Inas Abd-Alrazek Saada*(1), Youssef Nemer (1), and Entessar Al Jbawi (1)
(1). PhD student, Department of Field Crops, Faculty of Agricultural Engineering, Damascus University, Syria.
(2). Assistant Professor, Department of Field Crops, Faculty of Agricultural Engineering, Damascus University.
(3). Senior Researcher, General Commission for Scientific Agricultural Research, Damascus, Syria.
(*Corresponding author: Inassaada@yahoo.com ).
Received: 01/09/2026 Accepted: 06/10/2026
Abstract
This study aimed to evaluate the performance of two quinoa (Chenopodium quinoa Willd.) cultivars, Giza-1 and Red Carina, under three within-row plant spacings (10, 15, and 20 cm) during the 2024/2025 and 2025/2026 growing seasons at Abu Jarash Farm, Faculty of Agriculture, Damascus University, Syria. The experiment was conducted using a split-plot design with three replicates. The evaluated traits included plant height, panicle length, stem diameter, grain weight per plant, grain yield, biological yield, and harvest index.
The results revealed that Red Carina significantly outperformed Giza-1 in plant height, stem diameter, grain weight per plant, grain yield, and harvest index, whereas no significant differences were observed between the two cultivars in panicle length or biological yield. The 20-cm plant spacing produced the highest mean grain yield (2.172 t ha⁻¹), biological yield (13.78 t ha⁻¹), and grain weight per plant (31.93 g). The Red Carina treatment at 20-cm spacing achieved the highest grain yield (2.837 t ha⁻¹) and biological yield (17.38 t ha⁻¹), whereas the highest harvest index (29.48%) was recorded for Red Carina planted at 10-cm spacing.
These findings highlight the importance of selecting suitable cultivars and plant spacing to improve quinoa productivity. Under the conditions of this study, Red Carina planted at 20-cm spacing appears to be the most promising treatment for grain production. Further trials across different growing seasons and locations, together with an assessment of economic feasibility, are recommended before formulating a general agronomic recommendation.
Key words: Quinoa; Chenopodium quinoa Willd.; cultivars; plant spacing; grain yield; biological yield; harvest index.
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How to cite this article – APA Style
Saada, I. A., Nemer, Y., & Al Jbawi, E. (2026). Response of two quinoa (Chenopodium quinoa Willd.) cultivars to different plant densities in terms of growth and productivity. Research Journal of Science, 4(1), 61–74.