PRACTK'AI. CONCUSIONS 119 



Pk ACTUAL ('(»N(l,rsi(tNS 



Looking at the ivsults of ilic cxjttM-imciits at IJotliaiiistciI 

 on tlie continuous growth of niani^cls with \aiious manures 

 for twenty-seven years, from tlie point of view of the practical 

 farmer the following general (■onclu>ions can he drawn : 



1. Mangels can be grown continuously on the same land 

 without injuring the tilth of the land or the health of tlu^ crop. 



2. A liberal dressing of farmyanl manure forms tin- br>t 

 basis of the manure for mangels. 



3. The crop will further respond to considerable addition.^ 

 of active nitrogenous majiures to the dung, particularly of 

 nitrate of soda. 



4. A free supply of potash salts is essential to the pi-oper 

 development of the mangel, hence a specific potash mamn-ing 

 is desirable even when dung is used in large ([uantitie.s, and 

 on a strong soil initially rich in potash. When nitrogenous 

 manures are used in addition to <lung, the potash salts should 

 be increased pro rata, in order to maintain the health and 

 feeding value of the crop and to bring it to maturity. 



5. Superphosphate or other phosphatic manure is hardly 

 necessary with dung, and will give little appreciable return. 

 especially when the crop is grown in rotation. 



6. Since soluble alkaline salts are l)eneficial to the mangel 

 crop, either as direct foods or as economisers of potash, a 

 <lressing of salt should always be included among the manures 

 for the mangel crop. 



II. — Experiments upon Tium rs. IJaiin Fii.i.o. ls4:;-70. 

 The experiments u{)on tiu'uips may be dividi'd into fom- 

 series, the two earlier dealing with Norfolk white turnips, the 

 two later with vSwede.s. The chief difference between these 

 two crops lies in the gi-eater proportion of leaf and the more 

 watery nature of the white turm*i>. 



It will not be necessary to give th«' results obtained in the 

 first trial 1843-5, but the three later experiments were set out 



