水溶性硅钾肥对除草剂防效及大豆农艺性状的影响OA

To clarify the effects of the mixed use of water-soluble silicon-potassium fertilizers and herbicides on the weed control efficacy,soybean safety and agronomic traits in soybean fields,and to screen the best application plan.A random block design was adopted.Four chemical treatment combinations were set up at the first compound leaf unfolding stage,before flowering,full flowering stage and podding stage of soybeans,along with artificial treatment groups and blank controls(CK).To explore the effects of the mixed application of water-soluble silicon-potassium fertilizer at different application periods,different application amounts with 35％clomazone·quizalofop-p-ethyl·fomesafen EC on soybeans,and to systematically evaluate its application effect by investigating the pesticide damage situation,weed control efficacy,growth indicators and yield.The results showed that phytotoxicity occurred in the treatment groups(T1,T2,and T4)treated with 35％clomazone·quizalofop-p-ethyl·fomesafen EC 7 and14 days after application.However,there was no significant difference in the degree of phytotoxicity whether water-soluble silicon-potassium fertilizers were mixed or not,and the phytotoxicity symptoms basically recovered 28 days after application.The water-soluble silicon-potassium fertilizer has good miscibility with this herbicide,without adverse reactions such as flocculation and precipitation.The total plant number control efficacy was 91.9％—92.9％15 days after application,and 93.6％-94.4％and 94.0％—94.5％fresh weight control efficacy at 30 days.There was no significant difference in control efficacy compared with the application of the herbicide alone.In terms of growth indicators,T2 performed the best.The plant height(81.01 cm),fresh weight per plant(103.45 g),and dry weight per plant(24.54 g)were significantly higher than those of other treatments.The indicators of T4 were significantly lower than those of T1,T2,and T3.Water-soluble silicon-potassium fertilizer can promote the flowering of soybeans.In terms of yield,each treatment group increased the yield by 2.97％to 10.27％compared with manual weeding,and by 84.45％to 97.54％compared with the blank control group.Among them,T2 had the highest yield(4 249 kg·ha-1),showing a significant increase in yield.Within the test dosage range[66-100 mL·(667 m2)-1],water-soluble silicon-potassium fertilizer can be mixed with 35％clomazone·quizalofop-p-ethyl·fomesafen EC,which is safe for soybeans without affecting the weeding effect.At the same time,it can significantly improve the growth indicators of soybeans,and increase the yield.It is recommended to apply continuously during the first compound leaf unfolding period,before flowering,full flowering period and podding period of soybeans.The recommended dosage is 66 to 100 mL·(667 m2)-1.