Reduction And Control Effects Of Sulfur Forms And Related Factors Of Nitrate Accumulation In Chinese Chive

Vegetable Nitrate pollution problem has been widely recognized. The experiment isbased on the basic principles that reduction of nitrate is more than absorption lead to theaccumulation and pollution of nitrate. In order to promote the reduction ofNO3-assimilation as the breakthrough point, using the SA treatment of the foliarapplication of sulfur or salicylic acid, which shows that it can effectively reduce theaccumulation and pollution of nitrate in Chinese chive. On the basis of it, this study useddifferent forms of sulfur, and the treatment of salicylic acid or potassium dihydrogenphosphate to select out the key technology that the accumulation and pollution of nitrate inChinese chive were reduced controlled efficiently by compound form sulfur andcooperation factor. Meanwhile, nitrate content in Chinese chive and activity of key enzyme,nutritional quality content, total nitrogen content, chlorophyll content and so on duringreduction of assimilation process were tested, and Efficient regulation mechanismof complex morphological sulfur and matching factor of reduction and assimilation ofnitrate in plants were explored, so they provide a theoretical basis for further mining thepositive and effective measure reduction and control of pollution of nitrate accumulation invegetables.1. For three forms of inorganic sulfur fertilizer (NaHSO3、Na2SO4、Na2S2O3), themixed use of NaHSO3and Na2S2O3is the most significant to reduce nitrate in Chineseleeks, and The sulfur of composite form (7.5mmol/L NaHSO3+1.25mmol/L Na2S2O3)isthe best. Foliage was sprayed on the18th day the Chinese chive were harvested, thenitrate content in leaves decreased by35.79%than the control on the12th day after thetreatment. The reduction control effect is higher than the separate form sulfur element(NaHSO3、Na2SO4、Na2S2O3) by26.09%、33.04%、14.37%.2. The reducing effect of the sulfur content in leaves of composite form （7.5mmol/L NaHSO3+1.25mmol/L Na2S2O3）with SA or KH2PO4is better than the separateapplication of SA or KH2PO4significantly. Foliage was sprayed on the18thday the Chinesechive were harvested, and after the12thday when the treatment was done, the treatment of7.5mmol/L NaHSO3+1.25mmol/L Na2S2O3+3mmol/L SA、7.5mmol/L NaHSO3+1.25mmol/L Na2S2O3+3‰KH2PO4is lower than the control by31.40%and42.74%, and thereduction effect of the sulfur content in leaves is higher than separate application of 3mmol/L SA、3‰KH2PO4by27.89%and36.00%.3. On the12thday after the treatment of5mmol/L Na2S2O3、5mmol/L NaHSO3+2.5mmol/L Na2S2O3+3mmol/L SA、7.5mmol/L NaHSO3+1.25mmol/L Na2S2O3+3‰KH2PO4, the content of nutrition indicators of soluble protein, free amino acids, solublesugar, and the ratio of free amino acids and soluble protein were increased significantly,and for Vitamin C, the difference is not obvious.4. The combined application of complex state of sulfur and SA or KH2PO4canincrease the biomass of Chinese chive effectively. The treatment of5mmol/L Na2S2O3+3mmol/L SA is higher than the control by15.31%; and after the treatment of5mmol/LNa2S2O3、7.5mmol/L NaHSO3+1.25mmol/L Na2S2O3+2mmol/L SA, the SPAD ofChinese chive leaves increased significantly, which shows it can promote the synthesis ofchlorophyll, improve the efficiency of light, and promote the transformation of nitrateindirectly.5. On the12thday after the treatment of7.5mmol/L NaHSO3+1.25mmol/LNa2S2O3、7.5mmol/L NaHSO3+1.25mmol/L Na2S2O3+3mmol/L SA、7.5mmol/LNaHSO3+1.25mmol/L Na2S2O3+3‰KH2PO4, nitrate content in Chinese chive weredecreased significantly, and meanwhile the activity of NR, GS, GOT, GPT were promotedsignificantly.