Abstract:

To explore the effects of seed-coating agents on seedling growth, some enzyme activities and contents of nitrogen (N), phosphorus(P), potassium(K) and boron(B) of rape under the conditions of no-tillage and direct-seeding, experiments were conducted by using no-tillage and direct-seeding cultivation with hybrid and conventional rape seeds coated with seed pelleting agent WHY-11 and seed filming agent YCY-11, respectively. Results showed that the prevention rates to main diseases and insect pests during seedlings of coating treatment rapes with WHY-11 and WHY-11 increased by 32.73%-79.44% and 10.91%-70.61%, compared with uncoated controls, respectively. The cauline basilar width increased by 7.96%-11.54% and 3.45%-6.90%; The leaf area increased by 4.21%-38.31% and 20.56%-21.08%; The fresh weight increased by 11.84%-46.86% and18.80%-25.83%; The rate of high hypocotylar seedling decreased by 5.66%-10.23% and 15.11%-18.90%; The contents of N, P, K and B increased by 7.44%-19.22% and 0.95%-5.52%, 2.0%-2.8% and 18.74%-38.83%，3.57%-4.49% and 2.85%-4.30%, 7.82%-9.07% and 9.05%-10.72%, respectively; The activities of peroxidase (POD), catalase (CAT) and superoxide dismutase (SOD) increased by 17.64%-44.56% and 27.61%-33.05%， 85.54%-86.46% and 19.62%-66.56%, 8.46%-19.35% and 14.99%-27.73%, respectively. Those results showed that two seed-coating agents not only could promote seedling growth, increase seedling resistance to adverse environments, but also could enhance seedling qualities of no-tillage and direct- seeding rapes. These effects, however, were different on hybrid and conventional rapes. The general effects of seed pelleting agent were better than those of seed filming agent.