Abstract Adequate plant nutrition is important to reduce costs and increase the crop yield. This study tried to verify the influence of Nitrogen (N) on plant biomass production and the yield of bell pepper grown in SLAB; quantify the N use efficiency (NUE), and to quantify the residual N concentration in the substrate after the end of the crop cycle. The experiment was carried out in a protected environment. Pepper seedlings were transplanted to SLAB bags containing 40 dm3 of substrate. The treatments consisted of six N rates (0, 1.5, 3.0, 4.5, 6.0, and 7.5 g plant−1) split into 10 fortnightly applications, in a randomized block design with four replications. The fruit yield was evaluated throughout the experiment and after the final harvest, the dry mass of leaves, stem, and root of the plant, the N content and accumulated, the residual nitrate and ammonium in the substrate, and the NUE were evaluated. The rate of 5.51 g plant−1 of N, corresponding to 355.5 kg ha−1, provided the maximum yield of commercial fruits of 1.57 kg plant−1 or 101.2 t ha−1. With increasing N rate, the residual nitrate concentration in the substrate increased and the NUE decreased.

中文翻译：

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不同施氮量施肥条件下种植甜椒的产量和氮素利用效率

摘要 充足的植物营养对于降低成本和提高作物产量非常重要。本研究试图验证氮 (N) 对 SLAB 中植物生物量产生和甜椒产量的影响；量化氮利用效率 (NUE)，并量化作物周期结束后基质中的残余氮浓度。实验在受保护的环境中进行。将辣椒幼苗移植到含有 40 dm3 基质的 SLAB 袋中。处理包括六个 N 比率（0、1.5、3.0、4.5、6.0 和 7.5 g 植物-1），每两周施用 10 次，采用随机区组设计，重复四次。在整个实验过程中评估果实产量，最终收获后，植物的叶子，茎和根的干重，N 含量和积累，评估基质中残留的硝酸盐和铵盐，以及 NUE。5.51 g 植物-1 氮的比率，对应于 355.5 kg ha-1，提供了 1.57 kg 植物-1 或 101.2 t ha-1 的最大商业果实产量。随着施氮量的增加，基质中残留的硝酸盐浓度增加，NUE降低。