RESIDUES LEFT BY LEGUMINOUS CROPS 143 



sainfoin, white clover, red clover, and vetches ; the same plot 

 being always re-seeded when necessary with the same legumi- 

 nous plant. The results are described in detail in the 

 "Memoranda," and Table LIII. shows typical results in the 

 earlier and later years of the experiment. 



At first a fair growth of some of the plants was obtained 

 on the land which had ceased to carry red clover, but in later 

 years the growth of any but the powerfully-rooting lucerne and 

 Bokhara clover became very poor, and repeated failures to 



TABLE LIII. Hoos Field, Leguminous Experiments. Dry Matter in 

 produce per acre per annum. Mean of Plots 4, 5, and 6. 



* Plot 4 only. 



obtain a plant occurred on re-seeding. The land itself got 

 very foul and in a poor mechanical condition ; so that in 1898 

 the greater part of the land under experiment was sown with 

 wheat without manure, only a portion of each plot being 

 retained for continuous experiment. 



Five successive crops of wheat were taken and harvested 

 separately from each of the old plots, the combined result 

 from the various plots which had previously carried the same 

 leguminous plant being put together in the Table LIV. It 

 will be seen that all the leguminous crops left a large residue 

 containing nitrogen in the soil, so that the crop of wheat 



