WHEAT BEST STANDS ABSENCE OF MAM IM 



growing wheat continuously, and witli 17;") l.uslicls on ihf 

 similarly unnianured plot where wheat is grown after a hare 

 fallow. In the carhcr period on the rotation field the 

 uiimanm*ed plots yielded 82 per cent, of the wlieat on tJii- 

 manured plots, but in the later period tlie produelion without 

 niamu-e had fallen to 66 per cent, of that on the niaiuired 

 plots, whereas in the corresponding later years of tlic con- 

 tinuous wheat-field the production on the uninaiuired plot 

 lias fallen to 29 per cent, of that on tlie maiuirecl j)|(.t. 

 It is clear that the progressive cropping out of the soil is 

 telling upon the wheat, though it will take a very long time 

 before the crop grown in rotation is reduced to the level of 

 the nninanured land that is continuously cropped with wlieat. 



II. — Effect of the Manlkes. 

 The three main plots into which the experimental field is 

 divided receive the following manurial treatment per acre : — 

 O. Unmanured continuously. 



M. 3^ cwt. superphosphate, 500 lb. sulphate of potash, 

 100 lb. sulphate of soda, and 200 lb. sulphate of 

 magnesia for the Swedes. 

 C. Minerals as on Plot M., together with 200 lb. ammo- 

 nium-salts and 2000 lb. rape cake for the Swedes. 



Table LXVI. — Effect of Manures on Crops grown in rofafiim, A'/dr// Fiehi. 

 Avcnific jproduce per acre over the jive last Courses^ 1884-1903. 



Average of 3 courxes. 



t Average of 2 coaw«. 



