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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

View larger version (15K): [in a new window]   Fig. 1. Schematic plot of rhizobox.

View larger version (26K): [in a new window]   Fig. 2. The pH values in the rhizosphere soil versus distance from the soil–root interface with the different N treatments. The treatments included applications of three N concentrations (0, 100, 300 mg N kg–1) with (NH4)2SO4 and KNO3 .

View larger version (25K): [in a new window]   Fig. 3. Concentrations of (A) Ca2–P and (B) Ca8–P extracted from the wheat rhizosphere soil with the different N treatments. The treatments included applications of three N concentrations (0, 100, 300 mg N kg–1) with (NH4)2SO4 and KNO3 .

View larger version (25K): [in a new window]   Fig. 4. Concentrations of (A) Al-P and (B) Fe-P extracted from the wheat rhizosphere soil with the different N treatments. The treatments included applications of three N concentrations (0, 100, 300 mg N kg–1) with (NH4)2SO4 and KNO3 .

View larger version (22K): [in a new window]   Fig. 5. Concentrations of total P extracted from the wheat rhizosphere soil with the different N treatments. The treatments included applications of three N concentrations (0, 100, 300 mg N kg–1) with (NH4)2SO4 and KNO3 .