 

 6,944 

 5.960 

 5.855 

 5.481 



4,457 



5,626 



5,951 



4,442 



5.509 



5.769 



4,765 



4,817 

 5,179 

 5,043 

 2,957 

 5,688 



4,737 



5,448 

 5.596 

 4,766 

 4,656 

 4, 141 



4,921 



4,829 



Table IX. — Changes in the limestone requirement of soils (Series H) 

 [Results expressed as pounds of limestone per 2,000,000 pounds of soil] 



Material. 



Control soil 



Legume mixtures: 



Soybean 



Sweet clover. .. . 



Alfalfa 



Red clover 



Hairy vetch . . . , 



Subaverage . . . 



Nonlegume mixtures 



Rape 



Com 



Rye 



Redtop 



Sorrel 



Subaverage. .. 



Grand average 



First 



two 



weeks. 



-403 



-511 



-345 



■1,706 



386 



;i6 



-234 

 ,273 

 -991 

 -62 

 .592 



-8.^,1 



-674 



From end 



of second 



week to end 



of third 



month. 



-957 

 ■1,858 

 ■1,078 

 ■I, 194 



—841 



From end 

 of third 



to end of 

 seventh 

 month. 



227 



309 

 2,194 



974 



474 

 430 



■I, It 



-577 

 -2,275 



-I, 174 

 -1,368 



-954 



■I, 270 



876 



919 

 1,889 



305 

 I, 016 

 — 102 



80 q 



841 



Eighth 

 and ninth 

 months. 



33 



154 

 1,191 



309 



-577 



— lOI 



195 



-lOI 



-34 

 344 

 679 

 668 



253 



