44 



RESULTS WITH WHEAT 



the rate of 400 Ibs. per acre, were applied alone, during four 

 years, to one plot in the autumn, and to another plot in the 

 spring : the results are shown in Table X. 



TABLE X. 



PRODUCE OF WHEAT GRAIN AT HOLKHAM, BY AUTUMN AND 

 SPRING APPLICATIONS OF AMMONIA SALTS. 



In this short experiment the advantage is most generally 

 with the autumn application. 



The most suitable time for the application of ammonia 

 salts clearly depends upon the character of the climate, and 

 no fixed rule can be given. The application must be made 

 early enough for the ammonia to become nitrified, and the 

 nitrates distributed through the soil, before the time that the 

 active growth of the crop commences ; no earlier application is 

 needed or desirable. 



4. Experiments at Woburn. The soil at Woburn in 

 Bedfordshire is a very fine sand, of considerable depth, and 

 good fertility, but containing as already mentioned only 

 very little lime. The experiments conducted by the Royal 

 Agricultural Society at this station include the continuous 

 growth of wheat and barley with manures similar to those 

 employed at Rothamsted. A report by Dr. Voelcker on the 

 results of these experiments during twenty years will be found 

 in the Journal of the Royal Agricultural Society, 1897, 2 5^' 



The ammonia salts employed are, as at Rothamsted, a 

 mixture of equal weights sulphate and chloride. The salts are 

 analysed, and the quantities applied supply every year 50 Ibs. 

 or 100 Ibs. of ammonia per acre. The ammonia salts have 



