MANURE ON ENGLISH PLOTS 317 



phosphate gave the better result in the first year but a poorer in 

 the last two years. The second application of superphosphate gave 

 271 pounds increase in live weight in the three years after the sec- 

 ond dressing had been applied, as compared with 284 pounds by 

 slag in that period. That this manure becomes more quickly ex- 

 hausted than slag is shown by its giving only 22 pounds live weight 

 increase per acre in the ninth season (sixth after the second appli*- 

 cation) whereas slag gave 41 pounds in the same year. The net 

 gain from this plot was $3.30 per acre annually as compared with 

 $4.32 from slag similarly applied. With one year's exception (1900) 

 clover has not been so well developed on this plot, but at the same 

 time the clover increase has been of a satisfactory character, and 

 has been well maintained till the ninth year. Plot 10 had 6 cwt. 

 dissolved bones in 1897 and the same in 1900. These contained 

 the same amount of phosphoric acid as the superphosphate for 

 Plot 5, and in addition the former contained 34 pounds nitrogen 

 in the two dressings. The sheep have increased in liveweight 

 4 l / 2 pounds more per acre annually on this plot than where super- 

 phosphate was used, but owing to the less cost of the latter manure 

 the net gain per acre annually on this plot is only $2.86 an acre 

 as compared with $3.30 from superphosphate. The results also 

 show that the lasting effects of dissolved bones correspond very 

 closely to that of superphosphate. Both these manures gave their 

 best effects more quickly than slag, but did not give such good 

 results in the later years. Dissolved bones have not retained 

 clovers so well in the later years as superphosphate. 



"Plot 8 has had the same superphosphate as Plot 5, and in 

 addition 100 pounds sulphate of potash, for each of the years 

 1897, 1899 and 1903. The result has been an average increase 

 per acre annually of nearly 9 pounds live weight over Plot 5, 

 which has just paid the cost of the potash manure, but has given 

 no increase in the net profit. It is rather striking that the potash 

 manure has not at all increased the clover plants, as there have 

 been fewer of these here than on Plot 5, where superphosphate 

 only was used. There is evidently nearly sufficient potash in 

 'this clay soil to supply the pasture requirements, at any rate for 

 a considerable time. Plot 9 received the same superphosphate as 

 Plot 5, and in addition 4 cwt. sulphate of ammonia for each of 

 the years 1897, 1899, 1900 and 1903. As a result the average an- 

 nual increase in live weight has been reduced by 3 pounds an 



