1905.] Oil Cake and Farmyard Manure. 



547 



feeding of cattle and sheep shows that sheep-feeding paid much 

 better than cattle-feeding. In 1904-5 the sheep left £1 14s. 

 more than the cattle per acre of 20 tons of turnips, and in the 

 previous year the difference was considerably greater than 



In comparing the relative value of high and low grade linseed 

 cakes it is frequently stated that a high grade cake, rich in oil, 

 gives better manure than a lower grade 



better manure than poor oil cake. In making a rich cake the 

 seeds are subjected to a certain pressure to extract part of the 

 oil, whilst for poor cake solvents are used in addition, and after- 

 wards displaced by steam. 



For the purpose of testing the comparative values of the two 

 substances, experiments have been carried out by Messrs. G J. 

 Goodwin and E. J. Russell at the South-Eastern Agricultural 

 College, Wye. 



Two red polled bullocks were selected by the farm authorities 

 as being as nearly alike as they could find ; the animals were 

 kept in separate adjoining covered boxes of approximately the 

 same size, supplied with the same amount of litter, and fed on 

 the same ration. Both food and litter were analysed. Samples 

 of the well-trodden manure were taken during the experiment, 

 and also at the conclusion, when the dung was taken out, weighed 

 and spread on to potato land. 



The results are discussed in considerable detail in the report, 

 but analysis failed to reveal any difference between dung 

 made from rich oil cake and that from poor oil cake, the rest 

 of the ration being the same in both cases. 



Among the subsidiary questions arising out of the experi- 

 ment, some of the most important from a practical point 

 of view are involved in the loss of nitrogen. The dung wa> 

 made in a covered box, there was sufficient but not too much 



* With regard to comparative value of Bombay and Egyptian cotton cake, 

 reference may be made to an experiment reported in this Journal, Aug., 1904, p. 289. 



this* 



Oil Cake and 

 Farmyard 

 Manure. 



containing a smaller proportion. 



There are several reasons why rich oil 

 cake might a priori be expected to yield 



x x 2 



