• ISSN 1008-505X
  • CN 11-3996/S
LIU Min, SONG Fu-peng, LU Yan-yan. Effects of sulfur-and polymer-coated controlled releaseurea fertilizers on spatial-temporal variations of soil NO-3-N and nitrogen balance and nitrogen use efficiency[J]. Journal of Plant Nutrition and Fertilizers, 2015, 21(2): 541-548. DOI: 10.11674/zwyf.2015.0231
Citation: LIU Min, SONG Fu-peng, LU Yan-yan. Effects of sulfur-and polymer-coated controlled releaseurea fertilizers on spatial-temporal variations of soil NO-3-N and nitrogen balance and nitrogen use efficiency[J]. Journal of Plant Nutrition and Fertilizers, 2015, 21(2): 541-548. DOI: 10.11674/zwyf.2015.0231

Effects of sulfur-and polymer-coated controlled releaseurea fertilizers on spatial-temporal variations of soil NO-3-N and nitrogen balance and nitrogen use efficiency

  • 【Objectives】 Controlled release urea has been proven to have positive significance to increase nitrogen use efficiency, reduce nitrogen loss and increase production. Different controlled release urea coated with different materials has different N release rate and N supply intensity. A field experiment was conducted in a maize farmland in Huang-Huai-Hai area to study the effects of sulfur-and polymer-coated controlled release urea on regulation N supply intensity and reducing nitrogen loss. This study is aimed to provide guidance on sulfur-and polymer-coated controlled release urea application in Huang-Huai-Hai maize zone under the condition of high temperature and rainy.【Methods】 The field experiment was conducted to study the effects of sulfur-and polymer-coated controlled release urea on the 0-100 cm spatial-temporal variations of soilNO-3-N, nitrogen balance and nitrogen fertilizer use efficiency.【Results】 Compared with common urea of the same N application rate, the sulfur - and polymer-coated controlled release urea has the characteristics of controlled N-supply in the beginning and sufficient N-supply in later days. The sulfur- and polymer-coated controlled release urea reduces soil NO-3-N content of 0-100 cm soil layer by 11.7%-56.7% and 28.8%-68.2% respectively during maize seedling stage, increases soil NO-3-N content of 0-40 cm depth at maize filling and harvesting stages by 16.3%-46.7%, 0.5%-60.7%, respectively. The sulfur- and polymer-coated controlled release urea reduces the soil residual nitrogen content by 12.0%-18.4%, nitrogen apparent loss by 13.2%-66.4% and the nitrogen surplus by 15.6%-30.9% in the whole maize growth stage, respectively. The maize yield and the utilization rate of nitrogen were increased by 14.6%-37.5% and 12.3-20.8 percentage points, respectively. Compared with sulfur-coated controlled release urea of the same N application rate 210 kg/ha or 300 kg/ha, polymer-coated controlled release urea reduces the soil NO-3-N content of 0-60 cm depth by 26.4%-39.1% during maize seedling period, brings up the soil NO-3-N content of 0-40 cm at maize filling stage by 10%-21.8% and that of 0-20 cm at maize harvesting stage by 9.6%-16.4%, respectively. Polymer-coated controlled release urea reduces the soil residual nitrogen content by 2.3%-6.0%, nitrogen apparent loss by 44.6%-61.3% and nitrogen surplus by 17.0%-17.7% than those of sulfur-coated controlled release urea with the same N application rate, respectively. Polymer-coated controlled release urea improves the maize yield and the utilization rate of nitrogen by 6.8%-8.3% and 7.1-8.4 percentage points more than those of sulfur-coated controlled release urea with the same N application rate, respectively. Over all, polymer-coated controlled release urea is better than sulfur-coated controlled release urea in reducing the soil residual nitrogen content, and maintaining the soil nitrogen balance and improving nitrogen fertilizer use efficiency. The N application rate 300 kg/ha of the polymer-coated controlled release urea or the sulfur-coated controlled release urea increases the soil NO-3-N content of 0-100 cm depth during maize growing stagesby 1.2%-90.9%, 2.0%-56.7% respectively and increases the soil residual nitrogen content, nitrogen apparent loss and nitrogen surplus by 42.1%-47.6%, 66.2%-137.9% and 52.5%-53.8% respectively. The 300 kg/ha application rate also improves the maize yield and the utilization rate of nitrogen by 20.8% and 22.5%, 6.5 and 5.2 percentage points more than that of the N application rate of 210kg/ha respectively. The effects of the N application rate 300 kg/ha of the polymer- or the sulfur-coated controlled release urea are better than those of the N application rate 210 kg/ha.【Conclusions】 Polymer-coated controlled release urea in reducing soil profile nitrate nitrogen residual, maintaining soil nitrogen balance and improving the utilization rate of nitrogen in summer maize farmland is better than sulfur-coated controlled release urea and common urea. In the context of sufficient N supply, reduced nitrogen loss, improved maize yield and nitrogen utilization efficiency, the application of the polymer-coated controlled release urea or combining with sulfur-coated controlled release urea at N application rate of 300 kg/ha is the best recommended nitrogen fertilization management practice for Huang-Huai-Hai summer maize zone which is under the condition of high temperature and rainy climate.
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