磁粉包衣丸粒化蔬菜种子活力性能试验

为了满足磁吸式精密播种需要，提出了一种以滑石粉和细铁粉为填料的磁粉包衣剂。通过对白菜和甘蓝2种蔬菜种子的磁粉包衣丸粒化和磁化处理，试验研究了不同铁粉含量的磁粉剂在外磁场磁化作用下，对白菜、甘蓝种子发芽率、发芽势、活力指数的综合影响。试验结果表明：磁粉包衣丸粒化对种子早期萌发有抑制作用，但磁粉剂中铁粉质量分数控制在20%以内时，在磁场综合作用下，能明显提高种子后期的发芽率和活力指数，改善幼苗素质，促进幼苗根茎生长，根据试验得出的发芽率、发芽势、活力指数和幼苗素质，得到丸粒化用磁粉剂铁粉最佳质量分数：白菜种子为20%，甘蓝种子为10%，2种种子的磁化磁场强度为100 mT，研究结果为推动磁吸式精密播种技术的应用提供了试验依据。

Vitality property experiments of vegetable seeds coating with magnetic powder

To meet the needs of magnetic precision seeding, a magnetic powder coating made of talcum powder and iron powder was suggested. By the magnetic powder coating, cabbage seed and kohlrabi seed were magnetic granulate coated and magnetic treated. The experiment investigated that the combined influence, under the condition of external magnetic field, of different iron powder content in magnetic powder on the germination rate, the germination potential and the vital index of the cabbage seed and the kohlrabi seed. The experimentation indicated that coating with magnetic powder had inhibition for seed early germination, but if the iron powder was controlled in 30%, under the combined action of the magnetic field, the germinating rate and vital index were advanced, and the young seedling diathesis improved, meanwhile, the growth of seedling roots was promoted. Basing on the germinating rate, the germinating potential, the vital index and the young seedling diathesis from the experimentation, we can ensure that the optimum quantity of iron powder in magnetic powder for coating: cabbage seed was 20%, kohlrabi seed was 10%, both the intensity of magnetization magnetic field were 100 mT. The results provide a scientific basis for the promotion of the magnetic precise seeding technology.