LIST OF TABLES 



Table 1.— Leaching of diflFerently limed soils 23 



Table 2.— The influence of increasing amounts of potassium hydrate 



and quicklime on the development and yield of grain from oats . 28 

 Table 3.— EflFect of adding different groups of micro-nutrients on the 



growth of lettuce plants in culture solution 34 



Table 4.— Copper content of wheat, grown on different soils . . 42 

 Table 5.— Copper content of five weeks old oat plants (stems and 



leaves) ^3 



Table 6.— Effect of increasing amounts of molyhdenum on the yield 



of Aspergillus niger in a medium with nitrate-N 46 



Table 7— Effect of molybdeniun on denitrification 47 



Table 8.— Effect of molybdenum on the nitrate reduction in tomato 



plants 48 



Table 9.— Effect of molybdenum on the nitrogen fixation by the 



nodules of pea plants 49 



Table 10.— Variations in copper, iron, and manganese content of 



samples analyzed 53 



Table 11. -Relation of the ash content of plants to the heavy metal 



content of ash in some plant leaves 54 



Table 12.— Sterile water culture experiments with peas .... 55 

 Table 13.— Copper-deficient peas from copper-deficient seed . . . 56 

 Table 14.— Effect of manganese addition on the heavy metal content 



of manganese-deficient peas 58 



Table 15.— Relations between copper, manganese and iron in plants 58 



Table 16.— Experiments with manganese sulphate 89 



Table 17.— Copper analyses of fertilizers 91 



Table 18.— Increases in yield with different copper fertilizers . . 92 

 Table 19.— A liming and fertilizing experiment conducted in 1937 



on light clay 100 



Table 20.— Liming and fertilizing experiments in 1937-1939 on light 



clay 101 



Table 21.— Liming experiments in 1938-1939 on light clay . . . 102 



Table 22.— Action of trace elements on enzymes 123 



Table 23.— Copper content of 55 samples of liver originating from 



normal female catde 127 



Table 24.— Absorption of radioactive copper by the liver following in- 

 travenous injection in calves 128 



Table 25.— Intravenous injection of copper glycinate in horses . . 129 

 Table 26.— Copper content of samples of liver originating from 



horses ^30 



Table 27.— Manganese content of pasture grass in relation to the 



occurrence of grass tetany 132 



