Bio-availability of phosphorus fertilizers in acid paddy soils with different P status
Pot experiments on three acid paddy soils with different P status were conducted to investigate the effects of P fertilizers on ryegrass growth and changes of soil P fractions after ryegrass planting. The results show that application of P fertilizers increased dry matter weight and P uptake of ryeg...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Zhejiang University Press
2009-03-01
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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.1008-9209.2009.02.015 |
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| Summary: | Pot experiments on three acid paddy soils with different P status were conducted to investigate the effects of P fertilizers on ryegrass growth and changes of soil P fractions after ryegrass planting. The results show that application of P fertilizers increased dry matter weight and P uptake of ryegrass on low-P status soils (NK and CK) by 32.7%-53.0% and 82.4%-151.9%, respectively; on high-P status soil (NPK) by 11.0%-14.0% and 51.1%-65.0%, respectively. Dry matter weight and P uptake of ryegrass on NPK soil were higher than that on NK and CK soil under the same fertilizer treatment. Average agronomic efficiency of P fertilizer (AEP) for KPR<sub>500</sub>, KPR<sub>1000</sub> and SSP<sub>22</sub> on three soils were 5.6, 2.5 and 124.2, respectively; average recovery efficiency of P fertilizer (REP) for KPR<sub>500</sub>, KPR<sub>1000</sub> and SSP22 on three soils were 1.0, 0.7 and 21.1, respectively. Compared with the control (no P application), soil available P (Resin-P, NaHCO<sub>3</sub>-Pi and NaHCO<sub>3</sub>-Po) increased at different grade on the three soils after P fertilizers application. Soil NaOH-Pi also increased, while soil NaOH-Po was stable and less affected by addition of P fertilizers. Phosphate rock application increased soil HCl-P and Residual-P fractions substantially. |
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| ISSN: | 1008-9209 2097-5155 |