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This article in SSSAJ

  1. Vol. 68 No. 6, p. 1890-1895
     
    Received: Feb 24, 2004


    * Corresponding author(s): kangshaozhong@163.net
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doi:10.2136/sssaj2004.1890

Nitrogen Fertilization on Uptake of Soil Inorganic Phosphorus Fractions in the Wheat Root Zone

  1. Fucang Zhangacd,
  2. Shaozhong Kang *ab,
  3. Jianhua Zhangacd,
  4. Renduo Zhangacd and
  5. Fusheng Lie
  1. a Key Lab. of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Northwest Science and Technology Univ. of Agriculture and Forestry, Yangling, Shaanxi, 712100, China
    c Dep. of Biology, Hong Kong Baptist Univ., Kowloon Tong, Hong Kong
    d State Key Lab. of Water Resources and Hydropower Engineering Science, Wuhan Univ., Wuhan 430072, China and Dep. of Renewable Resources, Univ. of Wyoming, Laramie, WY 82071-3354, USA
    b College of Water Resources and Civil Engineering, China Agricultural Univ., Beijing, 100083, China
    e Agricultural College, Guangxi University, Nanning, Guangxi, China, 530005

Abstract

Plant nutrient uptake from the soil is dependent on fertilizers applied, soil chemicals, and other factors. The purpose of this study is to quantify the effects of applied N fertilizers on P uptake by winter wheat (Triticum aestivum L.) and on the change of soil pH in the root zone related to reductions of inorganic P fractions in the rhizosphere soil. An experiment was conducted using different forms of N fertilizers (i.e., NH4 +–N and NO3 –N) with three N concentrations (0, 100, and 300 mg kg−1) applied in a calcareous soil. Biomass and total N uptake of the plant increased with the N concentrations and NH4 +–N fertilizer resulted in a greater biomass than NO3 –N nutrition. Total P uptake in the plant was also higher with NH4 +–N fertilizer than with the NO3 –N nutrition. Compared with the zero N treatment, the soil pH around the roots decreased by 0.30 and 0.65 units, respectively, with N treatments of 100 and 300 mg kg−1 of NH4 +–N fertilizer. The amount of soil inorganic P fractions in the root zone decreased with increasing NH4 +–N applied. The NO3 –N treatments reduced rhizosphere acidification and had a less impact on the soil inorganic P fractions. The results suggest that enhancing rhizosphere acidification attributable to applications of NH4 +–N fertilizer can increase P availability in calcareous soils for plant uptake.

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