When does the corn apply nitrogen fertilizer? How much is it per mu? What are the fertilization techniques?

Corn alias maize, stick, Bao Gu, Baomi, Baomi, Zizania latifolia, bract rice, pearl rice, bract lotus, big Reed millet, northeast Liaoning is called pearl grain. It is the crop with the highest total yield in the world. Do you know when it will apply nitrogen fertilizer? How much does it take to apply per mu? What are the fertilization techniques? Let's take a look at it with the editor.

When does the corn apply nitrogen fertilizer?

The main results are as follows: 1. in the main stage of vegetative growth, the general early-maturing varieties spread out at 5-6 leaves, the mid-maturing varieties expanded at 7 leaves, and the male ear growth cone began to elongate, which is the best fertilizer application period for maize, and the amount of fertilizer application accounts for about 30% of the total fertilization. At this time, adequate fertilizer and water is the key to promote the early growth and stable growth of strong seedlings and build a good shelf for high yield. ) applying nitrogen fertilizer 2Compact 10.

2. At the stage of vegetative growth and reproductive growth, the 11th leaf of maize unfolds, the plant has formed about 60%, and the male ear has begun to differentiate into florets, which is the key period for the formation of grain number per ear.

3. After pollination, the stalk basically stopped growing and entered the stage of reproductive growth. At this time, for the maize with insufficient fertilizer supply or de-fertilizing phenomenon after heading, one-time tapping fertilizer should be applied, and the fast-growing and late-maturing varieties should be applied.

How much corn is used per mu?

Fertilizer application rate = (requirement of planned yield to a certain factor-soil supply to a certain factor) / (content of an element in fertilizer (%) × fertilizer utilization rate (%).

The utilization rate of fertilizer varies greatly. According to the experiment, the utilization rate of organic farm manure is about 30%, that of nitrogen fertilizer is about 40%, that of nitrogen fertilizer is about 40%, and that of phosphorus and potassium fertilizer is about 30%, 40%, 40%. In other words, the amount of nitrogen fertilizer (urea) is 32.16 (kg / mu).

What are the fertilization techniques for corn?

1. Prevent premature senility. If there is a rainy area, we should do a good job of drainage and waterlogging prevention, and if there is a trend of premature senescence or leaf yellowing, we should topdressing or spraying phosphate fertilizer at the early stage of flowering to prolong green leaves, increase fruit ears, and apply more plant ash or potassium sulfate fertilizer at seedling stage to prevent premature senescence.

2. Air defense culm. Insufficient supply of minerals, nutritional disorders, can not meet the requirements of nutrients during ear differentiation, or too high density, weak photosynthesis, and more nitrogen fertilizer, less phosphorus, lack of potassium will cause empty stalk. Attention should be paid to the density when planting, requiring that the rows of maize should not be closed, in order to ensure ventilation and ventilation, to supply nutrients and water timely and appropriately, to facilitate ear differentiation and development, and to pay attention to the proper combination of nitrogen, phosphorus and potassium when applying fertilizer.

3. Prevent grain deficiency and baldness. In order to prevent premature senescence of plants, the key is to prevent diseases and insect pests, apply more phosphate fertilizer and potash fertilizer, such as drought during silk drawing, timely watering and irrigation, and artificial pollination is best during flowering.

4. Prevent lodging. Excessive seedling density and improper management of fertilizer and water during stem elongation will easily lead to lodging and affect the yield. When planting, it is necessary to deepen the ploughing layer, increase the application of base fertilizer, and cultivate the soil properly when ploughing, so that the corn can take root. When fertilizing, we should pay attention to the combination of nitrogen, phosphorus and potassium, and pay attention to the plant density to ensure that the leaves have enough sunshine during the growing period, make the plants stout and plant seedlings sturdy, so as to increase the lodging resistance.