Contribution Of Zinc Fractions To DTPA-Zn And Zinc Supply Capacity

Zinc is one of the necessary trace elements of human beings, and zinc deficiency in human beings can lead to various diseases, and even affect people’s life and health. But the wheat as the main food crop, plays an important role in human zinc. Wheat grain zinc content mainly with the soil available zinc content related, and Northern China most calcareous soil, belonging to the potentially Zn deficient soil. Therefore, how to improve the soil available zinc content becomes an effective way to solve the main problem of Zn deficiency in calcareous soil. In the soil, the relationship between the distribution of zinc and zinc fertilizer is very important. The bioavailability of different forms of zinc in soil is different, which is in order to exchange state, loose knot organic state, carbonate bound state, manganese oxide bound state, and tight junction organic state. When the content of DTPA-Zn was the same in the soil, the different forms of zinc were different, which would lead to the different ability of the soil to supply zinc. Adding straw to the soil can not only increase the content of organic matter in the soil, but also increase the activity of zinc in the soil. By measuring the amount of zinc in soil and its contribution to DTPA-Zn, this study explores the relationship between the chemical components of the soil and the effect of zinc on the ability of the soil to supply zinc. The main conclusions of this study are as follows:(1) Through the determination of DTPA-Zn content of different fertilization soil and different forms of zinc content, the results show that the zinc deficiency in soil, only adding straw could not significantly increase DTPA-Zn content in soil, but can change the distribution of zinc content in soil, promote the transformation between different forms of zinc in the soil, increase the exchangeable zinc and carbonate with the amount of DTPA-Zn zinc with high activity zinc to effectively promote the contribution of zinc content; adding zinc fertilizer can significantly improve the contribution of DTPA-Zn content in soil and different forms of zinc, which is the largest contribution to growth of exchangeable and carbonate bound zinc; while applying zinc fertilizer and straw significantly increased the content of DTPA-Zn in the soil and the forms of zinc content, promote the transformation between different forms of zinc, which is the highest contribution of exchangeable zinc, but added straw appears to inhibit the effect of zinc fertilizer The phenomenon, which may be due to the promotion of zinc fertilizer(2)zinc activation, accelerate the mineralization rate of zinc fertilizer, so lead to the DTPA-Zn content in the soil and the form of zinc content are lower than the zinc fertilizer application alone.(3) By calculating the contribution of different forms of zinc to DTPA-Zn content in the soil, the ability of the soil to supply zinc was studied. The results show that single application of straw and blank processing amount of the greatest contribution to soil DTPA Zn are tightly combined organic and exchangeable zinc; single application of zinc fertilizer and zinc and straw application combined with results consistent, the amount of DTPA Zn contribution maximum for exchangeable and carbonate bound zinc. Show that regardless of the addition of exogenous zinc fertilizer or straw can increase Zn DTPA Zn amount of contribution, and improve the reality of the soil Zn supply capacity, especially after adding the straw, can promote the transformation of soil zinc to effective state, increase in soil exchangeable, loosely combined organic state higher availability of zinc content.In conclusion, Ex-Zn had the maximum contribution of DTPA-Zn in the soil, and Ex-Zn had the highest bioavailability. When the Zn content in soil is lower, the lower bioavailability of zinc form would make much higher contribution amount of DTPA-Zn in soil. When adding straw does not significantly increase soil DTPA-Zn content, but will promote the transformation between forms of zinc in soil and improve the contributions amounts of DTPA-Zn from the higher availability of zinc forms. Adding zinc fertilizer is an effective measure to increase the content of DTPA-Zn and the zinc content in soil, and it can promote the contribution of available Zn in soil to DTPA-Zn, and its effect is better than that of single straw.