Effect of Harvest Time on the Seed Yield and Quality of Kengyilia melanthera

Kengyilia melanthera is one of the most important forages, and has received significant attention as a desirable ecological pioneer grass for conserving grasslands mitigating degradation pressure in region. It widely distributed alpine sandy meadow zone Eastern Qinghai–Tibet Plateau (QTP). Therefore, determining optimal harvest time this species critical. A two-year field experiment (2016–2017) was utilized study to evaluate impact eight times on seed yield quality K. ‘Aba’. The results show that fresh weight (FW), dry (DW), (SY), thousand-grain (TGW), accelerated aging germination percentage (AAGP), dehydrogenase activity (DA) seeds increased with extension two trial years, while water content (WC) decreased. In both (GEP), potential (GP), acid phosphatase (APA) initially then decreased time. comprehensive evaluation membership function hierarchical clustering revealed 30th day after peak anthesis 2016 2017. During time, FW, DW, SY, TGW, AAGP, DA, WC, GEP, GP, APA reached their value, 0.815 g, 0.518 1773.67 kg·hm−2, 143.81%, 66%, 16.23 µg·mL−1, 36.01%, 87%, 85%, 2.50 nmol·min−1 0.805 0.515 1847.42 133.96%, 65%, 16.52 36.04%, 86.5%, 83.5%, 2.55 2017, respectively. This uncovers several high-efficiency long-term technological solutions cultivating high yields production East QTP.