When is the best topdressing time for corn?
Some netizens asked: When should nitrogen fertilizer and urea be topdressing corn, and what topdressing method is the most suitable?
Although the growth cycle of maize is not long, it is a high-yield crop and needs a lot of nutrients to support its development and growth.
According to the growth characteristics of corn, it has the greatest demand for nitrogen fertilizer, and it is impossible to meet its required nutrients by planting chemical fertilizers alone. So in theory, topdressing is necessary.
Generally, in the process of maize planting management, if topdressing is carried out according to the growth stage of maize, it may be necessary to carry out topdressing for four times.
① Topdressing at seedling stage
Topdressing at seedling stage is to make corn seedlings strong and develop roots, and ensure better and faster growth of corn seedlings.
② Topdressing at jointing stage
When maize seedling enters jointing stage, it needs certain nutrition to support its thick stems and leaves and jointing growth.
② Top dressing at big bell mouth stage
When the corn grows to 12 or 13 leaves, it looks like a big horn from top to bottom. This period is the "big and small period".
From this stage to heading stage, it is the period with the largest fertilizer requirement for corn, which is called "heading stage". Fertilization can promote male flower differentiation and increase yield, which is the key period of maize growth.
④ Top dressing at grain filling stage.
After the ear stage, the corn is about to mature, so more nutrients are needed to help the corn fill and mature, increase the grain weight, and thus increase the yield.
Theoretically, these four stages of maize need topdressing nitrogen fertilizer. In China, growers usually use the method of "one-time topdressing", that is, topdressing once at the big bell mouth stage.
Mainly considering the cost problems such as time and energy, giving is not proportional to getting. If the number of topdressing is more, it is better not to plant, which reduces the enthusiasm of labor.
When topdressing, it is best to apply fertilizer in holes, sprinkle fertilizer in dug holes and cover it with soil for compaction, which can reduce the volatilization of fertilizer efficiency and ensure the effective utilization of fertilizer.
In the process of maize growth, reasonable fertilization can promote maize growth and increase maize yield. Top dressing should be carried out according to the specific growth of corn, and fertilizer and water management should be carried out at the same time, so as to achieve high yield!