196 



The part played by leguminous plants in fertilising the soil has 

 been the subject of many new researches at Woburn, and the re- 

 sults have been of great interest. 



Experiments have also been made with some non-leguminous 

 plants, such as rape and mustard, used as green manure and the 

 results have been so good as to raise the doubt that the nodule 

 theory of Hellriegel is not quite perfect. 



Besides the above mentioned many other subjects have been 

 investigated at Wobura such as the residual values of top dress- 

 ings, the laying down of grass lands, the improvement of old pas- 

 tures, the use of magnesia in potato growing, the growing of lu- 

 cerne, etc. 



J. AUGUSTUS VOELCKER. Pot-culture Experiments and on Inocul- 

 ation of Leguminous Crops, at Woburn, in 1908. Jour- 

 nal of the Roy. Agr. Soc. of England, Vol. 70, 1909, pp. 388-395). 



The work at the Pot-culture Station at Woburn of the Royal 

 Agr. Society of England, in 1908, embraced the following: 



1) The influence of lithium and potassium salts on wheat. 

 (Exp. with the Hill's Fund). 



2) Green manuring experiments. 



3) Experiments on the influence of magnesia in soils. 



4) " with fertilisers on fen-soil. 



5) " with the acid soil of plot 2 a -continuous barley. 



6) '* on the inoculation of leguminous crops. 



The influence of Lithium and Potassium salts on wheat. 



The salts of lithium used were the chloride, carbonate, sulphate 

 and nitrate, in a quantity supplying the soil with 0.00375 P er cent 

 of the metal lithium. Along with this experiment was a similar 

 one with the corresponding potash salts, in quantities to supply the 

 soil in each case with 0.0075 P er % of the metal potassium. The 

 seed germinated well. 



When the produce was weighed the following results were ob- 

 tained : 



