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Effects of NaCl salt on mineralization and nitrification of a silt loam soil in the North China Plain

International Journal of Agricultural and Biological Engineering 2009年第2期2卷 14-23页

作者： Huang Quanzhong Huang Guanhua Chinese-Israeli International Center for Research and Training in Agriculture China Agricultural UniversityBeijing 100083China Center for Agricultural Water Research China Agricultural UniversityBeijing 100083China

Low quality water has been widely used for irrigation all over the world due to water ***,the use of low quality water may cause accumulation of salt in root-zone soils,resulting in poor nitrogen utilization by *** objective of the present study was to investigate the effects of sodium chloride(NaCl)on mineralization and nitrification of soils in the North China Plain(NCP).The experiments were conducted with laboratory incubators at 30℃.Five levels of NaCl-salt concentrations 0%,2%,3%,5%and 8%in the added solutions were used in the soil samples collected from *** mineralization at NaCl-salt concentration lower than 3%was not significantly different from that of the control,whereas,significant inhibition of mineralization was found in the treatments with NaCl-salt concentration higher than 3%.The inhibition of mineralization was attributed to the retardation of nitrification in relatively high salt content because ammonification was not depressed by the added NaCl *** gas losses and nitrification were found decreasing with the increase in *** was also found that the nitrification was more sensitive to salinity than the *** of soil samples was inhibited by 44.72%,57.87%,and 83.64%compared with the control after 38 days of incubation at NaCl-salt concentrations of 3%,5%and 8%,*** time dependence of both the mineralization and nitrification can be fitted into a first-order kinetic *** rate constant of mineralization and nitrification decreased exponentially with the salt content in the *** results of the present research may provide some scientific implications for the use of saline water or treated sewage water in the farming regions of the NCP.

关键词： mineralization nitrification salinity silt loam soil

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Use of flue gas desulfurization gypsum to reduce dissolved phosphorus in runoff and leachate from two agricultural soils

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soil Ecology Letters 2023年第1期5卷 128-136页

作者： Yumei Mao Xiaoping Li Warren A.Dick Linkui Cao Shanghai Vocational College of Agriculture and Forestry Shanghai 201699China East China Normal University Shanghai 200241China The Ohio Agricultural Research and Development Center The Ohio State University WoosterOH 44691USA Shanghai Jiao Tong University Shanghai 200240China

Controlling dissolved phosphorus(DP)loss from high P soil to avoid water eutrophication is a worldwide high priority.A greenhouse study was conducted in which flue gas desulfurization gypsum(FGDG)was applied by using different application methods and rates to two agricultural *** fertilizer was incorporated into the soils at 2.95 g kg^(-1)to simulate soil with high P *** FGDG was then applied at amounts of 0,1.5,and 15 g kg^(-1)soil on either the soil surface or mixed throughout the soil samples to simulate no-tillage and tillage,*** was planted after treatment *** study showed that FGDG reduced runoff DP loss by 33%and leachate DP loss 38%in silt loam soil,and runoff DP loss 46%and leachate DP loss 14%in clay loam soil,at the treatment of 15 g kg^(-1)*** applied method(tillage)provided strong interaction with higher *** overall effect,the mixing-applied method performed better in controlling DP loss from silt loam soil,while surface-applied(no tillage)showed its advantage in controlling DP loss from clay loam *** practice it is necessary to optimize FGDG concentrations,application methods,and DP sources(runoff or leachate)to get maximized benefits of FGDG *** FGDG application had no negative effects on the soil and ryegrass.

关键词： Flue gas desulfurization gypsum(FGDG) silt loam soil Clay loam soil Dissolved phosphorus(DP) Application method Plant bioassay Trace element assessment

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