38 



RESULTS WITH WHEAT 



in forty consecutive seasons ; the return here shown is by 

 no means all that the ammonia is capable of yielding. 

 When i cwt. of sulphate of ammonia produces 5 bushels 

 of wheat grain, and 5 cwts. of straw, rather less than 

 40 per cent, of the nitrogen of the ammonia salts are 

 found in the resulting crop, and under ordinary circumstances 

 the greater part of the remainder is lost. In a superior 

 climate, with a more equable supply of water in the soil, with 

 abundant sunshine, and no sudden variations in temperature, 

 the assimilating power of the crop is greatly increased, and 

 two-thirds or three-quarters of the nitrogen in the manure 

 may be found in the form of wheat grain and straw at harvest. 

 The character of the climate thus greatly influences the 

 amount of profit to be gained by the use of ammonia salts, and 

 applications may be made in one locality or season with great 

 profit which in another will result in loss. We cannot better 

 illustrate the great influence of climate on the return yielded 

 by ammonia salts than by contrasting the produce of wheat 

 obtained in Broadbalk field in the three best seasons during the 

 experiment with the average produce of forty years already given. 



TABLE VI. 



PRODUCE OF WHEAT PER ACRE IN BROADBALK FIELD. 

 AVERAGE OF THE THREE BEST SEASONS, 1854, ^S* 1894. 



The figures in Table VI. show that Plot 7, receiving 400 



