To grasp the characteristics of Pb, Cd, Cu and Zn in mulberry garden soil in Longchuan County, Yunnan Province, the single-factor pollution index method and multi-factor pollution index method were used to analyze the...To grasp the characteristics of Pb, Cd, Cu and Zn in mulberry garden soil in Longchuan County, Yunnan Province, the single-factor pollution index method and multi-factor pollution index method were used to analyze the environmental quality of mulberry garden soil. The results showed that the Zn content in mulberry soils did not exceed normal water based on the soil pollution risk control standards for agricultural land, but the Cd content was high. The single factor pollution index of Pb and Cu did not exceed 2, and the exceedance rate of points was 16% and 24% respectively, while the single factor pollution index of Cd exceeded 3. The pollution of heavy metal Cd existed in the soil of mulberry garden. The average Pi values of soil heavy metals were ranked as Cd > Cu > Zn > Pb. Heavy metal combined pollution index of 6.58, pollution level of heavy pollution. Principal component analysis (PCA) of the four heavy metals showed that the two elements, Pb and Cu, were strongly correlated in their spatial distribution. Longchuan County mulberry soil heavy metal environmental quality evaluation, for the safe use of soil to provide a scientific reference basis.展开更多
[Objective] The paper was to screen the pesticides with good control effects against pests in mulberry and small impact on silkworm. [Method] The combined method of indoor toxicity test, field efficacy test, fast test...[Objective] The paper was to screen the pesticides with good control effects against pests in mulberry and small impact on silkworm. [Method] The combined method of indoor toxicity test, field efficacy test, fast testing of pesticide residues and residual toxicity determination were adopted to carry out test. [ Re- suit] Indoor toxicity results showed that LC50 of mulberry No. 1 against Hyalopterus amygdale was （316.1±57.3） mg/kg, and the control effect of mulberry No. 1 at 14 d reached 62.58% ; fast testing of pesticide residues at 7 d showed that the mulberry leaves were safe to silkworms, which reached the standard of leaves for silkworm. [ Conclusion] Mulberry No. 1 was recommended to be the Special pesticide to apply in mulberry field.展开更多
文摘To grasp the characteristics of Pb, Cd, Cu and Zn in mulberry garden soil in Longchuan County, Yunnan Province, the single-factor pollution index method and multi-factor pollution index method were used to analyze the environmental quality of mulberry garden soil. The results showed that the Zn content in mulberry soils did not exceed normal water based on the soil pollution risk control standards for agricultural land, but the Cd content was high. The single factor pollution index of Pb and Cu did not exceed 2, and the exceedance rate of points was 16% and 24% respectively, while the single factor pollution index of Cd exceeded 3. The pollution of heavy metal Cd existed in the soil of mulberry garden. The average Pi values of soil heavy metals were ranked as Cd > Cu > Zn > Pb. Heavy metal combined pollution index of 6.58, pollution level of heavy pollution. Principal component analysis (PCA) of the four heavy metals showed that the two elements, Pb and Cu, were strongly correlated in their spatial distribution. Longchuan County mulberry soil heavy metal environmental quality evaluation, for the safe use of soil to provide a scientific reference basis.
基金Supported by Education Science Foundation of Guangxi Education Department(GJKY[2007]No.34)~~
文摘[Objective] The paper was to screen the pesticides with good control effects against pests in mulberry and small impact on silkworm. [Method] The combined method of indoor toxicity test, field efficacy test, fast testing of pesticide residues and residual toxicity determination were adopted to carry out test. [ Re- suit] Indoor toxicity results showed that LC50 of mulberry No. 1 against Hyalopterus amygdale was （316.1±57.3） mg/kg, and the control effect of mulberry No. 1 at 14 d reached 62.58% ; fast testing of pesticide residues at 7 d showed that the mulberry leaves were safe to silkworms, which reached the standard of leaves for silkworm. [ Conclusion] Mulberry No. 1 was recommended to be the Special pesticide to apply in mulberry field.
