MOVEMENTS OF SALTS IN SOILS. 71 



as to cause the differences observed. Time enough did, how- 

 ever, intervene between the start and the last series to permit 

 considerable changes of a biological character to take place ; but 

 the associated changes which were observed to have occurred, 

 in the water content of the soils, were usually in the direction 

 which would explain the observed changes in the amounts of 

 nitrates had they resulted from translocation by capillarity. 



IN NORFOLK SANDY SOIL. 



A field on the Norfolk Sandy Soil had been planted to peas 

 the latter part of January, 1902, in rows 3.5 feet apart, under 

 which had been applied 500 Ibs. of guano together with stable 

 manure at the rate of 50 bushels per acre, both drilled in the 

 furrows before planting. The fertilizer applied carried the 

 manufacturer's guarantee to contain 5 per cent, potash, 5 per 

 cent, ammonia, and 8 per cent, of phosphoric acid. In 1901 

 this field had been given an application of guano, drilled under 

 cotton rows, at the rate of 1,000 Ibs. per acre. 



On May 5, just as the .peas 1 were approaching the stage of 

 maturity for picking, samples of soil were taken, in one-foot sec- 

 tions, to a depth of four feet, both under and between the rows; 

 the cores of the respective composites being taken in pairs im- 

 mediately adjacent, one under and the other between the rows. 

 Two sets of these samples were taken at this time, one where 

 the peas were large and vigorous and the other where they were 

 smaller. In the next table are given the results found. 



