The Jyndevad field experiment, initiated in 1942 on a coarse sand soil in South of Denmark, explores the effect of four liming levels (0, 4, 8 and 12 Mg lime ha−1). These were in 1944 combined with two levels of mineral phosphorus (P) fertilizer (0 and 15.6 kg P ha−1 year−1), with or without a high initial dose of 156 kg mineral P ha−1. This study assesses interactions between liming and P fertilization on soil pH, Olsen-P contents and barley yields covering the last three decades. Annual P application improved barley yield regardless of liming, but the optimal liming level differed from year to year. This emphasizes the need for long-term field experiments to detect the complex interactions between liming and P availability on crop performance. The initial high P dose in 1944 and annual P fertilization increased Olsen-P contents in soil. The unlimed soil with pH(CaCl2) values below 4 had the highest Olsen-P content. The Jyndevad Experiment now harbors wide gradients in soil P (Olsen-P contents: 9–82 mg P kg−1 soil) and pH (3.6–6.9), providing a unique research platform for future studies on interactions between liming and P fertilization on coarse sand soils. We present a selection of studies that have used the Jyndevad Experiment to illustrate the research potential of the experiment.

中文翻译：

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Jyndevad 实验：揭示粗砂土中石灰和磷肥之间的长期相互作用


Jyndevad 田间实验于 1942 年在丹麦南部的粗沙土上启动，探索了四个石灰水平（0、4、8 和 12 毫克石灰 ha-1）的影响。这些是在 1944 年与两个级别的矿物磷 （P） 肥料（0 和 15.6 kg P ha-1 year-1）相结合的，有或没有 156 kg 矿物 P ha-1 的高初始剂量。本研究评估了石灰和磷肥对过去三十年土壤 pH 值、Olsen-P 含量和大麦产量的相互作用。无论施石灰如何，年度施磷都能提高大麦产量，但最佳施石灰水平每年都不同。这强调了长期田间实验的必要性，以检测石灰和磷有效性对作物性能的复杂相互作用。1944 年初始高磷剂量和每年施用磷肥增加了土壤中 Olsen-P 的含量。pH（CaCl2） 值低于 4 的未石灰土壤 Olsen-P 含量最高。Jyndevad 实验现在在土壤 P（Olsen-P 含量：9-82 mg P kg-1 土壤）和 pH 值 （3.6-6.9） 中具有较大的梯度，为未来研究粗砂土壤上石灰和 P 施肥之间的相互作用提供了一个独特的研究平台。我们介绍了一些使用 Jyndevad 实验来说明该实验的研究潜力的研究。