ABSTRACT In New Zealand horticulture there is a widely-held opinion that target soil test P (Olsen P) values increase with soil anion storage capacity (ASC) – an idea that arose in the 1986 Fertiliser Recommendations of Wood et al. with little supporting evidence. We report a direct test of whether ASC influences plant response to soil Olsen P. This was carried out with three soils of different ASC values (14%, 75% and 92%) under glasshouse conditions where supply of other nutrients was not limiting. For each soil we generated samples with 10 different Olsen P values. These were then used to grow spring onion (Allium fistolosum L.) in 0.25-L containers kept moist with P-free nutrient solution. The Olsen P values ranged from 3 to 51 μg g−1. Plant growth varied strongly with soil Olsen P, but regression slopes for plant mass on Olsen P showed no differences associated with ASC. A further analysis filtered out possible effects of variations in pH and the mass of soil in each pot. Again this indicated no influence of ASC on plant responsiveness to Olsen P. Our results suggest caution in using the 1986 recommendations for determining application rates of P fertiliser for vegetables.

中文翻译：

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土壤负离子储存能力是否会影响植物对 Olsen P 状态的反应？

摘要 在新西兰园艺界，普遍认为目标土壤测试 P (Olsen P) 值随着土壤阴离子储存能力 (ASC) 的增加而增加——这一想法出现在 1986 年 Wood 等人的肥料建议中。几乎没有证据支持。我们报告了 ASC 是否影响植物对土壤 Olsen P 的反应的直接测试。这是在其他养分供应不受限制的温室条件下对三种不同 ASC 值（14%、75% 和 92%）的土壤进行的。对于每种土壤，我们生成了具有 10 个不同 Olsen P 值的样本。然后将它们用于在用无磷营养液保持湿润的 0.25 升容器中种植葱 (Allium fistolosum L.)。Olsen P 值的范围为 3 到 51 μg g-1。植物生长随土壤 Olsen P 的不同而变化很大，但 Olsen P 上植物质量的回归斜率显示与 ASC 没有差异。进一步的分析过滤掉了每个盆中 pH 值和土壤质量变化的可能影响。这再次表明 ASC 对植物对 Olsen P 的反应没有影响。我们的结果表明，在使用 1986 年建议确定蔬菜磷肥施用率时要谨慎。