Plate 1. — Growth of mustard on limed soil Qcf. 

 page 24). — a, first cultivation; h, second cultivation; 

 c, second cultivation after leaching. — From left to right: 

 0, 4.8, 9.6, 19.2, 28.8, 38.4, 72, 144 gs CaCOa per pot. 



