Abstract: In 2004 and 2005, a field experiment was conducted in a peach orchard in Pinggu District of Beijing to study the effects of organic manure on the profile distribution of nitrateN in soil. Four treatments were installed, i.e., applying 6.75×10⁴ kg·hm^-2 of organic manure both in 2004 and in 2005 (T₁), no fertilization in 2004 but applying 13.5×10⁴ kg·hm^-2 of organic manure in 2005 (T₂), no fertilization in 2004 but applying 6.75×10⁴ kg·hm^-2 of organic manure in 2005 (CK), and no fertilization both in 2004 and in 2005 (CK). In 2006, soil samples at the depth of 0-120 cm were collected from the treatments and analyzed. The results showed that soil nitrate-N had a relatively uniform distribution in the profile in CK, accumulated more at the depth of 0-60 cm and decreased gradually at 60-120 cm in T₁ and T₃, and increased with increasing depth, with the peak at the depth of 100-120 cm in T₂. The soil nitrate-N content below 60 cm in T₂ was the highest among all the treatments, indicating that applying excessive amount of organic manure could induce nitrate-N leaching. The profile distribution of soil nitrate-N had significant correlations with the total amount of applied organic manure, the amount of organic manure applied in the nearest year, and the distance of sampling sites from peach tree. A correlation model of organic manure treatments and soil nitrate-N distribution was established.

Key words: tea seed meal, EDTA, sugarcane, Ni, Zn, accumulation.