[Desorption characteristics of inorganic nitrogen in vegetable garden soil and their effects on soil NO3- -N loss potential].
With pot experiment and soil nitrogen desorption model, this paper studied the characteristics of nitrogen desorption in vegetable garden soil, and their effects on the NO3- -N concentration of soil leachate. The results showed that soil leachate NO3- -N concentration had a non-linear relationship with the parameters Q, Cli and C1/lamda of soil nitrogen, but the relationship became linear when these eigenvalues were relatively low. A conception of hi-curve cross point was put forward to assess the soil NO3- -N loss potential. When the eigenvalues were higher than the hi-curve cross point X0, the NO3- -N concentration in soil leachate would be increased rapidly in non-linear form, while on the contrary, the increase would be maintained at a lower level.
Yan
Ming-juan
MJ
Institute of Soil and Fertilizer, Fujian Academy of Agricultural Sciences, Fuzhou 350013, China. yanmj163@163.com
Zhang
Ming-qing
MQ
Chen
Zi-chong
ZC
Li
Juan
J
Lin
Qiong
Q
Wu
Qi-tang
QT
Xiong
De-zhong
DZ
D000327:Adsorption; D005308:Fertilizers / Q000032:analysis; D009566:Nitrates / Q000032:analysis*; D009584:Nitrogen / Q000032:analysis* / Q000737:chemistry; D011891:Rain; D012987:Soil / Q000032:analysis*; D014675:Vegetables / Q000254:growth & development*
D005308:Fertilizers; D009566:Nitrates; D012987:Soil; D009584:Nitrogen