0 ) P : 000-0 Year: Type: ARTICLE Literature: oryza Field: abstract Doc ID: pub00000000 Accession (PMID): 00000000 Abstract: This paper reports a study of the distribution of organo-chlorine pesticides ( DDT and HCH ) between rice plants and the soil system by spraying before the heading stage at four different dosage levels--control , normal dosage ( 00 kg ha ( -0 ) of 0% HCH and 0 . 0 kg ha ( -0 ) of 00% DDT ) , double dosage and four times dosage . Soil and plant samples were taken respectively at the 0st h , 0rd , 00th , 00th , and 00th day after spraying and at the harvest time . The results indicate that less than 0% of HCH and 00% of DDT were absorbed by the surface of rice leaves for normal dosage . Most of both pesticides moved into the soil in solution after spraying . Compared with DDT , HCH was degraded and run off more easily . HCH residues in the surface soil layer ( 0-0 cm ) were already below 0 . 0 microg kg ( -0 ) at the mature stage , lower than Chinese Environmental Quality Standard for Agricultural Soils : HCH < 0 . 00 mg kg ( -0 ) . However DDT residues in the surface soil layer remained 000 microg kg ( -0 ) , higher than the national standard : DDT < 0 . 00 mg kg ( -0 ) . According to the test f OCP residues in rice seeds , it can be concluded that the OCP sprayed onto the surface of rice leaves can move into rice plants and accumulate in the seeds at the mature stage . HCH residues in rice seeds of the double and four times dosage treatments , and DDT residues in all treatments , exceeded the Chinese National Food Standard ( HCH < 0 . 00 mg kg ( -0 ) , DDT < 0 . 00 mg kg ( -0 ) ) . Matching Sentences: [ Sen. 0, subscore: 0.00 ]: This paper reports a study of the distribution of organo-chlorine pesticides ( DDT and HCH ) between rice plants and the soil system by spraying before the heading stage at four different dosage levels--control , normal dosage ( 00 kg ha ( -0 ) of 0% HCH and 0 . 0 kg ha ( -0 ) of 00% DDT ) , double dosage and four times dosage . Soil and plant samples were taken respectively at the 0st h , 0rd , 00th , 00th , and 00th day after spraying and at the harvest time . The results indicate that less than 0% of HCH and 00% of DDT were absorbed by the surface of rice leaves for normal dosage . Most of both pesticides moved into the soil in solution after spraying . Compared with DDT , HCH was degraded and run off more easily . HCH residues in the surface soil layer ( 0-0 cm ) were already below 0 . 0 microg kg ( -0 ) at the mature stage , lower than Chinese Environmental Quality Standard for Agricultural Soils : HCH < 0 . 00 mg kg ( -0 ) . However DDT residues in the surface soil layer remained 000 microg kg ( -0 ) , higher than the national standard : DDT < 0 . 00 mg kg ( -0 ) . According to the test f OCP residues in rice seeds , it can be concluded that the OCP sprayed onto the surface of rice leaves can move into rice plants and accumulate in the seeds at the mature stage . HCH residues in rice seeds of the double and four times dosage treatments , and DDT residues in all treatments , exceeded the Chinese National Food Standard ( HCH < 0 . 00 mg kg ( -0 ) , DDT < 0 . 00 mg kg ( -0 ) ) . [ Sen. 0, subscore: 0.00 ]: This paper reports a study of the distribution of organo-chlorine pesticides ( DDT and HCH ) between rice plants and the soil system by spraying before the heading stage at four different dosage levels--control , normal dosage ( 00 kg ha ( -0 ) of 0% HCH and 0 . 0 kg ha ( -0 ) of 00% DDT ) , double dosage and four times dosage . Soil and plant samples were taken respectively at the 0st h , 0rd , 00th , 00th , and 00th day after spraying and at the harvest time . The results indicate that less than 0% of HCH and 00% of DDT were absorbed by the surface of rice leaves for normal dosage . Most of both pesticides moved into the soil in solution after spraying . Compared with DDT , HCH was degraded and run off more easily . HCH residues in the surface soil layer ( 0-0 cm ) were already below 0 . 0 microg kg ( -0 ) at the mature stage , lower than Chinese Environmental Quality Standard for Agricultural Soils : HCH < 0 . 00 mg kg ( -0 ) . However DDT residues in the surface soil layer remained 000 microg kg ( -0 ) , higher than the national standard : DDT < 0 . 00 mg kg ( -0 ) . According to the test f OCP residues in rice seeds , it can be concluded that the OCP sprayed onto the surface of rice leaves can move into rice plants and accumulate in the seeds at the mature stage . HCH residues in rice seeds of the double and four times dosage treatments , and DDT residues in all treatments , exceeded the Chinese National Food Standard ( HCH < 0 . 00 mg kg ( -0 ) , DDT < 0 . 00 mg kg ( -0 ) ) . [ Sen. 0, subscore: 0.00 ]: This paper reports a study of the distribution of organo-chlorine pesticides ( DDT and HCH ) between rice plants and the soil system by spraying before the heading stage at four different dosage levels--control , normal dosage ( 00 kg ha ( -0 ) of 0% HCH and 0 . 0 kg ha ( -0 ) of 00% DDT ) , double dosage and four times dosage . Soil and plant samples were taken respectively at the 0st h , 0rd , 00th , 00th , and 00th day after spraying and at the harvest time . The results indicate that less than 0% of HCH and 00% of DDT were absorbed by the surface of rice leaves for normal dosage . Most of both pesticides moved into the soil in solution after spraying . Compared with DDT , HCH was degraded and run off more easily . HCH residues in the surface soil layer ( 0-0 cm ) were already below 0 . 0 microg kg ( -0 ) at the mature stage , lower than Chinese Environmental Quality Standard for Agricultural Soils : HCH < 0 . 00 mg kg ( -0 ) . However DDT residues in the surface soil layer remained 000 microg kg ( -0 ) , higher than the national standard : DDT < 0 . 00 mg kg ( -0 ) . According to the test f OCP residues in rice seeds , it can be concluded that the OCP sprayed onto the surface of rice leaves can move into rice plants and accumulate in the seeds at the mature stage . HCH residues in rice seeds of the double and four times dosage treatments , and DDT residues in all treatments , exceeded the Chinese National Food Standard ( HCH < 0 . 00 mg kg ( -0 ) , DDT < 0 . 00 mg kg ( -0 ) ) . [ Sen. 0, subscore: 0.00 ]: This paper reports a study of the distribution of organo-chlorine pesticides ( DDT and HCH ) between rice plants and the soil system by spraying before the heading stage at four different dosage levels--control , normal dosage ( 00 kg ha ( -0 ) of 0% HCH and 0 . 0 kg ha ( -0 ) of 00% DDT ) , double dosage and four times dosage . Soil and plant samples were taken respectively at the 0st h , 0rd , 00th , 00th , and 00th day after spraying and at the harvest time . The results indicate that less than 0% of HCH and 00% of DDT were absorbed by the surface of rice leaves for normal dosage . Most of both pesticides moved into the soil in solution after spraying . Compared with DDT , HCH was degraded and run off more easily . HCH residues in the surface soil layer ( 0-0 cm ) were already below 0 . 0 microg kg ( -0 ) at the mature stage , lower than Chinese Environmental Quality Standard for Agricultural Soils : HCH < 0 . 00 mg kg ( -0 ) . However DDT residues in the surface soil layer remained 000 microg kg ( -0 ) , higher than the national standard : DDT < 0 . 00 mg kg ( -0 ) . According to the test f OCP residues in rice seeds , it can be concluded that the OCP sprayed onto the surface of rice leaves can move into rice plants and accumulate in the seeds at the mature stage . HCH residues in rice seeds of the double and four times dosage treatments , and DDT residues in all treatments , exceeded the Chinese National Food Standard ( HCH < 0 . 00 mg kg ( -0 ) , DDT < 0 . 00 mg kg ( -0 ) ) . Score: 0.00 Title: [ Effects of Bacillus thuringiensis transgenic rice and chemical insecticides on arthropod communities in paddy-fields ] 