ON THE GROWTH OF LEGUMINOUS CROPS. 



17 



vention of Fallow, further illustrates the fact that the previous failures 

 were not wholly due to exhaustion. 



The next Table, VII. (below), shows the amounts of nitrogen in 

 the Bean crops, the produce of which we have been considering. 



TABLE VII. 

 BEANS. 



Grown year after year on the same land, with different Manures, in Geescroft 



Field, Rothamsted. 

 Yield of Nitrogen, Ibs. Average per acre, per annum, 8-year periods. 



Average per acre per annum, over each period of 8 years, and the total period of 



32 years. 



(1) 5 years, 1847-1851, 46 Us. Nitrogen as Ammonium Salts ; 11 years, 1862, 1864-1870, 1875, 

 1876, and 1878, 86 Ibs. Nitrogen as Sodium Nitrate. (2) 7 years, excluding 1849. (3) 31 years, 

 excluding 1849. (4) 7 crops, excluding 1849. (5) 25 crops, excluding 1849. 



GENERAL NOTE. In the second 8 years, the land was fallow in 1860, and wheat was grown in 

 1861 ; in the third 8 years, 1863 was fallow ; and in the fourth 8 years, the crop failed in 1871, and 

 the land was lef fallow in 1872, 1873, and 1876. 



The Table is on the same plan as that relating to the produce, but 

 instead of results for every year of the 32, there are now given only 

 averages, in the upper division for the four 8 yearly periods, and for the 

 total period of 32 years ; and in the lower division for the years of 

 crop only, within each period. As in Table VI., the first three columns 

 give for each of the three conditions as to manuring, the results for the 

 corn, the second three for the straw, and the last three for the total 

 produce, corn and straw together. It will suffice to direct attention to 

 these last results. 



Keferring to the figures in the upper division, it may be observed 

 that, notwithstanding there were 6 blank years, and 1 year of wheat, 

 out of the 32, and notwithstanding that the produce declined much, 

 and gave on the whole much less than the average obtained under 

 ordinary agricultural conditions, yet the average yield of nitrogen in the 



