[Effects of organic manure on the profile distribution of soil nitrate-N in a peach orchard].
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 x 10(4) kg x hm(-2) of organic manure both in 2004 and in 2005 (T1), no fertilization in 2004 but applying 13.5 x 10(4) kg x hm(-2) of organic manure in 2005 (T2), no fertilization in 2004 but applying 6.75 x 10(4) kg x 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.
Wang
Yan-Ping
YP
College of Agronomy and Biotechnology, China Agricultural University, Beijing 100094, China. eco_wangyp@126.com
Gao
Ji-Xi
JX
Liu
Shang-Hua
SH
Du
Xiang-Ge
XG
D000818:Animals; D002681:China; D017753:Ecosystem; D005308:Fertilizers; D008372:Manure; D009566:Nitrates / Q000032:analysis*; D009584:Nitrogen / Q000032:analysis*; D027861:Prunus / Q000254:growth & development*; D012987:Soil / Q000032:analysis*; D012989:Soil Pollutants / Q000032:analysis
D005308:Fertilizers; D008372:Manure; D009566:Nitrates; D012987:Soil; D012989:Soil Pollutants; D009584:Nitrogen