New Yorn AGRICULTURAL EXPERIMENT STATION. Sha 
TABLE XI.—COMPARATIVE YIELDS IN DRIED BLOOD SERIES WITHOUT 
MANURE AND WITH DIFFERENT PROPORTIONS OF MANURE. 
CLAY LOAM, 
Comparative yields with— 
a 






a 
No ma- 
nure or 2 Manure, by weight. 
com. — ee ee 
Crop. fert. None. 5p. ct.2 10 p. ct.+ 15 p. ct.4 20 p. et.4 
Head lettuce, 
1898-1899... 12 2.25 12.44 15.31 15.69 16.94 
2 Manure, by bulk. 
AS 

re 
None. 5p.ct. 10p.ct. 15 p.ct. 20p. ct. Packed. Loose. 
Head lettuce, 
1898-1899. . 1 18.66 16.78 
1899-1900. . Tas. 021 Ooo em OLue 26st moor O tb oo! 4247 
1900-1901. . 1 1.65 4.60 5.00 4.91 4.16 4.89 4.24 
Loose lettuce, 
1899-1900. . Tee Olin a eet ee le Oe Ge OR. 4.52.9 2.92 
1900—1901.. Lite (sil .0od irs Oo ee t.ouei- 26,00; 7 Ft 1G. 88 
SANDY LOAM. 
2 Manure, by weiht. 
——————— Se 
None. 5p. ct.+ 10 p. ct.2 15 p. ct. 20 p. ct. 
Head lettuce, 
1898-1899... 1 8.00 3.99 4.30 4.26 3.87 
2 Manure, by bulk. 
— ——_— "ee —aw 
pa er ec —— —_—. =~ 
334 p. ct.8 
6 ae ee 
None. 5p.ct. 10p.ct. 15. p. ct. 20 p.ct. Packed. Loose. 
Head lettuce, 
1898-1899. . 1 SS BS Os: 
1899-1900. . La apo o.0l) oGeoo oO.6¢ 41,338" 88.388 ~ 25.00 
1900-1901. . Dy eb oe 3303 44. 695 © 42.68)- 28h Be 20 4 2 Fk 
Loose lettuce, 
1899-1900. . 2.94 213.27 006: 63) 715.547 15-590) 218.78 *© 9.64 
1900-1901. . eens: Oia oO tt SO” Lo Gm iat hee Dy S80 
1 With the manure used, 5, 10, 15 and 20 per ct, by weight are equivalent to 11}, 22%, 34 and 
454 per ct., respectively, by bulk. 
2 All plants under these headiugs received 600 pounds acid phosphate per acre, 400 pounds sul- 
phate of potash and 1,000 pounds dried blood, except where 334 per ct. of manure was used. 
3 This is equivalent to 14 2 per ct. by weight for first crop on the clay loam and 14.7 per ct. 
for the first crop on sandy loam. No commercial fertilizers were used on these boxes. 
Leaving out of consideration for the present those portions 
of soil which received 33 1-3 per ct. of manure without any com- 
mercial fertilizers, let us compare the rate of increase of the 
yield where none but commercial fertilizers were used with the 
rate where these were combined with manure. 
From the table just given it appears that on the clay loam the 
use of 5 per ct. for the first crop gave an increase of 10.19 points 
over the yield with no manure; doubling the manure gave a 
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