Effects of Different Herbicides on Weed Control, Agronomic Characters and Grain Quality of Coix lacryma-jobi L

Abstract #Objectives] The paper was to study the effects of diferent herbicides on weed control, agronomic characters and grain quality of Coix lacryma-jobi L. #Methods] Six commonly used herbicides were selected for the trial, including atrazine SC, butachlor SC, monosulfuron WP, MCPA-starane EC, clopyralid AS and tribenuron-methyl WP. #Results] (i) Atrazine, butachlor and monosulfuron had no chemical injury to C lacryma-jobi L. , while clopyralid caused sight chemical injury. (ii) The fresh weight control effects of atrazine, butachlor and monosulfuron on weeds increased first and then decreased. Herbicides had diferent effects on main stem diameter, tiller number per plant and grain number per plant of C lacryma-jobi L. (iv) Different herbicides had no significant effect on 100-grain weight, but had significant effect on yield. (v) Compared with manual weeding, atrazine, butachlor and clopyralid decreased the protein content of C lacryma-jobi L. , and the use of atrazine, butachlor, monosulfuron, MCPA-starane and fribenuron-methyl decreased the fat content of C. lacryma-jobi L. ; butachlor and MCPA-starane decreased the glycerol trioleate content of C lacryma-jobi L. Compared with no weeding, chemical herbicides had no significant effect on the protein content, while atrazine decreased the fat content, and butachlor and MCPA-starane decreased the glycerol trioleate content of C. lacryma-jobi L. # Conclusions] The use of herbicides significantly increases crop yield compared with no weeding, but has an impact on agronomic characters and grain quality. Through literature review, the published literature repots selated to C. lacryma-jobi L. mainly focused on the aspects of high-yield cultivation, variety selection, plant physiology, medicinal value and clinical prescription application, while no relevant literature reports were found on the control effect of herbicide on weeds in the field and the correlation effect on agronomic characteres and quality of C. lacryma-jobi L. #12 13]. The protein content, fat content and glycerol trioleate content of grain were analyzed and measured by external inspection method. 2.5 Data processing The weed control effect, plant height, stem diameter, number of tillers per plant, number of seeds per plant, 100-gain weight, yield, protein content,