1. Seedling stage 1. Sowing: If a live seed is buried in the soil, if the temperature and humidity are suitable, seedlings will grow in about 6 days. At the three-leaf stage, the nutrition in the seeds will be exhausted, which is the weaning stage, that is, the first stage of corn.

2. jointing stage: the three-leaf stage is the first turning point of corn, which will change from autotrophic to heterotrophic. This stage is mainly the flowering of roots, leaves and stems. During this period, drought and waterlogging tolerance will lead to seedling death, and mild drought is beneficial to root development.

Second, the heading stage refers to the jointing to heading stage, which is the second turning point of corn. At this stage, its nutrition and reproduction are carried out at the same time, which is the most vigorous stage of growth and development and the most important period of management. It is best to carry out topdressing to supplement enough nutrients and promote the increase of leaves and stems, so as to achieve the purpose of large panicles and multiple panicles.

Third, the stage from flowering to maturity is called flowering period. At this point, all the leaves have spread out and the length of the plant has been fixed. It is also the third turning point in its reproductive growth stage. During this period, it is necessary to protect the leaves from premature aging and damage, strive for more and heavier grains, and achieve high yield.