The effects of PH3 fumigation with combined CA are shown inFig. 2. The mortality of thrips varied at different exposure durationsand concentrations of CO2 and oxygen. For fumigation with CO2 atconcentrations of 1%, 2%, 5%, 8%, 10 V, and 12%, the correspondingoxygen concentrations were 20.66%, 20.53%, 19.85%, 19.22%, 18.77%and 18.36%, and ratios of concentration of CO2 to oxygen changedfrom 0.048 to 0.65. As concentrations of CO2 increased and oxygenreduced at fixed exposure duration, the mortality of thrips alsoincreased. Changes of mortality were well fitted to a polynomialequation: Mortality (%) = 55.84 + 1.19t + 112.05r−1.97tr−65.55r2(t represents duration and r represents the ratio of concentrationof CO2 to oxygen), with R2 of the total model 0.94 and theresult of the F test (<0.0001) was significant (Table 3). There weresignificant negative effects for interaction between exposure durationsand ratios of concentration of CO2 to oxygen on mortalityrates. Factors including t, r, r2 and tr significantly affected mortalityrates, and tr was the least important among these factors,as (values of t test of t, r, r2 and tr were 0.0012, 0.0001, 0.0192,0.0038 respectively), and ratios of concentration of CO2 to oxygencontributed more than exposure duration in the synergistic
การแปล กรุณารอสักครู่..
