STUDY ON BEHAVIOUR OF CR FORMULATION OF THIOBENCANB IN A MODEL PADDY FIE

ＳＴＵＤＹＯＮＢＥＨＡＶＩＯＵＲＯＦＣＲＦＯＲＭＵＬＡＴＩＯＮＯＦＴＨＩＯＢＥＮＣＡＮＢＩＮＡＭＯＤＥＬＰＡＤＤＹＦＩＥＬＤＳｕｎＪｉｎｈｅ（孙锦荷）；ＬｉＸｉｎｇｍｉｎｇ（李兴明）；ＣｈｅｎＺｉｙｕａｎ（陈子元）ａｎｄＺｈａｎｇＱｉｎｚｈｅｎｇ（张...

STUDY ON BEHAVIOUR OF CR FORMULATION OF THIOBENCANB IN A MODEL PADDY FIELD

The fate of CR formulation of 14C--thiobencarb (thio.) was studied at the high rate of application in a model paddy field. Thio. could be released from the alginate formulation (TAL-17189) into water. The concentration of thio. in water increased with time, then declined. Thio. in water could be converted to more than 12 14C--degradation products which changed with time. An unknown degradation product (Mo) was always prevailing after application. Thio. in water could be adsorbed by soil particles. Most of the adsorbed thio. retained in upper layer. Thio. in soil could be also degraded tO more than 6 products. Thio. and its degradation products could conjugate with the compositions of soil to bound residues (BR). Thio. was 45.6 % of the toeal 14C--extractable residues (ER) in upper layer soil at harvest. 14C--thio. in water and soil could be uptaken by rice plants. Thio. in plants existed in ER and BR.Most of 14C--residues in straw, roots, brown rice and husk were in bound form, more than 92 % of the toeal 14C in them at harvest respectively. Thio. in plantS could be metabolized to more than 9 metsbolites which changed with time. 14C--thio. in straw,brown rice and husk accounted for 5588, 6.06 and 11.18 % of the total 14C-- ER of them at harvest respectively. An unknown 14C--metebolite in brown rice was prevailing,accounted for 63.03 % of the total 14C- ER.