ON THE GROWTH OF LEGUMINOUS CROPS. 7 



results given in Table III. (below), which show the amounts of 

 nitrogen in the crops grown in the experimental rotation at Rothamsted, 

 for which a full manure, both mineral and nitrogenous, is applied for 

 the Turnips commencing each course. The whole of the crops, roots 

 and leaves in the case of the Turnips, and both corn and straw in that 

 of the Cereals and the Beans, are removed from the land, and the 

 figures show the average amounts of nitrogen in the crops over 8 

 courses in each case, that is over a period of 32 years in all. 



TABLE III. 



Yield of Nitrogen in Crops grown in four-course rotation, with artificial mineral and 



nitrogenous manures. 

 8 courses, 32 years, 1852-1883. 



If we compare the amounts of nitrogen in these crops, for which 

 nitrogenous as well as mineral manures were applied, with those 

 obtained in a corresponding rotation but without nitrogenous manure, 

 as shown in Table I. (p. 3), it is seen that every one of the crops, 

 the Roots for which the manure was directly applied, the Cereals, and 

 the Leguminous crops, all yield much more nitrogen than when no 

 nitrogenous manure was applied. The amounts of nitrogen obtained 

 in the Cereals are about the same as, or perhaps rather less than, in 

 average good crops grown in ordinary farm practice. The amounts 

 obtained in the Turnips are also perhaps rather less than in average 

 good crops, and considerably less than in a good crop of Mangel- 

 Wurzel. The amounts in the Beans are also less than in a good crop 

 of Beans, grown on suitable Bean-land, but the amounts in the Clover 

 are more than in the average of crops grown in ordinary rotation. 



Taking the results as they stand, it is seen that, both the Roots and 

 the Leguminous crops accumulate much more nitrogen than either of 

 the Cereals grown in alternation with them. Lastly, whilst the average 

 yield of nitrogen, per acre per annum, over 32 years was, without 

 nitrogenous manure only 38 -6 Ibs. (see Table I.), it is, with nitrogenous 

 manure, 63*6 Ibs. ; and compared with this latter amount, it may be 

 mentioned that, in a similarly manured rotation, but with fallow instead 

 of a leguminous crop in the third year, the annual yield of nitrogen 

 was only 39 -9 Ibs. 



