ABSTRACT Cordia sinensis Lam is a multipurpose underutilized species of arid and semiarid regions. It is commonly propagated through seeds, but germination percentage is low (50–60%) and erratic. Therefore, an investigation was undertaken to standardize the propagation technique during year 2016 at CAZRI RRS Bhuj, India. The seeds of Cordia gharaf were treated with gibberellic acid (four levels: 0, 250, 500, and 1000 ppm) and potassium nitrate (four levels: 0%, 0.25%, 0.5%, and 1%) singly or in combination and it was found that combined application of GA3 and KNO3 enhanced seed germination synergistically (p = .05). The treatment consisted of GA3 250 ppm and KNO3 (1%) resulted in earliest seed germination (4.33 ± 0.33 days), maximum seed germination percentage (79.47%), and subsequent seedling growth e.g. highest leaf area (25.52 ± 1.41 cm2), and maximum leaf fresh (1.59 g) and dry weight (0.72 g). However, maximum plant height was observed under GA3 500 ppm and KNO3 (1%) treatment. In conclusion, the combination treatment of GA3 250 ppm and KNO3 1% is an effective and practical method for improving C. sinensis seed germination.

中文翻译：

---

赤霉酸和硝酸钾促进灰叶碟果（Cordia Sinensis Lam.）幼苗的种子萌发和生长

摘要 Cordia sinensis Lam 是干旱和半干旱地区的一种多用途未充分利用的物种。它通常通过种子繁殖，但发芽率低（50-60%）且不稳定。因此，2016 年在印度 CAZRI RRS Bhuj 进行了一项调查以标准化传播技术。Cordia gharaf 的种子用赤霉酸（四个水平：0、250、500 和 1000 ppm）和硝酸钾（四个水平：0%、0.25%、0.5% 和 1%）单独或组合处理，并且发现 GA3 和 KNO3 的联合施用可协同促进种子发芽 (p = .05)。由 GA3 250 ppm 和 KNO3 (1%) 组成的处理导致最早的种子发芽 (4.33 ± 0.33 天)、最大的种子发芽百分比 (79.47%) 和随后的幼苗生长，例如最高的叶面积 (25.52 ± 1.41 cm2)，最大鲜叶 (1.59 g) 和干重 (0.72 g)。然而，在 GA3 500 ppm 和 KNO3 (1%) 处理下观察到最大植物高度。综上所述，GA3 250 ppm和KNO3 1%的联合处理是提高中华白菜种子萌发率的有效且实用的方法。