THE FARMER'S MAGAZINE. 



275 



■ The plots witli miuenil maiuii-ea ouly yielded as 

 follows : 



1852 



1353 



1854 



ISbb 



1856 



1857 



Annual average 

 per acre .... 



Mixed 

 Alkalies. 



Bush. Pecks. 

 26 



27 

 36 

 34 

 16 

 32 



28 



Superphoa- 

 phateofTjime. 



Bush. Pecks. 

 28 2 



33 



40 

 36 

 17 

 33 



31 



Superphos- 

 phate and 



Mixed 

 Alkalies. 



Bush. Peck 



32 3 



35 2 



42 



37 



19 3 



39 3 



34 2 



The plots with nitr(>geu per acre equal to about 

 50 lbs. ammonia, witli aud without direct mineral 

 manures, yielded as follows : 



The next question examined by Messrs, Lawes 

 and Gilbert was the effect produced by doubling the 

 amount of nitrogen applied in the last-described 

 scries of trials. lOO lbs, per acre of ammonia were 

 therefore employed in the following experiments, 

 and with results given in the next table. 



1852 



1853 



18.J4 



1855 



1856 



1857 



Annual average 

 per acre .... 



i 200 lbs. of 

 550 lbs. of Sulphate and 2,000 lbs. of 

 Nitrate of Muriate of Rape- cake. 

 Soda. Ammonia, i 



Bush. Pecks 

 



53 

 37 

 49 

 42 

 58 



47 



Bush. Pecks. Bush. Pecks. 



44 



40 



56 



48. 



36 



49 



2 



3 



2i 



Oi 



1 



39 

 39 

 60 

 48 

 36 

 64 



46 



48 



In studying these very valuable results, the far- 

 mer will not fail to remark the great influence of 

 different seasons in modifying the profitable results 

 obtained by different dressings. Our reporters 

 allude to this, when they observe that from the 

 pervading influence of season, by which the produce 

 may be double one year that of another, even 

 with the same set of conditions supplied by the 

 farmer, and which moreover, when unfavour- 

 able, the crop most highly manured suffers most, 

 it results that the amount of produce obtained for a 

 given outlay in manure may be only half as much in 

 some seasons as in others. Then, again, it is evident 

 that some of these nitrogenous fertilizers were ap- 

 plied in excessive proportions. The reporters, in- 

 deed, observe, " The unmanured, and the only jni- 

 neral manured portions, as a rule, stood up till the 

 time of cutting. The crops with nitrogen equal to 

 50 lbs. of ammonia per acre were generally more or 

 less laid, as were also those grown by farmyard ma- 

 naure. Those having nitrogen equal to 100 lbs. or 

 more of ammonia per acre were invariably laid, and 

 in every year excepting in 1857 very much, and in- 

 juriously so, the crops being too heavy to bear any 

 moderate amount of rain about or after the time of 

 heading." The effect of these manures in influencing 

 the i)eriod of ripening is also a material considera- 

 tion. The " mixed alkalies" it seems, whether used 

 alone, or in admixture with nitrogenous manures, 

 invariably somewhat retarded the ripening. Super- 

 phospliate of lime, ou the contrary, whether used 



u 2 



