Comparison of Fate of Nitrogen Applied to 4 Different Kinds of Soils with Particular Reference to Denitrification

スポンサーリンク

概要

• 論文の詳細を見る

• We determined the in situ denitrification rate of four different kinds of soils during the growing season of maize by the combination of an intact core method and an acetylene inhibition technique. The soils used were Low-humic Andosols, Cumulic Andosols, Gray Lowland Soils, and Yellow Soils to which 20 Mg ha^-1 of manure was applied every year. In addition, we simultaneously investigated the N balance sheet of the same maize fields using ^15N-labelled fertilizer. The average denitrification rate during the growing season of maize (from May 21 to August 24, depth: 0-20 cm) was 2.0 g N ha^-1 d^-1 for Low-humic Andosols, 16.1 g N ha^-1 d^-1 for Cumulic Andosols, 20.3 g N ha^-1 d^-1 for Gray Lowland Soils, and 192.4 g N ha^-1 d^-1 for Yellow Soils, respectively. The denitrification rates in the subsurface layer (10-20 cm) were higher than those in the surface layer (0-10 cm) irrespective of the soils. Logarithm to the average denitrification rate throughout the growing season was highly correlated with the solid-phase ratio of the soils. Total amount of denitrified N from Yellow Soils during the growing season of maize was estimated to be 12% of applied N, whereas the amount from the other soils was lower than 2%. A considerable amount of nitrate remained in the subsurface layer (30-45 cm) of the Low-humic Andosols and Cumulic Andosols at harvest time. The major part of the remaining ^15N-labelled fertilizer in the Gray Lowland Soils and Yellow Soils was distributed in the surface layer, which mainly occurred in an immobilized form. At harvest time, the ratio of ^15N-labelled fertilizer which was unaccounted for was 19.2 ± 11.1% of the total for Low-humic Andosols, 44.4 ± 10.6% for Cumulic Andosols, 47.4 ± 9.8% for Gray Lowland Soils, 68.8 ± 12.0% for Yellow Soils, respectively. The discrepancy between the amount of denitrification and unaccounted loss indicates that leaching of nitrate was mainly responsible for the loss of N fertilizer. However, in the Yellow Soils, denitrification was considered to be a significant cause of N loss as well as leaching of nitrate.

• 社団法人日本土壌肥料学会の論文

著者

• Li Xinhui

  Faculty of Horticulture Chiba University

• Li X

  Univ. Saskatchewan Sk Can

• Li Xinhui

  National Agriculture Research Center:(present Address) Faculty Of Horticulture Chiba University

• Nishio T

  National Agricultural Res. Center Tsukuba Jpn

• Nishio Takashi

  National Agriculture Research Center

• Komada Michio

  National Institute for Agro-Environmental Sciences

• Komada Michio

  National Inst. For Agro‐environmental Sci. Ibaraki Jpn

• Li Xinhui

  National Agriculture Research Center

• KOMADA Michio

  National Agricultural Research Center, Japan

関連論文

• 24-17 N_2O production and consumption in relation to enzyme and microbial activities in Andosol profile
• 44 Gaseous losses of applied nitrogen from a maize field determined by ^N analysis of N_2 and N_2O
• Estimation of Zinc and Copper Balance in Japanese Farmland Soil Associated with the Application of Chemical Fertilizers and Livestock Excreta (Fertilizers and Soil Amendments)
• Comparison of Fate of Nitrogen Applied to 4 Different Kinds of Soils with Particular Reference to Denitrification
• Recent trends in nitrogen and phosphate use and balance on Japanese farmland(Environment)
• Comparison of bacterial and fungal biomass determined by phospholipid fatty acid and direct microscopical analysis in 4 types of upland soils.
• Behavior of Zinc in a Constructed Wetland System Receiving Domestic Wastewater
• Comparison of bacterial and fungal biomass determined by phospholipid fatty acid and direct microscopical analysis in 4 types of upland soils

スポンサーリンク