438 



Bulletin 267. 

 TABLE X — Continued. 



Plat 

 No. 



1467 

 1468 



1469 



1470 



1471 



1472 



1473 

 1474 



1475 



Treatment 



240 

 480 

 160 



120 

 480 

 160 



240 

 240 

 160 



240 



480 



80 



3000 



3000 



120 



240 



80 



lbs. Nitrate of soda . . 

 lbs. Acid phosphate . . 

 lbs. Muriate of potash 



lbs. Nitrate of soda . . 

 lbs. Acid phosphate . . 

 lbs. Muriate of potash 



Nothing 



lbs. Nitrate of soda . . 

 lbs. Acid phosphate . . 

 lbs. Muriate of potash 



lbs. Nitrate of soda . . 

 lbs. Acid phosphate . . 

 lbs. Muriate of pota.sh 



Nothing 



lbs. Marl 



'lbs. Marl 



lbs. Nitrate of soda . . 

 lbs. Acid phosphate . . 

 lbs. Muriate of potash 



Nothing 



Appar- 

 ent 



increase 



per 



acre, 



tons 



6.21 



5-95 



5-77 



5.10 



— 1.49 



70 



Value 



of the 



increase 



per acre 



'93: 



18.50 



17.94 



15.86 



— 4 63 



2. i! 



Cost of 

 the fer- 

 tilizers 

 per acre 



13.60 



10. 24 



11.92 



11.84 



8.00 

 14. 80 



Net gain 

 or loss 



(— ) 

 per acre 



5-71 



8.26 



6.02 



4.02 



-12.63 

 -12 . 62 



Discussion of results 



The use of lime alone or combined with a complete fertilizer in 1907 

 (Table VIII) resulted in a heavy net loss. The substitution of marl 

 for the lime in 1908 resulted in a still heavier net loss, and an apparent 

 decrease where marl alone was applied. Eliminating the two limed 

 plats from the calculation, the remaining twenty plats which received 

 fertilizers applied singly or in combination, showed an average net 

 gain of $1,51 per acre in 1907. The same twenty plats showed an average 

 net gain of $3.22 per acre as the result of fertilizers applied in 1908. 



The greater net gain from the use of fertilizers in 1908 is probably due 

 to the more abundant rains, greater freedom from leaf spot and the 

 possible residual effects of the fertilizers applied in 1907. 



