ABSTRACT

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°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.

摘要

间作（IC）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 年在丹麦进行了三项田间试验，使用春小麦、大麦、蚕豆和豌豆进行间作和单作作物 (SC)，以比较五种施肥水平下的生产力。

这些试验是在一个有四个的裂区设计中进行的。2018 年作物季节的异常天气造成了干旱条件和 31°C 以上的高温。

未发现施肥处理的影响，所有系统中的总干物质和谷物产量均受到抑制。整个系统的小麦谷物产量平均为 2.14 t ha ^-1，范围从作为 IC 的组成部分的1.58 t ha ^-1到作为 SC 的2.44 t ha ^-1，大麦谷物产量平均为 2.35 t ha ^-1。蚕豆产量为 1.78 t ha ^-1作为 SC，但在 IC 中失败。豌豆在两个系统中都失败了。大麦与覆盖作物间作对谷物产量或总干物质没有影响。这些结果表明间作在干旱期间没有提供生产优势，并说明需要继续对抗旱品种进行研究和育种。