Effect of phosphate fertilizer-coated Dicarboxylic Acid Polymer on rice yield  and components under greenhouse conditions

Tran Van  Hung; Ngo Ngoc Hung; Vo Quang Minh

doi:10.14719/pst.2610

Authors

Tran Van Hung Department of Land Resources, College of Environment and Natural Resources, Can Tho University, Can Tho City, 90000, Viet Nam https://orcid.org/0009-0005-4175-3214
Ngo Ngoc Hung Department of Soil Science, College of Agricultural, Cantho University, Can Tho City, 90000, Viet Nam https://orcid.org/0000-0002-6378-0417
Vo Quang Minh Department of Land Resources, College of Environment and Natural Resources, Can Tho University, Can Tho City, 90000, Viet Nam https://orcid.org/0000-0001-8574-7151

DOI:

https://doi.org/10.14719/pst.2610

Keywords:

Dicarboxylic Acid Polymer (DCAP), available phosphorus, rice, phosphate fertilizer, phosphorus absorption

Abstract

A significant amount of phosphorus (P) becomes fixed by aluminium (Al) and iron (Fe) in acidic soils, leading to decreased efficiency in P utilization and subsequently lowering crop yield. Enhanced P fertilization offers a potential solution, as the dicarboxylic acid polymer (DCAP) coating on P fertilizer promotes increased plant productivity and more effective P utilization. The improvement achieved through enhanced P fertilization can contribute to higher rice yields in acidic soils, accompanied by an increase in P solubility. The study aimed to determine the impact of DCAP-mixed phosphate fertilizer on P uptake by plants, absorption efficiency, and rice yield. The results demonstrated a significant increase in available P (about 3.5 mg P/kg) when DCAP was used in a greenhouse setting, resulting in elevated yields and total P absorption (ranging from 0.03 to 0.05 grams/pot). However, the addition of 60 kg of phosphate mixed with DCAP has not yet demonstrated a significant increase in available phosphorus in the soil compared to adding just 60 kg of phosphate. The application of phosphate at a dose of 30 kg of P₂O₅ mixed with DCAP for growth and phosphorus absorption yield results equivalent to using 60 kg of P₂O₅ without DCAP. Furthermore, the use of DCAP in conjuction with 50% P fertilizer increased P availability by the same amount as that achieved with 100% P fertilizer. Consequently, DCAP reduced chemical P fertilizer in the soil by approximately 50%. However, it is essential to evaluate the effectiveness of mixed phosphate fertilizer (DCAP) under field conditions before recommending its widespread use.

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Author Biographies

Tran Van Hung, Department of Land Resources, College of Environment and Natural Resources, Can Tho University, Can Tho City, 90000, Viet Nam

Ngo Ngoc Hung, Department of Soil Science, College of Agricultural, Cantho University, Can Tho City, 90000, Viet Nam

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