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首页> 外文期刊>Journal of Environmental Management >Increasing plant availability of legacy phosphorus in calcareous soils using some phosphorus activators
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Increasing plant availability of legacy phosphorus in calcareous soils using some phosphorus activators

机译：使用某些磷活化剂提高石灰性土壤中遗留磷的植物利用率

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摘要

Legacy phosphorus (P) in soil, accumulated over several years of fertilizer application in excess of crop demand, represents a huge and largely untapped resource. P activators can increase the availability of this P to plants by accelerating its transformation into soluble P fractions. In this study, we evaluated the potentials of four "P activators" (oxalic acid, lignin, phytase and ascorbic acid) to increase plant available P in a laboratory incubation experiment with two P-deficient calcareous soils used for wheat production. Samples were analysed for Olsen P, phosphomonoesterase and with Hedley sequential P fractionation. All four treatments had significant effects on different soil P fractions. Oxalic acid mainly enhanced inorganic P (P_i) solubility from the HC1-extractable P pool. Lignin enhanced P lability from the NaOH-, HC1- and residual-P pools. Phytase and ascorbic acid principally affected the organic P fractions (P_o). Oxalic acid and lignin showed most potential to improve P (H_2O-P, NaHCO_3-Pi and NaHCO_3-P_o) availability, which increased by 110-419% and 4.1-122%, respectively. These findings illustrated the potential mechanisms responsible for P release associated with different P activators and reinforced the case for their use in increasing legacy P availability for agriculture in calcareous soils.
机译：土壤中的遗留磷（P）在肥料施用中累积了数年，超出了农作物的需求，是一种巨大且尚未开发的资源。 P活化剂可以通过加速其转化为可溶性P组分的方式来提高植物对P的利用率。在这项研究中，我们评估了四种“ P活化剂”（草酸，木质素，植酸酶和抗坏血酸）在两种小麦中使用的磷缺乏钙质土壤的实验室培养实验中增加植物有效磷的潜力。分析样品的Olsen P，磷酸单酯酶和Hedley顺序P分馏。所有四种处理对不同的土壤磷含量都有显着影响。草酸主要增强了HC1可萃取P库中无机P（P_i）的溶解度。木质素增强了NaOH-，HC1-和残留P池中的P不稳定性。植酸酶和抗坏血酸主要影响有机磷组分（P_o）。草酸和木质素显示出提高P（H_2O-P，NaHCO_3-Pi和NaHCO_3-P_o）利用率的最大潜力，分别增加了110-419％和4.1-122％。这些发现说明了与不同的P活化剂有关的P释放的潜在机制，并加强了其在石灰性土壤中用于农业的传统P利用率增加的案例。

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