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Article

Effects of Phosphorus Fertilizer Application Rates on Colloidal Phosphorus Leaching in Purple Soil in Southwest China

1
College of Natural Resources and Environment, Northwest A&F University, No. 3, Taicheng Road, Xianyang 712100, China
2
College of Resources, Sichuan Agricultural University, 211, Huiming Road, Chengdu 611130, China
3
College of Forestry, Sichuan Agricultural University, 211, Huiming Road, Chengdu 611130, China
*
Author to whom correspondence should be addressed.
Academic Editor: Domenico Cicchella
Water 2022, 14(15), 2391; https://doi.org/10.3390/w14152391
Received: 1 July 2022 / Revised: 19 July 2022 / Accepted: 29 July 2022 / Published: 2 August 2022
Phosphorus (P) lost via leaching from agricultural land is of major concern for water resource managers worldwide, and colloidal phosphorus (CP) may have a high contribution, since it is an important mobile form of P in soil and subsurface drainage. The objective of this study is to relate P fertilization application rates to CP leaching. To eliminate the influence of climate and facilitate the accurate measurement of P contents in different soil layers, we established soil columns to investigate the impacts of fertilizer application rates and timing on P leaching. Therefore, a soil column leaching experiment was undertaken with different P fertilization application rates (0, 20, 40, 100, 200, and 400 mg kg−1) for purple soil in southwest China. P application rates had significant effects on CP and dissolved phosphorus concentrations in the top soils (p < 0.05) (e.g., 0–10 cm in this study), and they further increased P leaching loss by 24–375%. CP was the dominant P form and contributed 31–61% to total phosphorus in the leachate. The concentration of different P forms in leachates decreased significantly over time, and the risk of P leaching loss was greater within two weeks after P application (p < 0.05). The advisable range of P application rate is recommended to be 0–450 kg ha−1 for agricultural practice, and it is also recommended to keep P fertilizer in the soil for more than two weeks. Some countermeasures, related to application rates and timing, should be taken to minimize the buildup of P in the field and reduce the risk of P leaching. View Full-Text
Keywords: phosphate fertilizer; colloidal phosphorus; leaching loss; purple soil; soil depth; column study phosphate fertilizer; colloidal phosphorus; leaching loss; purple soil; soil depth; column study
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MDPI and ACS Style

He, X.; Zheng, Z.; Li, T.; He, S.; Li, Z. Effects of Phosphorus Fertilizer Application Rates on Colloidal Phosphorus Leaching in Purple Soil in Southwest China. Water 2022, 14, 2391. https://doi.org/10.3390/w14152391

AMA Style

He X, Zheng Z, Li T, He S, Li Z. Effects of Phosphorus Fertilizer Application Rates on Colloidal Phosphorus Leaching in Purple Soil in Southwest China. Water. 2022; 14(15):2391. https://doi.org/10.3390/w14152391

Chicago/Turabian Style

He, Xiaoling, Zicheng Zheng, Tingxuan Li, Shuqin He, and Zhi Li. 2022. "Effects of Phosphorus Fertilizer Application Rates on Colloidal Phosphorus Leaching in Purple Soil in Southwest China" Water 14, no. 15: 2391. https://doi.org/10.3390/w14152391

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