338 The Wohurn Pot-Culture Experiments, 1910-11-12. 



value at Is. (ic?. per quarter more than the untreated. The 

 analysis made of the grain showed that the magnesia treated 

 lot was distinctly more nitrogenous than the " mitreated." 



In this experiment we thus obtained, on a more practical 

 scale, and by growing wheat, not in pots, but on open ground, 

 complete confirmation of the results obtained in pot-culture, 

 and these showed clearly that the addition of magnesia to a 

 soil poor in it, so long as the soil retains excess of lime, will 

 increase the yield of wheat. 



It is now intended to extend this work by carrying it out 

 on a field scale. 



General Conclusions. 



The work done up to the present has led to the following 

 general conclusions : — 



(1) That magnesia may, with advantage to the wheat plant, 

 be added to a soil poor in magnesia, so long as the amount of 

 magnesia in the soil does not exceed that of lime. 



(2) That, as the ratio of lime to magnesia approaches 1 : 1 

 a benefit will continue to accrue, but that if magnesia be in 

 excess, a toxic influence will be exercised and the crop be 

 diminished. 



(3) That soils in which magnesia is in excess of lime will 

 not give fully satisfactory results as regards corn-growing, l)ut 

 will be benefited by the addition of lime. 



(4) That lime used in excess does not possess the toxic 

 influence which magnesia, similarly used, has. 



(5) That magnesia and lime alike are capable of modifying 

 the growth of the wheat plant, altering the nature and extent 

 of the root development and the character of the grain. These 

 modifications are mainly shown in the stronger and greener 

 appearance of the flag, the production of a much developed and 

 very fibrous root growth, and the greater assimilation of 

 nitrogen resulting in the obtaining of a more glutinous grain. 



CALF-REARING EXPERIMENT, 1912. 



An experiment was begun at the Woburn Farm in the 

 spring of 1912 on the best way of rearing calves from birth. 

 A general summary of this and the results till then obtained 

 was published in the Proceedings of the Council for November 

 6, 1912, and found its way into most of the agricultural papers. 

 This experiment is, however, not yet concluded, and the report 

 on it will be issued at a later date. 



J. Augustus Yoblckbr. 



1. Titdov Street, K.C. 



