ABSTRACT

To examine the effect of humic acid and nano-chelate iron on the absorption of some nutrients and oil content and essential oil of (Nigella sativa) under two-year experimental drought stress (2018-and 2019-) in Agricultural and Natural Resources Research Station of Eqlid city, an experiment was conducted as a split factorial design in the form of a randomized complete block design with three replications. The main plots included irrigation at three levels (50, 75, and 100% of available water), sub-factors including humic acid at three levels (0, 250, and 500 mg/l), and nano-chelate iron at three levels (0, 1, and 2 g/l). The results revealed that drought stress decreased nutrient absorption and the amount of essential oil and oil content. Applying humic acid and nano-chelate iron decreased the effects of stress so that the application of humic acid and nano-chelate iron increased the yield by 21 and 27% compared to the control treatment. Interaction of humic acid, nano-chelate iron showed that the highest grain yield (1036) kg/ha) was observed in 500 mg/l of humic acid and 2 g/l of nano-chelate iron with 75% of available water. In general, it can be concluded that the use of humic acid and nano-chelate iron in conditions of water scarcity caused more absorption of nutrients, increased grain yield, and moderated the effects of drought stress compared to the control.

摘要

考察腐植酸和纳米螯合铁对黑种草某些营养物质和含油量及精油吸收的影响) 在 Eqlid 市农业和自然资源研究站的两年实验干旱胁迫（2018 年和 2019 年）下，以具有三个重复的随机完全区组设计的形式作为分裂因子设计进行了实验。主要地块包括三个水平的灌溉（50、75和100%的可用水），包括三个水平（0、250和500 mg/l）的腐植酸和三个水平的纳米螯合铁的子因素（0、1 和 2 克/升）。结果表明，干旱胁迫降低了养分的吸收以及精油的含量和含油量。施用腐植酸和纳米螯合铁降低了胁迫的影响，施用腐植酸和纳米螯合铁比对照处理分别提高了21%和27%的产量。腐植酸的相互作用，纳米螯合铁表明，在 500 mg/l 腐植酸和 2 g/l 纳米螯合铁和 75% 的可用水条件下，谷物产量最高（1036 kg/ha）。总体而言，可以得出结论，与对照相比，在缺水条件下使用腐植酸和纳米螯合铁会导致更多的养分吸收，增加粮食产量，并减轻干旱胁迫的影响。