Irrigation method and device for improving soil phosphorus bioavailability in root zone during crop growth period

By using intermittent, low-dose, periodic irrigation of oxalic acid in combination with the application of phosphorus-containing water-soluble fertilizer, the problem of safe and convenient combined use of oxalic acid during crop growth has been solved, achieving a continuous improvement in soil phosphorus bioavailability and reducing operating costs and drip irrigation system risks.

CN120036100BActive Publication Date: 2026-04-07SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-11-24
Publication Date
2026-04-07

AI Technical Summary

Technical Problem

During the crop growth period, oxalic acid is difficult to combine with phosphorus-containing fertilizers safely and conveniently, which makes it difficult to improve the bioavailability of soil phosphorus, and the operation cost is high, with the risk of drip irrigation system blockage.

Method used

Oxalic acid is applied in an intermittent, low-dose, periodic irrigation manner, and phosphorus-containing water-soluble fertilizer is applied within 0 to 30 minutes. Combined with specific irrigation devices, including conventional and low-calcium irrigation pools, oxalic acid solution pools, phosphorus-containing fertilizer pools, irrigation pumps, and drip irrigation tapes, the soil physicochemical properties are regulated through five operating modes to avoid the formation of oxalic acid precipitation.

Benefits of technology

It significantly reduced the formation of calcium oxalate precipitation, improved the bioavailability of phosphorus in the root zone soil, reduced the need for phosphorus application, and promoted sustainable production in facility agriculture.

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Abstract

This invention belongs to the field of agricultural production and environmental protection. Specifically, it is an irrigation method and device for improving the bioavailability of phosphorus in the root zone soil during the crop growth period. During the crop growth period, oxalic acid is applied intermittently, in low doses, and periodically to the crop root zone soil, and phosphorus-containing water-soluble fertilizer is applied simultaneously or within 0 to 30 minutes thereafter. This method safely, moderately, and continuously improves the bioavailability of exogenous and endogenous phosphorus in the root zone soil, reduces phosphorus application requirements, and mitigates the adverse effects of excess phosphorus in the soil.
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Citation Information

Patent Citations

  • Method for activating phosphorus in dry land soil

    CN110963852A

  • Fertilizing method for agricultural irrigation

    WO2006131056A1