Intercropping (IC) can reduce nitrogen fertilizer requirements, supress weeds, and improve crop yields and yield stability. Three field trials were conducted in Denmark in 2018 with intercropping and sole crops (SC) using spring wheat, barley, faba bean and field pea to compare productivity under five fertilizer levels. The trials were carried out using in a split-plot design with four. Anomalous weather during the 2018 cropping season created drought conditions and high temperatures above 31 degrees C. No effect of fertilizer treatment was found, and total dry matter and grain yields were supressed in all systems. Wheat grain yields averaged 2.14 t ha(-1) across systems, ranging from 1.58 t ha(-1) as a component of the IC to 2.44 t ha(-1) as SC, and barley grain yields averaged 2.35 t ha(-1). Faba bean yielded 1.78 t ha(-1) as SC, but failed in the IC. Pea failed in both systems. Intercropping barley with cover crops had no effect on grain yield or total dry matter. These results suggest that intercropping provided no production advantage during a drought and illuminate the need to continue conducting research and breeding on drought-resistant cultivars.
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机译：间作可以减少氮肥需求，抑制杂草，提高作物产量和产量稳定性。2018 年在丹麦进行了三次田间试验，使用春小麦、大麦、蚕豆和大田豌豆进行间作和单作 （SC），以比较五种肥料水平下的生产力。试验采用四块分割地设计进行。2018年种植季节的异常天气造成了干旱条件和31°C以上的高温，没有发现肥料处理的效果，所有系统的总干物质和籽粒产量都受到抑制。不同系统的小麦籽粒平均产量为2.14吨公顷（-1），从1.58吨公顷（-1）作为IC的组成部分到2.44吨公顷（-1）作为SC，大麦籽粒平均产量为2.35吨公顷（-1）。蚕豆产量为1.78 t ha（-1），但未能成功。豌豆在两个系统中都失败了。大麦与覆盖作物间作对籽粒产量和总干物质均无影响。这些结果表明，间作在干旱期间没有提供生产优势，并阐明了继续对抗旱品种进行研究和育种的必要性。
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