Effects of N fertilization and maize straw on the dynamics of soil organic N and amino acid N derived from fertilizer N as indicated by 15N labeling
| Autor: | Yi Shi, Zhenzhen Teng, Huaihai Chen, Xin Chen, Caiyan Lu, Xudong Zhang, Jian Ma, Lei Yuan, Hongbo He |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
0106 biological sciences
chemistry.chemical_classification Crop residue Chemistry fungi Amendment food and beverages Soil Science chemistry.chemical_element 04 agricultural and veterinary sciences engineering.material Straw 01 natural sciences Nitrogen Amino acid Human fertilization Agronomy 040103 agronomy & agriculture engineering 0401 agriculture forestry and fisheries Fertilizer Mollisol 010606 plant biology & botany |
| Zdroj: | Geoderma. 321:118-126 |
| ISSN: | 0016-7061 |
| DOI: | 10.1016/j.geoderma.2018.02.014 |
| Popis: | The accumulation and availability of soil organic nitrogen (N), especially amino acid N, is highly important for N retention in the soil and N supply for crop growth. However, it remains obscure how the conversion of fertilizer N to both soil organic N and amino acid N is affected by management practices such as fertilization and residue amendment. In present study, we conducted an outdoor 15N labeling pot experiment in Mollisols of Northeast China, where plants were consecutively cropped after each of three cultivations (spring wheat-buckwheat-spring wheat). We aimed to evaluate the effects of maize straw applications on the dynamics of organic N and amino acid N derived from fertilizer N. Six treatments were set: no N fertilization (CK), application of only maize straw (M), low N levels (N1), N1 plus maize straw (N1 + M), high N levels (N2), and N2 plus maize straw (N2 + M). The results showed that organic N and amino acid N dominated the available N derived from fertilizer N, but their contents decreased significantly as crop cultivation continued. Compared with N2, N2 + M, which involved the application of maize straw, significantly increased the content of organic N derived from fertilizer N by an average of 20.1% during the first crop cultivation. Compared with N1 and N2, N1 + M and N2 + M promoted the content of fertilizer-derived amino acid N by an average of 12.5% across five sampling dates. During the first crop cultivation, straw amendment also significantly increased both plant uptake and soil residues of fertilizer N in N1 + M and N2 + M. Our results demonstrated that substrate amendments such as crop residues may constitute a practical agricultural management approach for promoting the transformation of fertilizer N to soil organic N, thereby increasing both fertilizer N use efficiency and retention in our study crop-soil systems. |
| Databáze: | OpenAIRE |
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