Lysimeter Experiments 



21 



rainfall was 1689.9 millimeters, or at the rate of 21.15 inches annually. 

 Of this the following percentages passed thru the soils: 



It would appear from these results that the loamy soils permitted of 

 greater percolation than the sandy soils. 



At the Bromberg Agricultural Institute lysimeter experiments were con- 

 ducted by Kriiger (1911) in 1910. The character of the soil is not stated. 

 Some of the lysimeters were kept bare of vegetation, others were planted 

 to rye. On the fallow soil 55 per cent of the rainfall percolated thru, 

 on the cropped soil from 20 to 25 per cent. The amount of rainfall is 

 not stated. 



At Jonkoping, in Sweden, lysimeter experiments were conducted by 

 Von Feilitzen, Lugner, and Hjerstedt (1912). The lysimeters each had a 

 surface area 80 centimeters square, and a depth of 50 centimeters. They 

 were all filled with muck soil containing about 60 per cent of organic 

 matter. During the first year of the experiments the soil in all was kept 

 bare of vegetation. In the following years one set of tanks was planted 

 to a rotation of crops and another set was kept in grass. The fallow soil 

 allowed 63 per cent of the rainfall to percolate, while 35 per cent passed 

 thru the soil that was cropped. The amount of rainfall is not stated. 



Experiments have been conducted in India with lysimeters similar 

 to those used at Rothamsted, England. Hayman and Burt (1906) report 

 that from June 1, 1904, to May 31, 1905, the rainfall at Cawnpore was 

 49.2 inches, and the percolation from one 6-foot gauge was 21.78 inches, 

 or 44.3 per cent of the rainfall. The percolation from the two 3-foot 

 gauges showed such a great discrepancy that year that the figures are 

 hardly worth quoting; but Burt and Leather (1909) report that for the 



2,1 



