An evaluation of smallholder seed threshing and cleaning technologies in seed production of Cleistogenes songorica cv. ‘Tenggeli’

doi:10.11686/cyxb2018135

Abstract

Abstract: Cleistogenes songorica ‘Tenggeli’ is a new “wild” grass cultivar registered by the Chinese Herbage Variety Registration Board in 2016 (Registration No: 499), which has excellent drought tolerance and soil stabilization capacity, and so plays an important role in ecological regeneration, landscaping, and grassland restoration in arid and semiarid areas. However, there is an urgent need to accelerate seed multiplication and to develop feasible seed threshing and cleaning techniques. Based on a preliminary trial we conducted at an experimental station in Yuzhong County, Gansu Province, further research was carried out in Minqin County in the Hexi Corridor, Gansu Province, to evaluate the suitability of the seed threshing and cleaning techniques developed, for use by smallholder farmers. For naturally dried seed-heads, 45-55 passes under a 50 kg roller resulted in the highest harvest rate (up to 78% of total seed present), without loss of seed quality. The optimum airflow velocity for seed cleaning was 4.5 m·s^-1, and seed purity attained with this airflow velocity and two passes over a sieve, was up to 86%. These data are of great importance for C. songorica ‘Tenggeli’ seed production, as improved seed availability will enhance the extension process and the user adoption of this important new cultivar.

Key words: Cleistogenes songorica ‘Tenggeli’, seed threshing, seed cleaning, harvest rate, seed quality

TAO Qi-bo, JIA Cun-zhi, WANG Yan-rong, LI Xin-yong, HAN Yun-hua, BAI Meng-jie. An evaluation of smallholder seed threshing and cleaning technologies in seed production of Cleistogenes songorica cv. ‘Tenggeli’[J]. Acta Prataculturae Sinica, 2019, 28(2): 51-60.

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