Effect of Triazophos Degradation on Chlorophyll Content in Rice (<I>Oryza sativa</I> L.) and their Correlation Study*

Abstract

Field experiments were conducted to study the effect of triazophos degradation on chlorophyll content,and the correlation between triazophos degradation ratio and change ratio of chlorophyll content in leaves of two rice varieties(Nei2you6,Xiushui09),which were treated with triazophos at two concentrations(2 250 mL hm-2 and 4 500 mL hm-2) at previously ripening stage.The results showed that triazophos affected chlorophyll content and its effect increased with the increasing of triazophos concentration.The time effect of triazophos on chlorophyll content was different between Nei2you6(20 d) and Xiushui09(20 d).Triazophos caused significant variation in chlorophyll content between the two varieties with time.The chlorophyll content of the two varieties treated with triazophos did not statistically show significant difference against CK(P0.05) after spraying triazophos.During the period from day 3 to 14 after spraying,the chlorophyll content decreased in Nei2you6,but increased in Xiushui09 compared with the CK(P0.05) respectively.The chlorophyll content in Nei2you6 and Xiushui09 did not change significantly and increased significantly compared with CK(P0.05) at day 21 after triazophos was sprayed.Generally,triazophos degradation ratio was correlated with change ratio of chlorophyll content,but the correlation was significantly different between the two varieties,that is,negative correlation existed for Nei2you6 and positive for Xiushui09.