REMOVAI, ()!• MIXKKAI. ( '( )\SI ITI•I•:\T 



•_'l:; 



It tliiis appears that wlicn laml is (•(.ntiiiiK.iisly cn.jtprd 

 -without manure and witliout tlir restctralioii ol" any parts of 

 the crops grown to tlie soil, tlie animal witlidrawal of the chicl 



Table LXXV — Phosplwric Arid and J'utdsh rcmovrd hi/ f',i,j, 

 (jroion in Rotation. Agdell Field. 



manurial constituents will be about the same wlictlici- the land 

 is put under a rotation or grows a cereal crop CNcry year. (Jf 

 course the rotation plot in this case is practically growing two 

 cereal crops only in the four years, with a fallow lietween each, 

 so small is the production of roots in the first year of the 

 com*se. 



Table LXXVI. (p. 214) brings together for coini.arison 

 the annual losses on the three unmanm-ed plots in (piestion. 



As regards the manured plots growing clover or bean.s. we 

 fin<l that a little more than so lb. of pliosj.lmiic acid i> 

 removed during the four years of the rotation and nm>t br 

 replaced by manure if the fertility of the land i> in br main- 

 tained. If 15 tons per acre of <lung be given during the 

 rotation, more phosphoric acid will be returned than is 

 withdrawn liy the crop; but, as tin; phosphoric aei<l in <lung is 



