Effect of single application of water-borne polymer coated controlled-release blend fertilizer on nitrogen utilization in rice

XIN Zhi-yuan;WANG Chang-quan;SHEN Ya-zhen;MA Fei;ZHOU Jian-min;DU Chang-wen;College of Resource and Environment, Sichuan Agricultural University;The State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences;

water-borne polymer coated controlled release blend fertilizer;;one-time fertilization;;nitrogen utilization;;soil headspace;;ammo nia volatilization;;nitrous oxide emission

A field experiment was conducted to study the effects of one-time fertilization of water-borne polymer coated controlled release blend fertilizer on rice growth, rice yield, plant nitrogen absorption, soil nitrogen dynamics and nitrogen-containing gas emissions(NH3and N2O). Rice cultivar used was Nanjing 46. Three treatments were no fertilization, conventional fertilization, and one-time fertilization of wa-ter-borne polymer coated controlled release blend fertilizer(controlled release nitrogen accounted for 30%). One-time fertilization treat-ment increased rice yield to 6 506.9 kg·hm-2from 6 201.9 kg·hm-2in the conventional fertilization, but slightly reduced NH3 and N2O average concentrations in soil headspace to 18.63 μmol·mol-1and 7.74 μmol·mol-1from 19.14 μmol·mol-1and 8.40 μmol·mol-1in the conventional fertilization, respectively. The residual nitrate nitrogen and ammonium nitrogen in soil showed an increase tendency in the one-time fertilization. The agronomic efficiency of nitrogen was 7.81 kg grain·kg-1N for the conventional fertilization, while it was 9.09 kg grain·kg-1N for the one-time fertilization. Therefore, the one-time fertilization showed more stable nitrogen supply, and also improved nitrogen utilization efficiency.