niK MAN VtJEMKNT OK MAM'KES. Di> 



manun, we add nulhiiii; to il ; thorr is iio inori' aclual nitroirpn, 

 or phtispljorir acid, or jiola^li, t»r any otlitr iiii:rfdiciit after ftr 

 DR-iilation lliaii tberi- was bcfori", imt tlit!**' iiifiR-dicnl.s art' rt iidcrtM] 

 more soiiiblf, and can Sc more nipialy taken up by the j hints. In 

 this sense, therefore, there is a great gain. 



One lliin!? is certain, we do not, in many cases, pet anylliinp 

 like as much bene'Jt from our manure us the int;rcdients il cou 

 Uiins wimld lead us to ex|H.-cL 



Mr. I^awes, on Ins clayey soil at Hothamsted, England, has 

 pn>wn over tliirty crops of wheat, year aft«T year, on tlie san»e 

 land. One plot has received 14 tons of ".tarn-yard manure per 

 acre every year, antl yet the produce from this phit is no hirt'er, 

 and, in fact, is fncpiently much less, than from a few hundred 

 |>ounds of artificial manure containim: far les.-* nitropen. 



For nineti-en years, iKl'i to isTO, s»tme .)f the pl<»ts have received 

 the saniL' manure year after year. Thi' folhiwitii: shows tlie </r<T 

 aye yield for the nineteen years : 



Whrat Stfiiw 



]ter anr. pi r wrr. 



Plot 5. — Mixed nifnend manure, alone 17 bus. 15 cwL 



'* 6.— .Mixcil mineral inunure, and 'Mt lbs. ttniinu- 



Jijaeal salts 27 lius. 25 cwt. 



" 7. — Mixed mineral manure, anil -Kio lbs. amnio- 



niacal salts ;;0 t)us. 3G cwt. 



" 9. — Mixed mineral manure, and 55(» llis. nitrate 



of soda 37 bus. 41 cwt. 



" 2. — 14 tons farm-yard Junp SO bus. 34 cwt. 



The 14 tons (31,360 lbs.) of farm-yard manure contained about 

 8,540 liis. orpaliic luatter, 8G8 His. mineral matter, and 200 lbs. ni- 

 lroL:en. Tiic 4(HJ lbs. of ammoniacal salts, and the r>.jO lbs. nitrate 

 of soda, each contained 82 lbs. of nitropen; and it will be seen 

 that this 82 lbs. of nitropi n produced as preat an effect as the 200 

 ll)s. of nitropen in barn-yard manure. 



Similar experiments have been made on barhy, with even more 

 strikinp results. The plot dressed with 300 lbs. superphosphate of 

 lime, and 300 lbs. ammoniacal salts per acre, produced as larpe a 

 crop as 14 tons of farm-yard manure. The averape yield of barley 

 for nineteen crops prown on the same land each year was 48 bus. and 

 28 cwt. of straw i>er acre on both pi ts. In other words, 41 lbs. of 

 nitropen. in ammoniacal salt^, produced r.s preat an effect as 200 

 lbs. (tf nitropen in farmyard manure ! Durinp the nineteen years, 

 vne plot had received 102.200 lbs. of orpanic matter. 16,4!t2 lbs. of 

 mineral matter, and 3.800 lbs. of nitropen; while the other had 

 received only 5,700 lbs. mineral matter, and 77fl lbs. of nitropen- 

 and yet one has produced as large a crop as the other. 



