EFFECT OF ORGANIC MANURE AND CHEMICAL FERTILIZER ON NITROGEN UPTAKE AND NITRATE LEACHING IN A EUM-ORTHIC ANTHROSOLS PROFILE

Distribution and accumulation of NO3-N down to 4 m depth in the soil p rofile of a long term fertilization experiment with organic manure and N and P chemical fertilizer were studied after 12 years, wheat and co rn were planted in each year. The apparent N recovery decreased with i ncreased N and P fertilizer. NO3-N was mainly accumulated in 0-1.2 m d epth of the soil profile with a maximum of 34 mg N kg(-1) for the trea tment with 120 kg N and 26 kg P per hectare, a secondary maximum of 7. 2 mg N kg(-1) was found at 3.2 m depth in the same treatment. NO3-N ac cumulation in the soil profile was minimized in the trials with highes t manure application. Nitrogen that was not recovered was leached as N O3-N deeper than 4 m depth, was immobilized in the profile or was lost by denitrification.