Vertical Leaching Character of N and K Element in Latosol Developed from Sandshale
The objective of this study was to investigate the vertical movement characteristics of N,K in Latosol developed from sandshale.The samples with fertilization treatment of soil solution at vertical depths(20、 60、100、 200 cm)underground and the control with no fertilization soil were collected with a huge field infiltration equipment.The changes on the concentration of nitrate nitrogen,ammonia nitrogen and K+ were studied continuously for more than 7 months.The results showed that fertilization could intensify vertical leaching of ammonia nitrogen,nitrate nitrogen and K element in the soil,but no significant influence on vertical leaching depth of nitrate nitrogen,while the depth nitrate nitrogen moving to underground was 200 cm in 105 days,and that for ammonia nitrogen and K element was 60 cm in 49～76 days,20 cm in 12～17 days,respectively.