关键词: 城市污泥, 城市污泥, 高温堆肥, 重金属形态, 种子发芽指数

Abstract: Based on the actual production problem that the sowing date of common bean is always delayed due to frequent low temperature and drought in spring in its main planting areas of Heilongjiang Province, this study aims to select coordinated cultivation technology of sowing date and planting density for common bean. A field experiment was conducted with 3 sowing dates (May 15, May 25 and June 04, denoted as I, II and III) and 4 planting densities (15×104 plant/hm2, 20×104 plant/hm2, 25×104 plant/hm2 and 30×104 plant/hm2, denoted as D1, D2, D3 and D4), to investigate the effects of sowing date and planting density on agronomic characters, dry accumulation and yield of common bean. Results showed that compared with sowing date I (May 15), plant height, stem diameter, node number and branch number on main stem decreased, but growth rate increased under sowing date II (May 25) and III (June 04). Moreover, with the delay of sowing date, post-anthesis dry matter accumulation in single plant and population of common bean decreased gradually, pods per plant, seeds per plant and weight of 100 seeds in common bean first increased and then decreased. For the seed yield per hectare, II-D2 was the highest, followed by I-D2 and III-D3, and they were 27.18%-45.31%, 17.57%- 34.34%, 14.92%-31.31% higher than D1 treatment under different sowing dates, respectively. Overall, under the three different sowing dates, reasonable planting density resulted in higher growth rate and post-anthesis dry matter accumulation and excellent canopy structure in common bean population. It was more obvious in increasing and stabilizing seed yield with late sowing date (III) and moderate high planting density (D3).