lar of fertilizer, as in the last part of Table II, it will be see« 

 that one dollar invested in manure gave only an increaes wortlt 

 $3.60 ; while one dollar invested in complete chemicals gave ax 

 increase worth $5.80, and one dollar invested in the best com- 

 bination (Plot 10) gave an increase worth $7.00, and one dollar 

 invested in prepared fertilizer gave an increase worth $4.20. 



Here are figures well worth careful consideration, and they 

 do not stand alone, for in Bulletin No. 10 will be found the re- 

 port of a duplicate series, made in 1889 by the same party, 

 which shows the same general results, demonstrating the value 

 of such tests when properly carried out. 



For the purpose of showing the composition of the fertilizer 

 producing the best results I have selected those giving the thru 

 highest yields as well as the one giving the highest, both from the 

 experiments of 1889 and 1890, and have given below the chemical 

 composition : 



( p*o s , % 



Best 3 yields, \ K a O, % 

 ( N, % 



\ P 2 5 , % 



Best yield. 4 K 9 0, % 



( N, % 



CONCLUSIONS. 



The above results so fully confirm previous observation*, 

 that I shall simply reprint the conclusions given in Bulletin N». 

 10 of this Station, p. 12 : 



1st. Chemicals when properly mixed can fully take the 

 place of farm yard manure as a source of plant food. 



and. Chemicals when properly mixed can and do give 

 greater increase of crop than commercial fertilizers. 



4th. The average chemical composition of fertilizers for 

 New Hampshire should be Phosphoric Acid, 9/on per cent, Pot- 

 ash, 9/015 per cent, Nitrogen, 2 to 4 per cent, whereas, the fertili- 

 zers offered to us in the market, average Phosphoric Acid, 1 1 per 

 cent, Potash, 2.5 per cent, Nitrogen, 2.5. 



HOW TO GET CHEMICAL FERTILIZER. 



Dissolved bone-black, containing sixteen per cent of avail- 

 able phosphoric acid, muriate of potash, containing fifty per cent 



12 



