1. Soil phosphorus and relationship to phosphorus balance under long-term fertilization.
- Author
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BENHUA SUN, QUANHONG CUI, YUN GUO, XUEYUN YANG, SHULAN ZHANG, MINGXIA GAO, and HOPKINS, DAVID W.
- Subjects
PHOSPHORUS in soils ,SOIL testing ,ORGANIC fertilizers ,PLANT-soil relationships ,SOIL composition ,POTASSIUM - Abstract
Temporal changes in the concentrations of plant-available phosphorus (P) in soil (Olsen-P), total soil-P and P activation coefficient (the ratio of Olsen-P to residual-P (i.e. an approximation to total-P)) were measured in plots that received consistent inorganic nitrogen, phosphorus and potassium plus organic fertilizers annually. Maize and winter wheat crops were grown in rotation for 24 years. Olsen-P and P activation coefficient declined significantly in the earlier years (< 12 years) for treatments that did not include any P fertilizer, and increased over the same period for the P-fertilized treatments. The rates of change in the Olsen-P and P activation coefficient values were positively related to P balance. In the later years, the Olsen-P and P activation coefficient plateau values were positively related to the P balance. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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