Greenhouse production of chilies requires constant irrigation and fertilization. Due to climate change, water availability is decreasing, and thus new techniques are being developed, one of which is deficit irrigation, also applied in controlled conditions, such as greenhouse production This allows us to improve yield quality with minimal or no reduction in yield with optimal water use. Nitrogen is an important macronutrient whose uptake can be hindered under deficit irrigation because deficit is a form of drought stress. In the pot experiment, two chili cultivars were tested to see how they responded to water deficit irrigation treatments compared to the field capacity treatment with peat substrate. Nitrogen fertilization, with the addition of the isotope ¹⁵N, was applied to all treatments. Seeds and leaves contained the most total nitrogen in both cultivars, followed by placenta. N utilization from fertilization was 3.32% at field capacity and 2.33% under deficit irrigation in 'Chili-AS Rot'. 'Naga Morich' utilized 4.58% of N from fertilizer under field capacity and 6.72% under deficit irrigation. Capsaicinoid content was strongly correlated with nitrogen content in both cultivars irrespective of irrigation regime. This study fills an important gap in our understanding of N assimilation, fertilization, and irrigation in chili plants. It shows that there is no universal rule for N absorption under different irrigation conditions in chili plants and that the right choice of cultivar and species is crucial for optimal and high-quality chili fruit production.

辣椒的温室生产需要不断的灌溉和施肥。由于气候变化，可用水量正在减少，因此正在开发新技术，其中一项是亏缺灌溉，也适用于受控条件，例如温室生产。最佳用水。氮是一种重要的常量营养素，其吸收在亏缺灌溉下会受到阻碍，因为亏缺是干旱胁迫的一种形式。在盆栽试验中，对两个辣椒品种进行了测试，以了解与使用泥炭基质进行田间容量处理相比，它们对缺水灌溉处理的反应如何。氮肥，添加同位素¹⁵N，应用于所有处理。种子和叶子在两个品种中的总氮含量最高，其次是胎盘。在“Chili-AS Rot”中，施肥氮利用率在田间持水量下为 3.32%，在亏缺灌溉下为 2.33%。'Naga Morich' 在田间持水量下利用了 4.58% 的肥料，在亏缺灌溉下利用了 6.72%。无论灌溉制度如何，辣椒素含量都与两个品种的氮含量密切相关。这项研究填补了我们对辣椒植物中氮同化、施肥和灌溉的理解的重要空白。结果表明，辣椒植株在不同灌溉条件下对氮的吸收没有普遍规律，正确选择品种和品种是获得优质辣椒果实的关键。