Articles

ACCUMULATION OF NO3-N IN DEEP LAYERS OF DRY FARMLAND AND ITS AFFECTING FACTORS IN ARID AND SEMI-ARID AREAS

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  • 1.Institute of Soil and Water Conservation, Chinese Academy of Sciences and the Ministry of Water Resources, Yangling 712100,China;2. Northwest Science & Technology University of Agriculture & Forestry, Yangling 712100,China

Received date: 2002-02-20

  Revised date: 2003-02-24

  Online published: 2003-08-01

Abstract

Accumulation of NO3-N in deep layers is the unique of N cycle in rained farmland in the arid and semi-arid areas. Based on the long-term experiment, the effects of fertilization, crop, rainfall, tillage systems, rotation, and soil properties on the NO3-N accumulation were reviewed. The over application of nitrogen fertilizer and the precipitation of 400~800 mm mainly contributed to the NO3-N accumulation in the 100~300 cm depth. The NO3-N accumulation in the 100~300 cm depth was increased with the increase of N rates, fertilizer N incorporation with phosphate fertilizer could reduce the NO3-N accumulation. The nitrogen usage efficiency also affect NO3-N accumulation due to N uptake by crops, crop rotation and fallow crop could reduce the NO3-N accumulation. NO3-N accumulation was mainly developed in the soils with heavy texture. The clay mineral with large positive charge mainly contributes to NO3-N accumulation in the tropical soils. The further research emphases about the NO3-N accumulation in the deep depth were put forward as follows: bio-availability, transport in soil profile under rain fed or irrigation, the relation to crop root distribution and growth, and the effect of the NO3-N accumulation on soil properties and soil gas.

Cite this article

Guo Shengli,Zhang Wenju,Dang Tinghui,Wu Jinshui,Hao Mingde . ACCUMULATION OF NO3-N IN DEEP LAYERS OF DRY FARMLAND AND ITS AFFECTING FACTORS IN ARID AND SEMI-ARID AREAS[J]. Advances in Earth Science, 2003 , 18(4) : 584 -591 . DOI: 10.11867/j.issn.1001-8166.2003.04.0584

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