Effects of controlled-release nitrogen fertilizer on soil nitrous oxide emissions from broccoli (<i>Brassica oleracea</i> var. italica) autumn-cultivation field

DOI JASI Web Site 2 Citations

Bibliographic Information

Other Title
  • ブロッコリー秋作における被覆肥料の施用が土壌からの一酸化二窒素発生に与える影響
  • ブロッコリー アキサク ニ オケル ヒフク ヒリョウ ノ シヨウ ガ ドジョウ カラ ノ イッサンカ ニ チッソ ハッセイ ニ アタエル エイキョウ

Search this article

Abstract

<p>Nitrous oxide (N2O) is one of the important greenhouse gases emitted from agricultural field. We investigated nitrous oxide (N2O) emissions following the application of coated urea (CU) and calcium nitrate in autumn broccoli cultivation field. The experiment was conducted in Ehime University Farm from September to November 2016 and comprised four treatments: non-fertilized (C), urea (U), CU, and coated calcium nitrate (CN) applications. In CU and CN treatments, we applied only 80％ of the nitrogen (N) fertilizer used in treatment C; of this, 40％ was replaced with coated fertilizer. We measured the N2O flux and N2O emission factor (EF) induced by applied N as well as soil environmental factors including soil temperature at 5-cm-depth, soil pH, and soil ammonium and nitrate concentrations. We also measured yield, concentration of N leaching from the top 20-cm soil layer, N uptake by plant, and N use efficiency. EFs of the CU (0.62％) and CN (0.23％) treatments were higher than that of the U (0.06％) treatment. Application of CU or CN instead of U did not reduce N2O emissions from the autumn cultivation of broccoli. In the early stages of the experiment, N elution from the coated fertilizer following nitrification and denitrification might have been enhanced due to higher temperatures and precipitation. In addition, N2O emission from the applied supplemental N was low because of lower temperature and precipitation conditions following the supplemental fertilization in U. Lower yield and higher levels of leached N in CN treatment may have been due to the loss of N with higher precipitation after basal fertilization. Our study demonstrates that application of coated U could increase N2O emissions relative to the application of U under higher temperature and precipitation conditions following the application. Furthermore, application of CN may decrease the yield and increase leaching of N.</p>

Journal

Citations (2)*help

See more

Keywords

Details 詳細情報について

Report a problem

Back to top