Cloud asked in 社會與文化語言 · 8 years ago

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The supposition that phosphate accumulation in soil might result in reduced

glyphosate retention capacity and thus increased leaching risk is mostly obtained

from many batch experiments, rather than column experiments that may simulate actual field conditions better. However, we hypothesize that: (1) phosphate application might induce system pH decrease, and (2) the overall glyphosate mobility by phosphate application might depend on the relative contribution of two competing processes: increase in glyphosate adsorption from pH decrease versus reduced

glyphosate adsorption from competitive adsorption between phosphate and

glyphosate for sorption sites available. To test these two hypotheses, laboratory

batch and column experiments using a miscible displacement approach were

conducted on two Primosols and one Anthrosols,to investigate, respectively,

(1) pH dependent glyphosate adsorption onto the three studied soils, and (2)

glyphosate leaching and mobility in soil columns as influenced by phosphate

application. Our results showed that glyphosate adsorption consistently

decreased with increase in system pH.

1 Answer

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  • 晚風
    Lv 5
    8 years ago
    Favorite Answer

    土壤中磷酸鹽的堆積導致嘉磷賽滯留能力的降低並因此提高流失風險的推定,主要來自於許多的批次實驗,而非來自於較能模擬實際狀況的管柱實驗。然而,我們推論:(1)磷酸鹽的應用可能誘使系統PH值降低,而且(2)施用磷酸鹽情況下的整體嘉磷賽流動性可能端賴兩個競爭程序的相對屬性而定:(因PH值降低所帶來的嘉磷賽吸收增加)相對於(可吸附處磷酸鹽與嘉磷賽間的吸附競合造成的降低)。為了檢定這兩個推論,我們利用混合置換法分別對兩種新成土和一種人為土進行批次與管柱實驗,以研究(1)三種土壤上PH值相關的嘉磷賽吸附量,以及(2)磷酸鹽影響下土柱試樣裡的嘉磷賽流失與流動性。我們的結論證實嘉磷賽吸附量的降低與系統PH值的上升相一致。

    Source(s): Nightwind
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