Efficient nitrogen (N) nutrition has been reported to have the potential to alleviate the drought stress damages by maintaining metabolic activities even at low tissue water potential. The goal of our research was to find a correlation on the genotype level between the effect of different amounts of nitrogen nutrition and water supply at different growth stages. A small-plot experiment was established with three maize hybrids and three levels of nitrogen, and two different amounts of water supply were applied during the vegetation period of 2018 and 2019. Chlorophyll fluorescence parameters were detected, as well as potential and actual photochemical efficiency of PSII, at three growth stages: eight-leaf stage, tasseling, silking. At physiological maturity, the yield of hybrids was also measured. While only genotype differences were described among the investigated parameters in the V8 stage, treatment effects were also realized based on the measured chlorophyll fluorescence parameters during the tasseling and silking stages. Beyond the significant effect of irrigation, a similar impact was declared in the case of 80 kg ha⁻¹ N treatment at the later growth stages. Pronounced correlation was described between chlorophyll fluorescence parameters and yield mainly under irrigated conditions. Our result suggested that lower N nutrition may be sufficient mainly under irrigated conditions, and in vivo chlorophyll fluorescence parameters are appropriate for detecting the effect of environmental factors in different growth stages.

中文翻译：

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利用叶绿素荧光参数评估玉米不同生育期缺水的氮营养状况。

据报道，即使在低组织水势下，有效的氮（N）营养也可能通过维持代谢活动来减轻干旱胁迫的损害。我们研究的目的是找到不同生育阶段不同氮素营养水平与供水之间基因型水平的相关性。建立了三个玉米杂交种和三个氮水平的小样试验，在2018年和2019年的植被期应用了两种不同的供水方式。检测了叶绿素荧光参数，以及潜在的和实际的光化学效率。 PSII处于三个生长阶段：八叶阶段，抽穗，silk丝。在生理成熟时，还测量了杂种的产量。虽然仅描述了在V8阶段所研究参数之间的基因型差异，但基于在抽穗和抽穗阶段测得的叶绿素荧光参数也实现了治疗效果。除了灌溉的显着影响外，在80千克公顷的土地上也宣布了类似的影响在后期生长阶段进行^-1 N处理。主要在灌溉条件下，叶绿素荧光参数与产量之间存在明显的相关性。我们的结果表明，低氮营养主要在灌溉条件下可能就足够了，体内叶绿素荧光参数适用于检测不同生长阶段环境因素的影响。