Degradation of Bt protein in soil released from Bt corn stalks and comparison of its simulation models

Abstract

Abstract: The soil degradation of Bt protein from stalks of 4 Bt corn hybrids(34B24,NK58-D1,R?601 RR/YG and Nongda61)were compared and the first-order kinetic model,biexponential model and shift-log model were used to fit the degradation data set in this study.The results showed that the degradation of Bt protein of all 4 hybrids in soil demonstrated a two-stages pattern,a rapid decline in 14 days and then stable at low concentration for a long time.Both the biexponential model and shift-log model fitted the decay pattern of Bt protein much better than the first-order kinetic model.However,model selection should not only be based on the statistic significant index of the model fitting,but also on the deviation between each simulated value and observed value.It was necessary to increase sampling frequently in the rapid degradation stage so as to make a scientific judgment about the accuracy of DT₅₀ and DT₉₀ calculated from models.

Key words: Methanogens, Methanotrophs, Nitrifiers, Denitrifiers, CH₄, N₂O

CLC Number:

X705

WANG Jianwu, FENG Yuanjiao. Degradation of Bt protein in soil released from Bt corn stalks and comparison of its simulation models[J]. cje, 2005, (9): 1063-1067.

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