THE FARMER'S MACiAZINE. 



373 



mentally in the ordinary rotation of turnips, barley, 

 clover (or other leguminous crop), and wheat. In the 

 rotation experiments one plot was entirely unmanured 

 throughout each course ; a second had superphosphate 

 of lime only, and this for the root crop alone ; and a 

 third was well manured with mineral, nitrogenous, and 

 carbonaceous manure, for the roots commencing each 

 course. The produce of the barley of three successive 

 courses of each of these differently manured rotations 

 has been recorded. 



The experiments on the successive growth of barley 

 on the same land with different manures come first un^ 

 dtr consideration. And the point relating to them to 

 be first noticed is the very vary in result obtained with 

 one and the same manure, in the six different seasons 

 (1852 — 7) in which the trials were made. On this 

 point it is remarked — 



" From the pervading influence of season, by which 

 the produce may be double as much one year as another, 

 even with one and the same set of conditions supplied 

 by the farmer, and by which, when unfavourable, the 

 crops most highly manured suffer 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." It resulted, too, that the higher the con- 

 dition of manuring, if beyond a somewhat even narrow 

 limit, the less was the proportional return of produce 

 for a given quantity of manure. 



Referring to the effects of the different manures, 

 notes taken in the field showed, that the crops grown 

 on the unmanured, and on the only mineral-manured 

 plots, as a rule stood up till the time of cutting. Those 

 having nitrogen in manure equal to about 501bs of am- 

 monia per acre per annum (supplied by 2001bs. of salts 

 of ammonia,* or 2751bs. nitrate of sodat), were gene- 

 rally, more or less laid ; as also were those grown by 

 farmyard manure. Those having double this amount of 

 nitrogen in the manure, or more (supplied by 400lb8. 

 ammoniacal salts, 5501bs. of nitrate of soda, or in 

 2,0001bs. rape-cake), were invariably laid, and in most 

 years very much and injuriously so. The produce with 

 this latter amount of manure was in fact far too heavy 

 to bear any moderate amount of rain about or after the 

 time of heading. Of the mineral manures used, the 

 ''mixed alkalies," which consisted of a mixture of 

 the sulphates of potash, soda, and magnesia, whether 

 alone or in admixture with nitrogenous manures, in- 

 variably tended to retard the ripei.ing of the crop. 

 Superphosphate of lime, on the other hand, always 

 tended to early ripening. The superphosphate of lime 

 also always gave a notable increase of crop, whether it 

 was used alone, in admixture with other mineral manures, 

 or with nitrogenous manures. The nitrogenous manures, 

 however, increased the produce in a far greater degree 

 than any of the purely mineral combinations. 



In the following table is given a summary of the 

 numerical results obtained, showing the average annual 

 produce taken over the six years of the experiments. 



by each characteristic description of manure em- 

 ployed : 



K-O tOOO-J OiCntf^MlOl-" 



JO to <o 'O en 



O O O O en 



O O O S O 



o o CM 



a- ? S^ 



n n 



q a 2 



— a ID 



B S 2 



B 2 S 



■in 2. 2. : 



* An equal mixture of the sulphate and muriate of ammoni?. 

 of commerce. 



t The commercial nitrite of soda. 



« ffl B. 3- B O, 



■'-" &-S S- O i^ 



• g E. c f» "> o- J] 



B g g t» p ■P 5' 



£ . n> ^ S. L 2- " 



E.-g B S 2 = "B 

 B o 2 g £ <» n. 



I^ c ii» ST ^ B 9. 



OBJ W _, S 3 =■ 

 B E.O B B B o^ 



<-' ;r o o « "■ 

 o a - -St- 



B f 



5.;= 

 -2- B 

 •V3 



B^; Z. 



c = " ; 



p g. o 1 



° 5 s> I 



i|sl 



ra ™ B _ 



B 3 5' 

 3 B S"- 



O O Ti 



il2- 



« s.^: 



ir 



^3 



O W C CO M 



oiOT cuwtn ut v\ in vj ot^ 



M »0 NS to M JO 



"cn "Oi'oi "Oi Oi t^ 



— OJ-J O Oi^i 



OS >*»■ 63 05 OS 1— I 



JO 63 M _>-i 65 J- 



■^ CO ^ cn ■*. 5 



CO C3S O 00 o * 



p^ ,^ M en ^.t 



CO 05 MM M 



tn Oi Of 

 ij'i— ' en 



fO ^ _H- _,_! (O ». 



en CO bo ^ ^ » 

 cc c. 00 o: •£ ■ 

 00 '.o en o O 



1^ en _03 CO en — 



Vj to OS 03 ^^ (IB 

 to re 4^ 4^ CO - 



CO 0» tx) en ~I 



0-2. 

 c r> 



53 



O) so 



OH 



«?7h 



-» 2 o o 

 jD B a. - 

 « » B so 



00 pi 

 ^!^ 



^§ 



KM 



00 Z 



;>H 



KO 



P« 

 ccO 



^^ 



cncj 

 I 65) 



§2 



is 



? G 



?l 



O 



CO 



p. 



o 

 o 

 25 



00 



pi 

 o 

 G 



H 



< 



Fr-m a review of the whole of the results relatiig to 

 the action of the special manures upon llie Parley crop, 

 taking the average of six successive years of growth by 

 each,°on land in uQ agricultural sense Eomewhat ex. 



