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Division S-4—Soil Fertility & Plant Nutrition

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

^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
^b College of Water Resources and Civil Engineering, China Agricultural Univ., Beijing, 100083, 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
^e Agricultural College, Guangxi University, Nanning, Guangxi, China, 530005

^* Corresponding author (kangshaozhong{at}163.net)

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.

Abbreviations: Al-P, sterretite • ANOVA, analysis of variance • Ca₂–P, dicalcium phosphate • Ca₈–P, octocalcium phosphate • Ca₁₀–P, hydroxyapatite • Fe-P, tinticite • O-P, the occluded phosphate

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