Phosphorus status and index for predicting environmental risk of phosphorus leaching in typical vegetable soils of Hangzhou
Chemical analysis was used to study soil phosphorus status and the relationships between agronomic and environmental soil P tests in order to develop an index to assess the environmental risk of P loss potential in typical vegetable soils collected from suburb of Hangzhou. The results show that tota...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Zhejiang University Press
2008-03-01
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| Series: | 浙江大学学报. 农业与生命科学版 |
| Subjects: | |
| Online Access: | https://www.academax.com/doi/10.3785/j.issn.1008-9209.2008.02.014 |
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| Summary: | Chemical analysis was used to study soil phosphorus status and the relationships between agronomic and environmental soil P tests in order to develop an index to assess the environmental risk of P loss potential in typical vegetable soils collected from suburb of Hangzhou. The results show that total soil P (TP) and soil-test P measured with CaCl<sub>2</sub>-P, Olsen-P and P<sub>M3</sub> with a wide range were 0.7-2.9 g·kg<sup>-1</sup>, 0.48-19.64 mg·kg<sup>-1</sup>, 10.65-151.60 mg·kg<sup>-1</sup> and 50.53-904.95 mg·kg<sup>-1</sup>, respectively. Of all the tested soils, 72% soils with Olsen-P exceeded agronomically optimum critical level of 60 mg·kg<sup>-1</sup>. DPSox ranged from 6.91% to 49.15% and DPS<sub>M3</sub> ranged from 5.82% to 52.56%. Positive significant relationships were observed between DPS and TP, Olsen-P and P<sub>M3</sub>. Two methods of DPS calculations were linearly related to another. A split-line mode related soil soluble P concentrations to the Olsen-P concentrations and DPS, indicating that the respective change points were: Olsen-P=76.19 mg·kg<sup>-1</sup>, DPSox=26%, and DPS<sub>M3</sub>=22%. Soluble P loss in leaching may be greater in soils with Olsen-P and DPS values that exceed these thresholds than in soils with lower Olsen-P and DPS values. More than 60% of the tested soils exceeded the above Olsen-P and DPS thresholds. It indicated that the environmental Olsen-P threshold is above agronomic optimum soil Olsen-P test value, and therefore, if agricultural soils are below these environmental Olsen-P and DPS thresholds, then adequate crop P supply and environmental protection can both be achieved. |
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| ISSN: | 1008-9209 2097-5155 |