How to identify and prevent corn nitrogen deficiency?

1.Choose disease-resistant varieties.

2.Plough the land and apply net fertilizer.

3.Timely removal of melanoma.

4.Spray pesticides.

Maize deficiency can be identified by looking at the size of the corn plant and the color of the leaves. Corn deficiency can be prevented by using nitrogen fertilizers.

Nitrogen mainly affects the photosynthesis of corn and is a constituent of organic matter such as vitamins and hormones in corn. Once there is a lack of nitrogen, the corn plant will be short and thin, the lower leaves show symptoms first, the lack of green turns yellow, and gradually develops upward, the leaves are thin and yellow, and the corn seedlings are pale yellow. However, it should be noted that high-nitrogen compound fertilizer is generally ammonium-based or urea-based compound fertilizer, which is easy to form biuret in the production process, and if it is too much fertilizer at one time, it is easy to cause seedling burning, so the application of high-nitrogen compound fertilizer should avoid the phenomenon of seedling burning.

The leaves are yellow, which is a nitrogen deficiency fertilizer. Foliar sprays can be done with urea water. Gradually expanded from the midrib to wedge-shaped, the middle of the leaf before the edge of the green to yellow-brown one by one died, although the middle leaf of the plant still remained green, it was no longer possible to ensure the absorption of N elements in the middle and late stages of maize, the male and female development was stunted, the heading period was delayed, and the serious yield reduction was a foregone conclusion.

For every 100 kilograms of maize kernels produced, the soil must provide kilograms of pure nitrogen. Because different nitrogen fertilizers have different nitrogen contents, different effective utilization rates, and different amounts of available nitrogen in the soil, the amount of nitrogen fertilizers provided to the soil varies greatly. It is mainly reflected in the blades.

In addition to the growth is not vigorous, the seedlings are not strong and the seedlings are uneven, the leaves are yellow from the middle part to the edge of the leaves, and they become withered, and the overall shape becomes "V" shaped dry or green except for the green in the leaves. This is a very obvious sign of nitrogen deficiency.

Sufficient nitrogen fertilizer can make crops strong, leafy, and green. The growth rate of crops will be accelerated, and on the contrary, it will lead to slow growth of crops, short plants, small and thin, and the obvious symptoms are that they first start to turn yellow from the tip of the leaf, and then extend from the leaf veins to the base in a wedge-shaped. Correction method: spring corn, to apply plantar fertilizer, nitrogen fertilizer in stages; If the summer corn has no time to apply base fertilizer, it is necessary to apply seedling fertilizer, jointing fertilizer and ear attack fertilizer in stages.

Foliar sprays are applied with a 2% urea solution, twice in a row over 3 to 5 days. Hope mine can help you.

I think that if there is a nitrogen deficiency in corn, it is likely to lead to a significant reduction in corn yield, or some other adverse reactions. When there is a lack of nitrogen in corn, we must supplement nitrogen to corn in a timely manner, we can use some high-quality nitrogen-rich fertilizers, fertilize it or spray the corresponding drugs, so that it can play a better role in a short period of time, and control the harm to a minimum.

It will turn yellow, it will not grow much, and it will not produce ears of corn; You should buy fertilizer directly and replant it in the roots of corn.

The growth and development period of rice is short, but the growth and development are fast and the production is largeHigh, the requirements for a large number of elements are also more, especially the demand for basal fertilizer is larger, in the bract rice trumpet stage to the tasseling stage, is the most abundant requirements for basal fertilizer, this stage should be the main top dressing basal fertilizer, the enhancement of corn yield will be of great help. The nutrient of the disease of Li Luchan nitrogen deficiency is a key nutrient that harms the plant photosynthesis of bracts, and is a component of vitamins, growth hormones and other organic substances in the body of bracts. Once deprived of nutrients, bud the plantIt will be short and weak, and the lower leaves will mainly show symptoms first, <>

Lack of green to yellow, gradually upward trend, the leaves are thin and yellow, first from the leaves along the leaf midrib to the bottom of the slowly yellow, the edge of the leaf is still green, more serious nitrogen deficiency, the plant will yellow and die. After the lack of nitrogen in the bud, if the fertilizer is too much, especially in the case of insufficient phosphorus and potassium fertilizer, the leaves of the bract will be dark green, vigorous, greedy for green, delay time perfect, and easy to fall seedlings, susceptible to diseases, especially if used too much at one time, it will continue to cause burn seedlings, so we must pay attention to effective fertilizer.

When using high-nitrogen compound fertilizer as base fertilizer, it should be separated from the seed by 3 5 cm; When used for topdressing, it is the seedling stage or the jointing stage to carry out ditching and ditching and filling soil in the bud rice rows and rows. If conditions permit, it is recommended that every time you apply fertilizer, you should apply excellent organic chemical water-soluble fertilizer at the root, such as root protection or Kangbao water-soluble fertilizer, to promote the rhizome to the depth of development with the active soil layer (especially in the land where agglomeration disease has occurred), and transport higher quality nutrients for the leaves. The principle of applying slow-release fertilizer is that the regularity of the nutrient release of chemical fertilizers should be the same as the regularity of the nutritional requirements of crops.

The release period is too long, the nutrients in the early stage of corn growth are insufficient, and the seedlings are poorIt affects the growth and development and production of the middle and late stages; The application period is too short, and the nutrients are released in the early growth period, which is easy to burn the seedling condition and aggravate the damage of basal fertilizer, and the nutrients in the later stage are insufficient, which will eventually harm the production. In general, the compound fertilizer containing slow-release fertilizer is generally used as a base fertilizer. Slow-release fertilizer or compound fertilizer containing slow-release fertilizer is higher than that of general fertilizer, so the economic benefits of fertilizer should be taken into account when using this fertilizer.

It may lead to a particularly small number of corn grains, and nitrogen fertilizer can be directly applied to the corn field, and the amount of land per mu is controlled at about 5 kg.

The first point of corn is likely to rot or die if this situation occurs, and the second point is likely to have a real estate situation, which is also very scary, and the first town tells that 3 points are to supplement the corn, so you should pay attention to the entire yield.

It will lead to slow growth of corn, thin plants, yellowing of leaf tips, and increased hollow grains; You can apply more organic fertilizer to corn to supplement the nitrogen needed.

Patches will also appear on diseased leaves, which will cause difficulties in corn heading, delayed heading, and poor ear development and bald tips. For plots with serious boron deficiency, kilograms of borax can be used as base fertilizer per mu. When symptoms of boron deficiency appear during growth, foliar sprays with borax solution are applied 2 to 3 times, with an interval of one week each time.

Borax fertilizer can also be applied to ditching, and kilograms of borax per mu are appropriate. Increase the application of farmhouse fertilizer in the deficient type, and rationally use nitrogen, phosphorus and potassium fertilizers. Strengthen field management and timely irrigation to prevent long-term drought.

Genetic factors: genetic factors are an important reason, many researchers agree with this reason, the development sequence of female florets, the differentiation interval of powder, etc. will affect the bald tip of corn, only when some varieties have a bald tip, it can generally be transformed or eliminated, and it is difficult for farmers to get in touch with the varieties that are born bald.

<> environmental factors. Environmental stress is a significant factor in the baldness of corn. Severe weather such as drought and high temperature will seriously affect the development of male and female ears of maize and the quality of pollen.

Necrotic spots appear between the veins of the upper leaf, which are white translucent stripes and are prone to rupture. The male spike cannot be withdrawn, and the male flowers cannot be formed or reduced. The ears are short, the grains are scarce, and the distribution is irregular, forming bald tips, which account for 1 3 of the entire ear.

Mineral nutritional reasons: sufficient nitrogen fertilizer is conducive to the plumpness of grains, lack of phosphorus, potassium and zinc, boron will lead to corn baldness, of which zinc and boron are the most critical, many farmers do not pay much attention to the supplement of trace elements, so the baldness caused by boron deficiency and zinc deficiency is particularly common.

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There may be malnutrition, the plant will be very small, the leaves will become thinner and thinner, the leaves on the top may appear transparent stripes, the ears are relatively small, the distribution of corn particles is very scarce, there is no regularity, there is a state dialect Jane may be deformed, it may cause a reduction in the round and auspicious yield.

The plant is dwarf, the young leaves are not complete, the new leaves are narrow and long, the edges of the old leaves or the tips of the leaves are green necrosis, the male flowers are degraded and atrophied, etc.

It can cause dwarf plants, can lead to stunted growth, can cause reduced yields, can lead to corn necrosis, and can lead to short ears.

1.The newly produced leaves become elongated and narrow, and it is difficult for young leaves to grow. Xiang slag 2

The leaves will be clustered. 3.There will be necrotic spots between the veins of the upper part of the leaf, which is white translucent stripes, and it is easy to break the state and crack quietly.

4.The male spike is not easily withdrawn, and the male flowers cannot be formed or will become smaller. 5.

Ears of corn are scarce and irregularly distributed.

When corn is boron deficient, the leaves of poorly buried plants are clustered. Necrotic spots appear between the leaf veins, which are white translucent stripes and are easy to break, and the male flowers cannot be formed or become smaller. The ears are short, curved, and deformed, and the grains are scarce and irregularly distributed.

It will cause the corn to not bear fruit, which means that the corn kernels are not full, because the corn is boron deficient and malnourished.

1. Nitrogen deficiency is often manifested as slow growth, short plants, thin and small leaves, and lack of green and yellow leaf color.

2. When crops are deficient in phosphorus, it is manifested as stunted growth and reduced yield. Excessive nitrogen and phosphorus will also cause late maturing and decreased seed setting rate.

3. The most common symptoms of potassium deficiency in plants are burns along the leaf margins, which first start from the old leaf mold in the lower part and gradually expand to the upper leaves, and there are spots. Potassium-deficient plants grow slowly and have poor root development. The stems are fragile and often lodging.

The seeds and fruits are small and wrinkled. The plant is less resistant to diseases. It has obvious lodging resistance, which can increase the taste of fruits and vegetable crops.

Symptoms: When corn is boron deficient, the new leaves of the plant are long and narrow, the young leaves are difficult, and the leaves are clustered. Necrotic spots appear between the veins of the upper leaves, which are white translucent stripes and are easily broken.

The tassel is not easily withdrawn, and the male flowers cannot form or become smaller. The ears are short and deformed, the particles are sparse and irregularly distributed, and they account for 1 3 of the entire ear.

Symptoms: When corn is boron deficient, the new leaves of the plant are long and narrow, the young leaves are difficult, and the leaves are clustered. Necrotic spots appear between the veins of the upper leaves, which are white and translucent stripes, and are easy to rupture.

The male spike is not easily withdrawn, and the male flowers cannot be formed or become smaller. The ears are short and deformed, the grains are scarce and irregularly distributed, and the formation accounts for the entire ear1 3.

In the early stage of maize, boron deficiency made it difficult for seedlings, the leaf tissue was destroyed, the leaf veins showed wide white stripes, and the roots became thicker and brittle. Boron deficiency at the flowering stage, the male panicle is not easy to be extracted, the male flower is degraded, the female panicle cannot develop normally, and even forms empty stalks; The ears and seeds are unevenly bent, the seed setting rate is low, and the top of the ear turns black.

There will be dwarf plants, new leaves are narrow and long, white and dry, and transparent stripes appear between the veins of the upper leaves, which will lead to poor growth and development, and when mature, the corn will become short and small, with few grains and irregular distribution.

A large number of yields are reduced, flowers and fruits are dropped, the corn cob is very small, and it is deformed, it is difficult to form flowers, no ears, and the normal corn kernels cannot grow at all, and the leaves are brown.

Corn leaves are yellow, corn tips are curled, corn cobs are thin, or corn kernels are unevenly distributed, or there are no ears, and there is no yield.

There will be symptoms of yellowing of leaves, symptoms of leaf wilting, symptoms of black corn, symptoms of corn wilting, and symptoms of moldy leaves.