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Articles by Wenjun Xie
Total Records ( 2 ) for Wenjun Xie
  Wenjun Xie and Jianmin Zhou
  Little is known about the effects of long-term fertilization on pesticide persistence. A long-term field experiment was thus conducted to study the influence of fertilization on soil physicochemical properties, microbial biomass carbon, microbial quotient, enzyme activities, and cypermethrin dissipation. Five fertilization treatments were arranged: organic manure (OM), NPK fertilizer, PK fertilizer, NK fertilizer, and no fertilizer (control). Soil organic C, N, P contents and enzymatic activities were higher in soils with balanced fertilization as opposed to those with unbalanced fertilization, especially fertilization with organic manure. The longest half-life of cypermethrin was in the NK treatment (15.1 d), the least in the PK treatment (9.6 d). Pesticide dissipation in non-sterilized and sterilized soils showed that changes of cypermethrin persistence were caused by biodegradation. Soil N/P ratio (ratio of soil-available N to available P) and available N content positively correlated with half-life (p<0.05), and could limit cypermethrin dissipation greatly. These results indicate that in agricultural practice, oversupplying N should not be advocated. P application may be an efficient way to decrease N/P ratio and enhance cypermethrin dissipation in soil with high available N content. Based on a comprehensive consideration of soil fertility, crop yield, and environment, a mixed application of organic manure and inorganic fertilizers is recommended in the region, although balanced fertilization results in slower cypermethrin dissipation than does N-deficiency treatment.
  Bo Guan , Junbao Yu , Zhaohua Lu , Wisdom Japhet , Xiaobing Chen and Wenjun Xie
  The main aim of this study is to detect the effects of NaCl, NaHCO3 and sea salt on seed germination, seedling growth and seedling cation contents of two Suaeda species. Three germination experiments of S. corniculata and S. salsa seeds were conducted in growth chambers. The seeds were placed at three types of salt at concentrations: 0, 25, 50, 75, 100% seawater; 0, 100, 200, 300, 400, 500 mM NaCl and 0, 100, 200, 300, 400, 500 mM NaHCO3, separately. The two species varied in their salt tolerance for germination rates and percentages and showed higher germination percentage at higher salt stress (500 mM NaCl, NaHCO3 and 100% seawater). Some un-germinated seeds were recovered after being transferred to distilled water. The Na+ content in seedlings increased with the increase in stress intensity. While K+ content and K+/Na+ ratio decreased under NaCl and NaHCO3 stress. K+ content increased in seawater treatment while reaching higher salt concentrations, due to the extra K+ in seawater, but there was no significant difference among the treatments with varied seawater concentrations (p<0.001). These results suggested that S. corniculata and S. salsa could be used as pioneer plants for ecological recovery and exploitation of saline and sodic soils.
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