The Influence Of Inherbicide Phytotoxicity On The Growth And Development And Yield Of Soybean

There are lots of crop resulted different herbicide phytotoxicity following the applied quantity and range of inherbicide increasing year after year in different reason.So,it is an emergent problem to grade the herbicide phytotoxicity and study on the relation between the different degree damage and the loss of yield.In this investigation ,the effect of growth inhibited type phytotoxicity and thixotropic type phytotoxicity on the growth and yield of soybean was studied by field testing method.The testing data was analyzed by Exell and SAS software .The following results were obtained:1 .The influence of growth inhibited type phytotoxicity and thixotropic type phytotoxicity on the growth factors of soybean was singal at early stage.The growth inhibited type phytotoxicity and thixotropic type phytotoxicity were graded 5 class and established correspoding degree standard according to the field observation and testing data analysis.2.The effect of herbicide damage on the growth and development of soybean was evident. The phytotoxicity will less the leaf area and fresh weight and dry weight of soybean than control at early stage.The severe damage will effect in whole period of duration. The growth inhibated type phytotoxicity will lower the height of soybean,while the thixotropic type phytotoxicity effect light3.The habicide damage will bring about significant difference in yield of soybean.Different type and different degree damage raduce in yield in different grade.The different class growth inhibited type phytotoxicity respectively raduce in yield of per plant 4.9533.37% and plot yield 4.81-37il2%;The different class thixotropic type phytotoxicity respectively raduce yield of per plant 6.15-23.05% and plot yield 3.92-28.59%.4.The testing data was analyzed by Exell and SAS software and the dependent regression equation was established in stepwise regression ways between the single plant yield and growth factors of soybean in damage at early or medial stage.The fitted multiple regresstion equations attain level of significance.