Effect Of Different Fertilization Management On Soil Carbon And Nitrogen For Wheat-maize Rotation

A field experiment was conducted in Yuzhou county of Henan province(Middle Henan) using wheat varietie Yumai49–198 ang maize varietie Xiuqing 74-9 to study the effects of current practice(the farmers’ practice in the region but conducted in experimental plots,T1), improved practice(which modified current practice to off set the major limitations to crop growth,T2), high yielding(which maximized yields without regard to costs,T3),(4) integrated soil–crop system management(which used advanced crop and nutrient management,T4) on crop impact of changes in soil carbon and nitrogen. It discusses the changes in soil quality under continuous cultivation, as well as in four management variation of soil carbon and nitrogen.Main results are as follows:1.The different fertilization management has a significant effect on total soil nitrogen. When compared to the first quarter of the wheat harvest, The T1 treatment soil 0-30 cm, 30-60 cm soil nitrogen content decreased, while the T2、T3 and T4 treatment have increased. The T4 treatment 30-60 cm highest cumulative total nitrogen in the soil, improving soil total nitrogen effect is obvious.2. The different fertilization managemen has a significant effect on total soil nitrogen. The T1 treatment can improve the acid hydrolysable N and the components of acid hydrolysable N,improve the Non hydrolysable N and the the components of Non hydrolysable N. The T2 treatment can improve the acid hydrolysable N and the components of acid hydrolysable N, ruduce the Non hydrolysable N and the the components of Non hydrolysable N. The T3 and T2 treatment process has the opposite effect. The T4 treatment can improve the acid hydrolysable N and the components of acid hydrolysable N. Different fertilization management treatment are 60-90 cm soil the acid hydrolysable N and the components of acid hydrolysable N, improve the Non hydrolysable N and the components of Non hydrolysable N. Among the T1 treatment soil cid hydrolysable N decreased the most significant.3. The different fertilization managemen has a significant impact in 0-30cm、30-60 cm soil organic nitrogen forms content. After six seasons of fertilization, in 0-30 cm, 30-60 cm in soil and the T1 treatmen of the ammonium N(AAN) content decreased in forms, the T2、T4 treatment can increase the ammonium N(AAN), the T3 treatment can ammonium N(AAN) remains unchanged. Compared to the first quarter of the harvest, in other treatment in 0-30 cm, 30-60 cm soil Amino acid N and amino sugar N(ASN) content decreased, while the T4 treatment under 0-30 cm Amino acid N content smallest decline, 30- 60 cm remain stable. The T4 treatment most significant reduction 0-30 cm, 30-60 cm soil amino sugar N content.4. The different fertilization managemen has a significant impact soil total carbon content. After six quarters of fertilization, the T1 treatment under 0-30 cm, 30-60 cm, 69-90 cm of soil total carbon depletion serious. The T2 treatment can effectively reduce soil total carbon content. The T4 treatment can both increase the total carbon content.In other processing 60-90 cm the total carbon is declining, the T4 treatment rate to maintain the contents of the total carbon stable.5. After six quarters of fertilization, in 0-30 cm, 30-60 cm soil, each treatment soil ROC have increased, increased 0.9%、12%、0.6% and 24.4%. T4 treatment can be more conducive to increase soil ROC content and ROC/TOC. Each treatment can reduce the soil ROC content, but the T4 treatment can reduce the content of the soil ROC. The T3 treatment in 0-30 cm, a substantial increase in 30-60 cm soil total carbon content is mainly due to a significant increase in SOC content of the soil6. According to the Path relationship analysis,we can available soil carbon and nitrogen forms on the combined effect of wheat yield rankings: TN>ROC>HOC>ASN>AAN>CAN. The combined effect on corn yield rankings: ROC>AAN> NHN >ASN>ACN>HOC>TN. The Soil C / N of the combined effect of the size of the crop yield followed: C TOC/N ASN> C TOC/N NHN> C TOC/N AAN> C TOC/N TN.7. Compared with the T1 treatment, the T4 treatment was significantly higher crop yields and significantly increased soil of TOC、TN, ACN, ROC, slowing soil reduce the soil of AAN, reducing the soil ASN, reduce soil oxidation stability coefficient. Considering the crop yield and soil fertility, the T4 treatment for the rapid increase agricultural productivity of the soil is important.