关键词: 沙丘, 沙丘, 种子库, 种子萌发, 种群繁衍

Abstract: The paper aims to investigate the suitable planting density and sowing date of buckwheat. The author used local cultivar to explore the effect of different planting densities (B₁: 450000/hm²; B₂:750000/hm²; B₃: 1050000/hm²; B₄: 1350000/hm²) and sowing dates (A₁: in July 28; A₂: in August 7; A₃: in August 27) on the agronomic and yield traits of Fagopyrum esculentum Moench, and field trial was adopted by setting four planting densities and three sowing dates. The results showed that the seeding density had no significant effect on growth period, plant height, number of branches and the main stem node number. Among them, compared with sowing date of A₁ and A₂, A₃ was ten days longer; plant height was 9 cm and 12 cm shorter than that of A₁ and A_2. Meanwhile, the average node number reduced by 3.8 and 2.7 segments correspondingly, except number of branches, other indicators were significantly influenced by different sowing dates. There were significant effects of different planting densities and sowing dates on yield composition of Fagopyrum esculentum Moench, and the difference reached significant level among treatments. The treatment of A₁B₄ had the highest yield of 3997.55 kg/hm², increased by134.25% than that of A₂B₁ treatment which had the lowest yield. Treatments of A₁B₃, A₁B₄, A₂B₄ had higher yields of 3970.25 kg/hm², 3997.55 kg/hm² and 3970.20 kg/hm², respectively. So, the corresponding suitable sowing date is from the end of July to early August and the density of 1050000-1350000/hm² will be conductive to increase yield of Fagopyrum esculentum Moench.