Salisu Jibia Sirajo, Panjama Kanokwan, Inkham Chaiartid, Sato Takashi, Ohtake Norikuni, Ruamrungsri Soraya
Department of Plant and Soil Sciences, Faculty of Agriculture, Chiang Mai University, Chiang Mai 50200, Thailand.
PhD. Horticulture Program, Department of Plant and Soil Sciences, Faculty of Agriculture Under the CMU Presidential Scholarship, Chiang Mai University, Chiang Mai 50200, Thailand.
Plants (Basel). 2025 Jan 18;14(2):265. doi: 10.3390/plants14020265.
Nitrogen (N) is an essential determinant of strawberry growth and productivity. However, plants exhibit varying preferences for sources of nitrogen, which ultimately affects its use efficiency. Thus, it is imperative to determine the preferred N source for the optimization of indoor strawberry production. This study employed the N-tracer technique to investigate the effects of N sources on N uptake, distribution, and use efficiency, as well as the plants' growth, for 'Praratchatan 80' strawberries in a greenhouse. Five treatments were applied: T1 (5.0 mM NO), T2 (2.5 mM NO + 2.5 mM NH), T3 (5.0 mM NH), T4 (2.5 mM NH + 2.5 mM NO), and T5 (N-free, control) in a completely randomized design. Significant ( < 0.05) differences were observed in N uptake and distribution and total N concentration among the treatments. Sole NH promoted early N uptake and accelerated flowering, while NO enhanced vegetative growth and later-stage nitrogen use efficiency (NUE). The application of combined NO and NH was most efficacious, balancing the benefits of both N forms. NO treatment enhanced NUE by 46% compared to NH, and mixed N sources demonstrated superior and consistent NUE over time. NH, alone or with NO, expedited flowering by 20 days compared to sole NO and N-free treatments. This study elucidates the importance of the sources of N in optimizing strawberry growth and flowering, providing a foundation for developing tailored N-management strategies. Future research should focus on refining mixed N application ratios and timings, exploring molecular mechanisms of N metabolism, and evaluating long-term impacts on strawberry production sustainability.
氮（N）是草莓生长和产量的重要决定因素。然而，植物对氮源表现出不同的偏好，这最终会影响其利用效率。因此，确定室内草莓生产优化的首选氮源势在必行。本研究采用氮示踪技术，研究了氮源对‘Praratchatan 80’草莓在温室中氮吸收、分配、利用效率以及植株生长的影响。采用完全随机设计进行了5种处理：T1（5.0 mM NO）、T2（2.5 mM NO + 2.5 mM NH）、T3（5.0 mM NH）、T4（2.5 mM NH + 2.5 mM NO）和T5（无氮，对照）。各处理间在氮吸收、分配和总氮浓度方面存在显著（<0.05）差异。单独施用铵促进了早期氮吸收并加速了开花，而硝酸盐则促进了营养生长和后期氮利用效率（NUE）。硝酸盐和铵混合施用最为有效，平衡了两种氮形态的益处。与铵处理相比，硝酸盐处理使氮利用效率提高了46%，混合氮源随时间推移表现出卓越且稳定的氮利用效率。与单独施用硝酸盐和无氮处理相比，单独或与硝酸盐一起施用铵使开花提前了20天。本研究阐明了氮源在优化草莓生长和开花方面的重要性，为制定定制化的氮管理策略奠定了基础。未来的研究应集中在优化混合氮施用比例和时间、探索氮代谢的分子机制以及评估对草莓生产可持续性的长期影响。
