[NO3(-)-N leaching and distribution in soil profile in dry highland of Loess Plateau under long-term fertilization].
The NO3(-)-N accumulation and distribution in soil profile of Loess Plateau dry highland were studied by long-term field trials. The results showed that NO3(-)-N was accumulated in the soil profile under N-fertilization. Application of P-fertilizer or organic manure reduced the NO3(-)-N content and its leaching depth in the soil profile. The deepest depth of NO3(-)-N accumulation was 120-200 cm under N treatment, and the peak of the accumulation was the highest in NPM treatment, with the depth of 60-120 cm. The NO3(-)-N accumulation depth was 80-140 cm for NP. Without nitrogen application, there was no evident accumulation of NO3(-)-N in soil profile. The more nitrogen used, the more NO3(-)-N accumulated in soil profile. Under the same nitrogen application rate, NO3(-)-N accumulation might decrease with increasing P application.
Dang
Tinghui
T
Institute of Soil and Water Conservation, Chinese Academy of Sciences, Institute of Soil and Water Conservation, Northwest Science-Technology University of Agriculture and Forestry, Yangling 712100, China. dangth@nwsuaf.edu.cn
Guo
Shengli
S
Fan
Jun
J
Hao
Mingde
M
D005308:Fertilizers; D009566:Nitrates / Q000032:analysis*; D009584:Nitrogen / Q000032:analysis*; D012987:Soil / Q000032:analysis*
D005308:Fertilizers; D009566:Nitrates; D012987:Soil; D009584:Nitrogen