Effects of Acetochlor on Wheat Growth Characteristics and Soil Residue in Dryland

Abstract

In this experiment, Jimai 22 was used as test material to investigate the impacts of acetochlor on the growth characteri*stics of dryland wheat and its residue in wheat grain and soil under field conditions. The results showed that acetochlor at a dosage of 750 g hm−2 could effectively control weeds in wheat fields and benefit the growth of wheat in dryland. The plant height, ear length, number of tillers, aboveground and underground dry weight were heavier compared to the control after the application of acetochlor. From the jointing period to the filling period, the residual amount of acetochlor in the 0–20 cm and 20–40 cm soil layers was gradually reduced in the overall change, and the residual amount of acetochlor in the 0–20 cm soil layer in each growth period was more than the residual that of in the 20–40 cm soil layer. At the time of harvest, the residual amount of acetochlor in wheat grains was lower than the maximum allowable residue limit (MRL) value of acetochlor on wheat recommended by the United States. In addition, the residue of acetochlor in the soil of wheat field was also very small, all of which were lower than 0.02 mg kg−1. It can be seen that the application of acetochlor is safe for wheat field soil and humans if the wheat is applied once after sowing, at the dosage is 750 g hm−2.