Abstract
In addition to environmental conditions and cultural practices, plant factors, particularly morphological parts, have a significant effect on the yield and feed value of roughages. However, no studies have been conducted for this purpose on quinoa grown for hay production. Therefore, between 2017 and 2018, a study was planned to determine the effect of different sowing times (mid- March, late March, early April, and mid-April) and plant parts (leaves, stems and panicles) together on the herbage yield and quality characteristics of quinoa. In the experiment established according to a randomized complete blocks design, a significant decrease in plant height, stem thickness, number of branches, and panicle ratios were determined with delayed sowing time. The highest contribution of the stems to the fresh herbage and dry matter yield was determined in the 1st sowing period, but the highest contribution to the neutral detergent fiber, acid detergent fiber and acid detergent lignin contents were determined in the first 2 sowing periods. The highest crude protein ratio and yield were determined in the leaves in the late and 1st sowing period, respectively. The highest digestible dry matter and metabolic energy contents were measured in the leaves in all of the sowing periods. The highest digestible energy and relative feed values were determined in the leaves of plants sown in the last 2 sowing periods. As a result, it was shown that the leaves had a positive contribution to the feed quality of quinoa, while the stems had a positive contribution to the feed yield. In addition, it was concluded that sowing should be performed without delay for high yield and at a later time for quality hay production. Key words:
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