CONTENTS 



PAGE 



I NTRODUCTION - ' 585 



REVIEW OF THE LITERATURE 590 



EXPERIMENTAL WORK 593 



Description of Procedure and Methods 594 



Effect of Magnesium and Calcium in Prepared Carbonates 

 and in Dolomite Upon Wheat and Alfalfa Grown in Sand 



(Series A and B) 596 



Effects of Calcium and Magnesium in Prepared Carbonates 

 and in Dolomite Upon Wheat and Alfalfa in Brown Silt 



Loam (Series C and D) 598 



Effect of Magnesium and Calcium in Dolomite, Magnesite, 

 and prepared Carbonates Upon Wheat and Alfalfa in 



Sand (Series E and F) '. 600 



Effect of Magnesium and Calcium in Calcareous Soil, Mag- 

 nesite, Dolomite, and Prepared Carbonates Upon Wheat 



and Alfalfa (Series G and H) 60 1 



Effect of Magnesite and Dolomite Upon Wheat and Soy- 

 beans (Series I and J) 605 



The Effect of Maximum Quantity of Calcium and Mag- 

 nesium Upon Wheat and Soybeans in Sand (Series K) 606 



Effect of Magnesium and Calcium in Sulphates, Chlorides, ' 

 and Carbonates Upon Wheat and Soybeans in Sand 



(Series L and M) 608 



Effect of Magnesium and Calcium in Calcareous Soil, Dolo- 

 mite, and Magnesite, After Alfalfa, Upon Soybeans 



( Series N ) 6 10 



DISCUSSION 613 



CONCLUSIONS 615 



LITERATURE CITED 6 1 6 



ILLUSTRATIONS ... 



