Abstract:

To screen effective and safe herbicides suitable for using in broad bean field, widely cultivated variety ‘Chenghu No.15’ in Sichuan was used as experiment material and 7 kinds of herbicides including 2 kinds of pre-emergence herbicides and 5 kinds of post-emergence herbicides were selected, and artificial weeding and the water spray were adopted as the 2 controls. Field experiments were conducted to investigate weed species, the effects of herbicides on weeds, root nodule growth, agronomic characters and yield of broad bean. The results showed that: (1) there were 42 species in 13 families of weeds in broad bean field, the main families were Compositae, Gramineae, Amaranthaceae, Polygonaceae and Cruciferae; (2) 33% pendimethalin, 960 g/L spropisochlor and 15% quizalofop-p-ethyl+ 48% bentazone could effectively control weeds, the level of control effect was three; (3) using herbicide and artificial weeding could affect the growth of broad bean nodules, the fresh weight and dry weight of nodules could be promoted by using , 15% precipitachlor and 15% quizalofop-p-ethyl+ 48% bentazone; (4) 33% pendimethalin significantly increased the grain number of per plant, the effective branch, pod number and grain number of per plant were significantly increased by 960 g/L spropisochlor and 15% quizalofop-p-ethyl+ 48% bentazone; the use of 15% precipitachlor could significantly improve the plant height of broad bean; the three treatments of 33% pendimethalin, 5% quizalofop-p-ethyl and 15% quizalofop-p-ethyl+ 48% bentazone showed significant production increase effect. Considering comprehensively the herbicide control effect, nodule growth, agronomic characters and yield, under the experimental conditions aiming at controlling weeds in autumn broad bean field, the application of pre-emergence herbicide 33% pendimethalin and post-emergence herbicide 15% quizalofop-p-ethyl+ 48% fenvalerate are recommended.

Key words: broad bean, herbicide, weeds, nodule, yield