The Effect Of ZnSO₄·7H₂O On Growth, Yield And Quality Of Soybean

In 2007,the study was carried in Heilongjiang August First Land Reclamation University Soybean experiment station. The soil type is meadow.The mode of experiment is pots.Through investigating the effect of different dose of ZnSO4.7H2O (A1:0g/kg, A2:1g/kg, A3:2g/kg, A4:4g/kg, A5:8g/kg, A6:16g/kg) on morphology formation,photosynthetic physiology, absorb of root, mechanism of nitrogen assimilation, hardiness mechanism,yield and quality of soybean,we have probed into the scientific evidence for the Znic nutrition adjusting of soybean.The results as follows:The different dose of Znic mixed with seeds can improved plant height,the stem diameter,the effect of A3,A4 is best.Accumulation of dry matter of all trentment was improved,A3,A4 and A5 is better,The length of major root and the volume of all trentment were improved,A2,A4 and A5 is better. Nodule of all trentment was improved,A4,A5 is better.Znic mixed with seeds improved the area of soybean leaf, the content of Chlorophyll a, b, a+b,Carotenoids and photosynthetic parameters of soybean,effect of A2,A5 is most obvious. That of A1～A6 has no significant difference in R5,but averge number of A5 is beetter.Proper dose of Znic improved the content of starch and soluble sugar, provide plenty of nutrition for the seeds.Znic mixed with seeds improved the bleeding intensity of the soybean plant and root vigor in every growth stage,the effect of A3 and A5 is better. That of most treatments varied with dose in proper limit,while dose of Znic increased,the bleeding intensity and root vigor of soybean plant increased.Content of NO3-—N, NH4+—N and soluble protein was improved with Znic,NO3-—N of A3,A4 and A5 is higher,NH4+—N and soluble protein of A3 and A4 is higher.In proper limit,SOD, POD and CAT activity were improved with Znic in V4,R1 and R3.In R5 and R7, SOD, POD and CAT activity of most treatments were decreased.Content of MDA were decreased by Znic. Pro content of most treatments were decreased by Znic.Among these treatments, effect of the moderate dose of Znic is better.The proper dose of Znic improved the yield, the yield component and quality of soybean.Yield 0f A3 and A4 arrived 5% significance level with CK . Protein of most treatments arrived 5% significance level with CK , the oil didn't arrived 5% significance level with CK.In general, proper dose of Znic can improve grond growth of soybean,absorb of soybean root,photosynthetic physiology,mechanism of nitrogen assimilation and protection ferment activity of soybean,decrease content of the MDA,Pro and O- in soybean, so the yield and quality of soybean.