19.10.] The New Nitrogenous Fertilisers. 1007 



Experiments on Barley with Nitrogenous Fertilisers^ 

 Little Hoosfield, Rothamsted, 1909. 







Quantities per acre. 



Particulars of 

 Quality. 



0 



Manuring per acre. 

 336 lb. superphosphate, 

 50 lb. nitrogen. 



4 



br. 



Q ' 



c 

 '3 



bfl 



Q 



.5 



"c3 



ic 

 O 



.S 



'53 



bD 



"3 



0 

 H 



1 



1 . . 



1 £ 



a 



Is 

 0 



6 



0 



-a 

 p 



a 

 H 



Weight per 

 bushel of dressed 

 grain. 



Proportion of offal 

 to 100 dressed. 



Proportion of 

 grain to straw 

 as 100. 



I 



6 



\Superphosphatef 

 / alone. . .\ 



bush. 

 27-69 

 2969 



lb. 



1495 

 1640 



lb. 

 101 

 182 



lb. 

 1596 

 1822 



lb. 

 25 1 1 

 2727 



lb. 

 4107 

 4549 



lb. 

 54'o 

 55'3 



6-8 

 1 1 -i 



6 3 -6 



66-8 



2 

 7 



^ Superphosphate & / 

 / nitrate of soda . \ 



44-62 

 51-57 



2231 

 2830 



277 

 3i6 



2508 

 3146 



3429 



4334 



5937 

 7480 



50-0 

 54-9 



1 2 -4 

 1 1 2 



73'i 

 72-6 



3 



8 



) Superphosphate & / 

 / nitrate of lime . \ 



45-17 

 47-14 



2417 



2595 



364 

 321 



2781 

 2916 



4806 

 4091 



7587 

 7007 



53'5 

 55-i 



15-1 

 12-4 



57-9 

 7i-3 



4 

 9 



^ Superphosphate & / 

 / sulphate of ammonia \ 



49 '34 

 48-82 



2683 

 2673 



280 

 270 



2963 

 2943 



2943 

 4091 



5906 

 7034 



54H 

 54-8 



10-4 



ICTT 



100-7 

 71-9 



5 



10 



\ Superphosphate & / 

 / cyanamide . . \ 



43*86 

 46-48 



2388 

 2545 



182 



300 



2570 

 2845 



4469 

 3483 



7039 

 6328 



54'4 

 ; 54-8 



7-6 

 11 -8 



57 '5 

 81 - 7 



The initial poor condition of the land is seen in the large 

 return from the nitrogenous fertilisers, which increased the 

 yield from about 28J bushels of grain to over 47 bushels, 

 taking the average of the eight plots receiving nitrogen. The 

 duplicate plots agree fairly well with one another except in 

 the case of the nitrate of soda plots, where the difference is 

 rather great, though not perhaps more than may normally be 

 expected. One of the sulphate of ammonia plots also gives 

 too low a yield of straw ; this is probably a real error, due to 

 bad cutting of the laid and twisted straw. 



The sulphate of ammonia plots give slightly the best 

 results as regards grain, but the differences between the plots 

 receiving sulphate of ammonia, nitrate of soda, and nitrate 

 of lime are all within the limits of experimental error, and 

 the yield of grain may be taken as approximately the 

 same for each fertiliser. On the permanent barley plots at 

 Rothamsted, ammonium salts give over a lengthy period the 

 same average results as nitrate of soda. 



The average yield with cyanamide is a little below that with 

 the other fertilisers, 45*2 bushels against 47*5, a difference of 

 a little more than 5 per cent. Taking the series of plots 



