栽培学上以玉米完熟期收获好，但生产上不易掌握，利用玉米子粒“黑层”出现来判断最佳收获期，方法简单，便于应用。玉米授粉后，随着子粒内淀粉含量的逐渐增加，在子粒顶部首先沉积成固体淀粉层，在固、乳交界面处就会形成一条乳线。随着干物质增加，乳线逐渐下移，最后... Cultivation of maize maturity harvest, but the production is not easy to grasp, the use of corn particles “black” appear to determine the best harvest, the method is simple and easy to apply. After pollination of corn, with the increase of starch content in the grain, the top of the grain is firstly deposited into a solid starch layer, and a milk line is formed at the interface between the solid and the milk. With the increase of dry matter, milk line gradually down, and finally ...