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| DOI：10.13522/j.cnki.ggps.2019410 |
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| The Combined Effects of Phosphorus Fertilizers Types and Activation Coefficient of Soil Phosphorous on Phosphorous Leaching from Chestnut Soil |
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QIN Yonglin, TIAN Yanhua, CHEN Yang, JIA Liguo, YU Jing, FAN Mingshou
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1. College of Agronomy, Inner Mongolia Agricultural University, Hohhot 010019, China;2. College of Grassland and Resource Environment, Inner Mongolia Agricultural University, Hohhot 010011, China
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| Abstract: |
| 【Background】Alleviating phosphorus leaching from soil not only reduces fertilizes waste in agricultural production but also ameliorates its detrimental impact on environment. Phosphorus leaching from farmland is affected by a multitude of abiotic and biotic factors, and understanding the combined effect of phosphorus fertilizer types and soil texture is important to develop efficient fertilizer use strategies to reduce phosphorus loss in agricultural production.【Objective】The purpose of this paper is to experimentally study phosphorous leaching from a chestnut soil as impacted by different phosphorous fertilizers applied to soil with contrasting phosphorus activation coefficient (PAC).【Method】The experiment was conducted in columns packed with two types of soils with different phosphorus activation coefficient. The fertilizers used in the experiment were monocalcium phosphate (MCP, P2O5 160 kg/hm2), monoammonium phosphate (MAP, P2O5 160 kg/hm2) and diammonium phosphate (DAP, P2O5 160 kg/hm2). During the experiment, we measured the change in total phosphorus (TP) and total dissolved phosphorus (TDP) in the leachate from each column.【Result】Phosphorus in the top 0~40 cm soil was leached. The TP concentration in the leachate from the soil with PAC of 7.72% was 1.91 times higher than that from the soil with PAC of 0.86% at early stage. The TDP was the dominant P in the leachate, accounting for 68.8%~82.9% of TP. Applying phosphate fertilizer to the soil with high PAC significantly increased P leaching, compared to applying to the soil with low PAC. Compared with MCP and MAP, DAP significantly increased P leaching. For all treatments, phosphorus loss from leaching was less than 2% of the applied phosphate fertilizer.【Conclusion】Phosphorous leaching from DAP was the highest among all three phosphorus fertilizers. The soil with high PAC risks phosphorous leaching when phosphate fertilizer was used. |
| Key words: phosphorus fertilizer; leaching loss; chestnut soil; phosphorus activation coefficient |
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