Changes in Olsen Phosphorus Concentration and Its Response to Phosphorus Balance in Black Soils under Different Long-Term Fertilization Patterns

The Olsen phosphorus (P) concentration of a soil is a key index that can be used to evaluate the P supply capacity of the soil and to estimate the optimal P fertilization rate. A study of the relationship between the soil Olsen P concentration and the P balance (P input minus P output) and their var...

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Published in:PloS one 2015-07, Vol.10 (7), p.e0131713-e0131713
Main Authors: Zhan, Xiaoying, Zhang, Li, Zhou, Baoku, Zhu, Ping, Zhang, Shuxiang, Xu, Minggang
Format: Article
Language:English
Subjects:
Adsorption
Agriculture
Animal wastes
Corn
Engineering
Experiments
Fertilization
Fertilizers
Fertilizers - analysis
Hydrogen-Ion Concentration
Information management
Laboratories
Manure - analysis
Manures
Nitrogen
Nitrogen - chemistry
Nitrogen - metabolism
Organic matter
Organic soils
pH effects
Phosphorus
Phosphorus - chemistry
Phosphorus - metabolism
Plants - metabolism
Potassium
Potassium - chemistry
Potassium - metabolism
Soil - chemistry
Soil investigations
Soil organic matter
Soil sciences
Soils
Studies
Time Factors
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Summary:The Olsen phosphorus (P) concentration of a soil is a key index that can be used to evaluate the P supply capacity of the soil and to estimate the optimal P fertilization rate. A study of the relationship between the soil Olsen P concentration and the P balance (P input minus P output) and their variations among different fertilization patterns will help to provide useful information for proper management of P fertilization. In this paper, the two investigated long-term experiments were established on black soils in the northeast region of China. Six fertilization treatments were selected: (1) unfertilized (CK); (2) nitrogen only (N); (3) nitrogen and potassium (NK); (4) nitrogen and phosphorus (NP); (5) nitrogen, phosphorus, and potassium (NPK); and (6) nitrogen, phosphorus, potassium and manure (NPKM). The results showed that the average Olsen P concentrations in the black soils at Gongzhuling and Harbin (16- and 31-year study periods, respectively), decreased by 0.49 and 0.56 mg kg-1 a-1, respectively, without P addition and increased by 3.17 and 1.78 mg kg-1 a-1, respectively, with P fertilization. The changes in soil Olsen P concentrations were significantly (P
ISSN:1932-6203
1932-6203
DOI:10.1371/journal.pone.0131713