Scientia Agricultura Sinica

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Humic Acid-urea Complex Combined with Urea on the Characteristics of Ammonia Volatilization of Different Fertilized Soils

JING JianYuan, YUAN Liang, ZHANG ShuiQin, LI YanTing, ZHAO BingQiang   

  1. Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences/Key Laboratory of Plant Nutrition and Fertilizer, Ministry of Agriculture, Beijing 100081
  • Online:2021-09-09 Published:2021-09-09

Abstract: 【Objective Application of humic acid enhanced urea (HAU) can effectively reduce ammonia volatilization. The humic acid in HAU, named UHA, plays a great role in this process. However, due to the reaction between humic acid and urea, the effect of UHA on soil ammonia volatilization may be different from that of conventional humic acid (HA). Relevant research will help to further reveal the mechanism of HAU reducing ammonia volatilization from soil. MethodIn this study, UHA was extracted by absolute ethanol from HAU. The effects of HA or UHA combined with urea on ammonia volatilization of long-term unfertilized soil or fertilized soil were studied. The dosage of HA or UHA was 0.5% and 5% of the amount of urea, code named 0.5HA+U, 5HA+U, 0.5UHA+U, and 5UHA+U, respectively. Treatment with urea (U) and without humic acid and urea (CK) were conducted at the same time. Soil ammonia fluxes and volatilization, soil urea-N, nitrate, and ammonium content, and soil urease activity were measured simultaneously.Result(1) The ammonia volatilization for long-term fertilized soil was higher than that for long-term unfertilized soil, which might be related to low soil pH and prolonged urea residue due to long-term fertilization. (2) Both HA and UHA combined with urea could effectively reduce soil ammonia volatilization, compared with U treatment, but the extent of the reduction depended on whether the soil was fertilized for a long time and the amounts of HA or UHA: urea combined with HA could significantly reduce soil ammonia volatilization for long-term unfertilized soil (P<0.05), and the ammonia volatilization of 0.5HA+U and 5HA+U was 4.39% and 22.88% lower than U treatment, respectively. While the application of HA did not significantly affect ammonia volatilization for long-term fertilized soil. 0.5UHA+U could significantly reduce soil ammonia volatilization (P<0.05) for long-term unfertilized and fertilized soil by 26.46% and 12.91%, respectively. (3) Combined application of HA could effectively inhibit urease activity, and UHA could promote the nitrification process, thereby reduced soil ammonia volatilization. ConclusionIn summary, compared with HA, UHA showed better performance on inhibiting ammonia volatilization, and the effect was independent of whether the soil was fertilized for a long time.


Key words: humic acid enhanced urea, humic acid, humic acid-urea complex, ammonia volatilization, fertilized soil

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