Chen Chen, Xiang Yue, Jiao Xiaoqiang, Gong Haiqing
Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering, National Observations and Research Station for Wetland Ecosystems of the Yangtze Estuary, College of Life Sciences, Fudan University, Shanghai, China.
College of Resources and Environmental Sciences, National Academy of Agriculture Green Development, Key Laboratory of Plant-Soil Interactions, Ministry of Education, Key Laboratory of Low-carbon Green Agriculture, Ministry of Agriculture and Rural Affairs, China Agricultural University, Beijing, China.
Front Plant Sci. 2024 Aug 14;15:1451073. doi: 10.3389/fpls.2024.1451073. eCollection 2024.
High-concentration phosphorus (P) fertilizers are crucial for crop growth. However, fertilizers with lower P concentrations, such as calcium magnesium phosphate (CMP) and single super phosphate (SSP), can also serve as efficient P sources, especially when blended with high-concentration P fertilizers like diammonium phosphate (DAP) or monoammonium phosphate (MAP). In this study, we conducted a 48-day pot experiment to explore how blending low-P fertilizers could optimize maize P utilization, using CMP to replace DAP in acidic soil, and SSP to replace MAP in alkaline soil, with five SSP+MAP and CMP+DAP mixtures tested. Key metrics such as shoot and root biomass, shoot P uptake, root length, and soil P bioavailability were measured. We found that maize biomass and P uptake with 100% DAP were comparable to those with 50% CMP and 50% DAP in acidic soil. Similar results were observed for 100% MAP compared to 50% SSP and 50% DAP in alkaline soil. Root biomass and length were largest with 100% MAP in acidic soil and at 100% DAP in alkaline soil, with no significant differences at 50% SSP or CMP substitutions for MAP and DAP, respectively. Furthermore, 50% SSP or CMP substitutions for MAP and DAP increased the content and proportion of the labile inorganic P (Pi) pool (HO-Pi and NaHCO-Pi), had a direct and positive effect on Olsen-P. Our findings reveal that 1:1 blends of SSP and MAP in acidic soil, and CMP and DAP in alkaline soil, effectively meet maize's P requirements without relying solely on high-concentration P fertilizers. This indicates that strategic blending of fertilizers can optimize P use, which is crucial for sustainable agriculture.
高浓度磷肥对作物生长至关重要。然而，低磷浓度的肥料，如钙镁磷肥（CMP）和过磷酸钙（SSP），也可作为有效的磷源，特别是当与高浓度磷肥如磷酸二铵（DAP）或磷酸一铵（MAP）混合时。在本研究中，我们进行了一项为期48天的盆栽试验，以探索混合低磷肥料如何优化玉米对磷的利用，在酸性土壤中用CMP替代DAP，在碱性土壤中用SSP替代MAP，并测试了五种SSP+MAP和CMP+DAP混合物。测量了地上部和根部生物量、地上部磷吸收、根长和土壤磷生物有效性等关键指标。我们发现，在酸性土壤中，100% DAP的玉米生物量和磷吸收与50% CMP和50% DAP的相当。在碱性土壤中，100% MAP与50% SSP和50% DAP相比也观察到类似结果。在酸性土壤中，100% MAP时根生物量和根长最大，在碱性土壤中100% DAP时最大，分别用50% SSP或CMP替代MAP和DAP时无显著差异。此外，用50% SSP或CMP替代MAP和DAP增加了不稳定无机磷（Pi）库（HO-Pi和NaHCO-Pi）的含量和比例，对Olsen-P有直接的正向影响。我们的研究结果表明，在酸性土壤中SSP和MAP以1:1混合，在碱性土壤中CMP和DAP以1:1混合，无需仅依赖高浓度磷肥就能有效满足玉米的磷需求。这表明肥料的策略性混合可以优化磷的利用，这对可持续农业至关重要。
