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Changes in Nitrogen Pools in the Maize–Soil System after Urea or Straw Application to a Typical Intensive Agricultural Soil: A$ ^{15}$N Tracer Study
| Content Provider | MDPI |
|---|---|
| Author | Zhang, Jie He, Ping Wei, Dan Jin, Liang Zhang, Lijuan Li, Ling Zhao, Shicheng Xu, Xinpeng Zhou, Wei Qiu, Shaojun |
| Copyright Year | 2021 |
| Description | A maize pot experiment was conducted to compare the difference of N distribution between bulk and rhizospheric soil after chemical fertilizer with or without soil straw amendment at an equivalent N rate using a$ ^{15}$N cross-labeling technique. Soil N pools, maize N and their$ ^{15}$N abundances were determined during maize growth. The urea plus straw treatment significantly (p < 0.05) increased the recovery of urea N in soil and 26.0% of straw N was assimilated by maize. Compared with urea treatment in bulk soil, urea plus straw treatment significantly (p < 0.05) increased the concentration and percentage of applied N as dissolved organic N (DON) and microbial biomass N (MBN) from milk stage to maturity, increased those as particulate organic N (PON) and mineral associated total N (MTN) throughout maize growth and decreased those as inorganic N (Inorg-N) from the eighth leaf to the silking stage. Compared with bulk soil, rhizospheric soil significantly (p < 0.05) decreased the concentration and percentage of applied N as PON and increased those as Inorg-N and MTN in both applied N treatments from the silking stage, and significantly (p < 0.05) decreased the concentration and percentage of applied N as microbial biomass N (MBN) in the urea plus straw treatment. Overall, straw N was an important N source and combined application of chemical fertilizer with straw increased soil fertility, with the rhizosphere regulating the transformation and supply of different N sources in the soil–crop system. |
| Starting Page | 1134 |
| e-ISSN | 20734395 |
| DOI | 10.3390/agronomy11061134 |
| Journal | Agronomy |
| Issue Number | 6 |
| Volume Number | 11 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2021-06-02 |
| Access Restriction | Open |
| Subject Keyword | Agronomy Agricultural Engineering Bulk Soil Rhizosphere Soil Soil N Pools Maize N Uptake Pot Experiment |
| Content Type | Text |
| Resource Type | Article |
