Changes in Nitrogen Pools in the Maize–Soil System after Urea or Straw Application to a Typical Intensive Agricultural Soil: A <sup>15</sup>N Tracer Study
Jie Zhang,
Ping He,
Dan Wei,
Liang Jin,
Lijuan Zhang,
Ling Li,
Shicheng Zhao,
Xinpeng Xu,
Wei Zhou,
Shaojun Qiu
Affiliations
Jie Zhang
College of Resources and Environmental Sciences, Hebei Agricultural University, Baoding 071000, China
Ping He
Key Laboratory of Plant Nutrition and Fertilizers, Ministry of Agriculture and Rural Affairs, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China
Dan Wei
Institute of Plant Nutrient and Resources, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China
Liang Jin
Institute of Plant Nutrient and Resources, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China
Lijuan Zhang
College of Resources and Environmental Sciences, Hebei Agricultural University, Baoding 071000, China
Ling Li
China Agricultural Science and Technology Press, Chinese Academy of Agricultural Sciences, Beijing 100081, China
Shicheng Zhao
Key Laboratory of Plant Nutrition and Fertilizers, Ministry of Agriculture and Rural Affairs, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China
Xinpeng Xu
Key Laboratory of Plant Nutrition and Fertilizers, Ministry of Agriculture and Rural Affairs, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China
Wei Zhou
Key Laboratory of Plant Nutrition and Fertilizers, Ministry of Agriculture and Rural Affairs, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China
Shaojun Qiu
Key Laboratory of Plant Nutrition and Fertilizers, Ministry of Agriculture and Rural Affairs, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China
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 15N cross-labeling technique. Soil N pools, maize N and their 15N abundances were determined during maize growth. The urea plus straw treatment significantly (p p p 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.
