38 



weight per bushel of the corn, recorded over a long series 

 of years both at Rothamsted and at Woburn, and by 

 similar results which will be noticed in connection with 

 other crops. 



For wheat, therefore, the results of these experiments 

 seem to show that there is not much difference in the bulk 

 of the corn produced by a given amount of nitrogen in the 

 manure, whether in the form of ammonia salts or nitrate of 

 soda ; but the quality of the corn is distinctly better from 

 ammonia salts. Both at Rothamsted and Woburn, the 

 average rainfall is lower than in many parts of the country ; 

 and therefore the results obtained are perhaps on that 

 account more favourable to nitrate than would be the case 

 in moister climates. 



The amount of straw, on the other hand, is greater with 

 nitrate of soda, though any advantage in this is counter- 

 balanced by the crop's greater liability to be laid, and less 

 power to resist mildew. If too much nitrogen be applied, 

 either in comparison to the mineral plant food present in 

 the soil, or to the plant's requirements, harm is more likely 

 to result when nitrate is used than with ammonia salts. 



SULPHATE FOR WHEAT IN ROTATION. 

 As to the best way of using sulphate of ammonia for 

 wheat under the conditions of ordinary farming, some light 

 is afforded by the experiments of the Norfolk Chamber of 

 Agriculture in 1888."- These were carried out at three 

 centres ; but the results of two stations only will be con- 

 sidered at present, for at the third Flitcham no mixture 

 of manures which did not contain potash was effective, so 

 that the inclusion of its results would only serve to mask 

 those of the other two stations for our present purpose. 

 The following table shows the average yield per acre at the 

 two stations, Whitlingham and Cawston : 



TABLE XVII. 



Manuring. Corn. Straw. 



Bush. 



1 cwt. sulphate of ammonia, sown in autumn . 23-92 



2 cwt. sulphate of ammonia, sown in autumn . 23-13 

 2 cwt. sulphate of ammonia, half sown in 



autumn, half in spring 24-93 



No manure 22-67 



Cwt.Qrs.Lbs. 



17 2 16 

 16 2 19 



18 2 

 16 1 14 



In the first place, as explaining the small increase 

 obtained by any of these manurings, it should be mentioned 

 that the season was on the whole unfavourable to their 



* " Journal of the Eoyal Agricultural Society of England," Vol. XXV., 

 S. S., Part 1. 



