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Investigating the relationships between soil acidity and phosphorus fractions in high country farmland of New Zealand
Soil Research ( IF 1.6 ) Pub Date : 2021-03-24 , DOI: 10.1071/sr20187
Daniel L. Hendrie , Jim L. Moir , Gustavo Boitt , Zachary P. Simpson , Leo M. Condron

Soil fertility remains a limitation to pasture production in the South Island high country of New Zealand, despite a strong history of aerial superphosphate fertiliser applications. This may in part be due to the acidic nature of these soils. This study of extensively farmed high country soils (n = 19) aimed to investigate the current status of soil fertility, and to quantify the effects soil acidity and exchangeable aluminium (Al) have on the accumulation of phosphorus (P) in these soils. To a depth of 7.5 cm, mean soil pHH2O across these soils was 5.2 ± 0.1, and exchangeable Al concentrations increased exponentially as pH decreased (R2 = 0.87), exceeding 3 mg kg–1 at pHH2O ≤ 5.1. Sulfur (S) concentrations were highly deficient for pasture production in these high country soils, with sulfate S (SO4-S) and organic S (Org-S) only exceeding 10 mg kg–1 at 6 and 3 out of the 19 sites, respectively. Total soil P concentrations, measured by Hedley fractionation, ranged from 587 to 1570 mg P kg–1, but only 7.2 ± 0.5% of this P was plant-available P (20.1–152 mg P kg–1). The greatest concentrations of P that these soils contained were in the moderately-labile organic P fraction (176–730 mg P kg–1), which may have the potential to become available due to organic matter mineralisation following liming. However, using Pearson’s correlations and principal component analysis, no strong correlations between the quantities or proportions of P contained in each P fraction were found due to the acidity or concentrations of exchangeable Al in these soils. This suggests that liming these soils is unlikely to result in substantial increases in plant P availability from the mineralisation of P in non-labile soil P fractions.



中文翻译:

新西兰高郊农田土壤酸度与磷含量之间的关系研究

尽管在空中施用过磷酸钙肥料已有悠久的历史,但土壤肥力仍然限制了新西兰南岛高地国家的牧草生产。这可能部分是由于这些土壤的酸性所致。这项针对广泛耕种的高乡村土壤(n = 19)的研究旨在调查土壤肥力的现状,并量化土壤酸度和可交换铝(Al)对这些土壤中磷(P)积累的影响。到7.5 cm的深度,这些土壤的平均土壤pH H2O为5.2±0.1,并且随着pH的降低,可交换的Al浓度呈指数增加(R 2 = 0.87),在pH H2O时超过3 mg kg –1≤5.1。在这些偏高的乡村土壤中,牧草生产中的硫(S)浓度极度不足,在19个地点中的第6和第3个地点,硫酸盐S(SO 4 -S)和有机S(Org-S)仅超过10 mg kg –1, 分别。通过Hedley分馏法测得的土壤总磷浓度范围为587至1570 mg P kg –1,但其中只有7.2±0.5%是植物可利用的P(20.1–152 mg P kg –1)。这些土壤中所含的P的最大浓度是在中等不稳定的有机P组分中(176–730 mg P kg –1),由于撒石灰后有机物会矿化,因此有可能变得可用。但是,使用Pearson相关性和主成分分析,由于这些土壤中的酸度或可交换Al的浓度,每个P组分中P的含量或比例之间均未发现强相关性。这表明对这些土壤进行石灰化不太可能导致非不稳定土壤P组分中P的矿化,从而大大提高植物P的利用率。

更新日期:2021-03-29
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