Grahi Manuring Experiments, 190o-4. 



779 



that 111 the three cases where gypsum appears to have produced an 

 effect, Thomas phosphate has either equalled or exceeded iu its action 

 an almost similar quantity of superphosphate, and it may perhaps be 

 assumed that the small addition of lime, either in the carbonate or 

 sulphate form, has been responsible for the increased yields. 



With respect to the harrowing" tests, this operation, taking the 

 figures of the average, appeared to produce no good effect, a result, 

 considering the season, creating no surprise. 



The tests to determine the best method of applying the fertilizer 

 appeared to largely favour the drill, as evident in the following 

 returns : — 



Gains Due to 102 lbs. of Superphosphate per Acre. 



Average of two fields 



Applied with Drill. 



Bushels. 

 9-75 



Broadcast Application. 



Bushels. 

 6-00 



PlouKhed in. 



Bushels. 

 611 



The Residual Effect of Manures, 



The fact of the ftill profits, resulting from the use of phosphatic 

 manures, not being contained in the first year's returns has already 

 been demonstrated to the farmer by field tests conducted by this 

 Branch. In these tests, the residual effects on a second year's crop 

 have been determined and made known. It is, however, a little 

 surprising to find that such small quantities as 10 and 20 lbs. of a 

 superphosphate are capable of exercising so marked a residual effect 

 after a period of four years from the first application. In the year 

 1900, a small field embracing 15 plots each l-5th of an acre in area 

 was put down on the farm of Mr. McPherson, of Wycheproof . In the 

 following year the field was let out to grass, fallowed the next year, 

 and then cropped the succeeding season without manure. The 

 increased yields due to manures, both in the first and fourth years, 

 are given in the following return. With the exception of one or two 

 irregularities the effects appear consistent throughout. 



Results of Experimenial Manure Plots at the Farm of 



Mr. 



A. McPherson, Wycheproof. 

 Plots l-5th Acre in area. 



No. 



of 



Plot. 



1 

 2 

 3 



4 

 5 

 6 



7 



9 



10 

 11 

 12 



13 

 14 



Manures used per Acre- 



ID lbs. concd. superphosphate 



No manure 



20 lbs. concd. superphosphate 



30 lbs. concd. superphosphate 



No manure 



50 lbs. ordinary superphosphate 



56 lbs. Thomas phosphate . . 



No manure 



50 lbs. bonedust 



10 lbs. concd. superphosphate 



36 lbs. sulphate of ammonia 



No manure 



20 lbs. concd. superphosphate 



72 lbs. sulphate ammonia 



50 lbs. Maldon Island guano 



Partial superphosphates 

 No manure 



1900. 



Sown and 

 Manured. 



Yield per Acre. 



Bushels. 



26 04 

 23-92 

 28-62 

 28-87 

 24-33 

 28-96 

 27-42 

 23-92 

 26-17 



26-96 



•23-33 



29-84 



27-54 

 23-50 



