Balance of Nitrogen and Phosphorus in a Paddy Field of Central Korea

スポンサーリンク

概要

• 論文の詳細を見る

• The present study was carried out during a period of 1 y (from May 1, 1997 to April 30, 1998) in a rice cultivation area not affected by livestock farming, farmstead, and industrial complexes to investigate the balance of nutrients in rainfall, irrigation water, runoff water, and infiltration water. The soil of the experimental field belonged to the Jisan series (SiL; fine loamy, mixed mesic family of Fluventic Haplaquepts) covering on area of 5,000 m^2 (100m×50m). In the investigated area, the amount of rainfall was 1,095mm during the cropping season and 415mm during the non-cropping season (off-season). The annual rainfall was 1,510mm. The total amount of runoff water was 1,043mm during the cropping season and 281mm during the off-season and the added total amount of runoff water during the two seasons was 1,324mm. The input amounts of nitrogen and phosphorus were as follows: 217.6kg ha^<-1> for nitrogen and 27.2kg ha^<-1> for phosphorus from chemical fertilizer, 39.5 and 0.7kg ha^<-1>y^<-1> from rainfall, 29.7 and 0.5kg ha^<-1> from irrigation water, 1.0 and 0.2kg ha^<-1> from irrigation sediments, and 34.0 and 12.3kg ha^<-1> from rice straw, respectively. The amount of biological nitrogen fixation was 94.8kg ha^<-1>y^<-1>. The residual amounts of nitrogen and phosphorus in soil were 85.0 and 15.6kg ha^<-1>y^<-1>, respectively. The output amounts of nitrogen and phosphorus from different channels were as follows: 157.9kg ha^<-1>y^<-1> for nitrogen and 4.5kg ha^<-1>y^<-1> for phosphorus from runoff water, 3.2 and 0.9 kg ha^<-1>y^<-1> from runoff sediments, 20.3 and 0.2kg ha^<-1> from infiltration water, and 111.6 and 19.2kg ha^<-1> from rice plant absorption. The nitrogen losses from paddy fields were 24.0kg ha^<-1>y^<-1> by denitrification and 44.6kg ha^<-1> by ammonia volatilization. When the loss ratio was calculated based on the amount of applied chemical fertilizer, about 68.6% of nitrogen was lost by rainfall-runoff while 16.7% of phosphorus was lost. The loss ratio of nutrients by infiltration was as follows: nitrogen, 9.4% out of the amount applied; and phosphorus, 0.6%. Also, about 11% of nitrogen was lost by denitrification and about 20.5% by ammonia volatilization.

• 社団法人日本土壌肥料学会の論文

著者

• Cho J‐y

  School Of Materials Science And Engineering Seoul National University

• Cho J‐y

  Department Of Agricultural Chemistry

• Cho Jae-young

  Steel Research Center National Institute For Materials Science

• Cho Jae-Young

  Department of Agricultural Chemistry

• Han Kang-Wan

  Department of Agricultural Chemistry

• Choi Jin-Kyu

  Department of Agricultural Engineering, Chonbuk National University

• Cho Jae-young

  School Of Materials Science And Engineering Seoul National University

• Choi Jin-kyu

  Department Of Precision Machinery Systems Tokyo Institute Of Technology

関連論文

• Evaluation of Dislocation Density from the Flow Curves of Hot Deformed Austenite
• FEM Modeling of Flow Curves for Ferrite/Pearlite Two-Phase Steels
• Effect of Shear Deformation on Microstructural Evolution of Ni-30Fe Alloy during Hot Deformation
• Effect of Initial Grain Orientation on Evolution of Deformed Microstructure in Hot Compressed Ni-30Fe Alloy
• N and P Losses from a Paddy Field Plot in Central Korea
• Balance of Nitrogen and Phosphorus in a Paddy Field of Central Korea
• Orientation Distribution of Proeutectoid Ferrite Nucleated at Prior Austenite Grain Boundaries in Vanadium-added Steel
• Inhibitory Effects of Long-Term Administration of Ferulic Acid on Microglial Activation Induced by Intracerebroventricular Injection of β-Amyloid Peptide (1-42) in Mice(Pharmacology)
• Dynamic and stable reconfiguration of self-reconfigurable planar parallel robots
• Self-reconfigurable planar parallel robot in the horizontal plane
• Effect of Anion Composition of Simulated Acid Rain on Nutrient Behavior in Reclaimed Saline Soils

もっと見る 閉じる

スポンサーリンク