570 Report of Experiments icith different Manures 



as above described, the result is, of course, only an approxima- 

 tion to the truth. Looked upon as such, it is not without its 

 value and interest. The so-estimated amounts of after-feed on 

 the respective plots show, as compared one with another, rela- 

 tions very coincident, in general direction, with those indicated 

 by the mown first-crops of hay. 



It has already been noticed that the produce of first-crop hay 

 on Plot 2 (the duplicate unmanured plot) was less in the first two 

 seasons, and more in the third, than on Plot 1, the other un- 

 manured one. Table II. shows, on the other hand, that there 

 was rather more after-feed in the two first seasons on the duplicate 

 unmanured plot than on the other. Taking the mean of the two 

 plots, the unmanured land shows an average annual yield of after- 

 grass = 578 lbs. of hay. The sawdusted plot, as in the first crop, 

 so again in the second, gives rather less pi'oduce than the unma- 

 nured one. The ammoniacal salts alone gave rather more after-feed 

 than the unmanured plot ; and the ammoniacal salts and sawdust 

 gave the same amount as the ammoniacal salts alone. The Plot 

 with the " mixed mineral manure " alone, with its luxuriant 

 Leguminous herbage, gave more after-feed than the one with 

 ammoniacal salts alone. The addition of the sawdust to the 

 "mixed mineral manure " gave no further increase. Tlie Plot 

 with both the "mixed mineral manure" and the 400 lbs. of am- 

 moniacal salts, as in the first crop, so now in the second, gave 

 more produce than either of the plots where the respective 

 manures were used separately. The addition of sawdust to the 

 mixture of the two manures gave no further increase. The ad- 

 dition of cut wheat-straw, instead of sawdust, showed some advan- 

 tage in the second crop, the produce in the first crop being 

 somewhat deficient. The combination of the " mixed mineral 

 manure," and the double amount (= 800 lbs. per acre) of ammo- 

 niacal salts, gave the largest amount of first-crop hay, and now 

 again the largest amount of after-grass, of any manure in the 

 series. 



The nitrate of soda, Avhich was used only in the third season, 

 and then yielded less of first-crop hay than an amount of am- 

 moniacal salts equal to it in contents of nitrogen, appears, 

 according to the figures in the Table, to have given, on the other 

 hand, a larger amount of after-grass. As, however, a large and 

 equal number of sheep was put upon each of the nitrate plots, 

 axidfor one day only, not even the relative amounts, still less the 

 actual quantities recorded as estimated second-crop hay, can be 

 much relied upon in these cases of experiment with the nitrate. 



The farmyard manure plots gave of second crop, as they did 

 of first, a produce intermediate between that without manure, 

 and that by the " mixed mineral manure " and 400 lbs. of am- 

 moniacal salts. 



