How to distinguish corn leaves? How to distinguish the leaf stage of corn?

Counting the number of leaves. Corn leaves are grown on the stem nodes, how many internodes of a variety will have how many leaves, generally more than 15-24 leaves, of which early maturity is generally 15-17 leaves, medium maturity 18-20 leaves, and late maturity more than 20 leaves. Corn is a monocot crop, the number of rice leaves is generally more than 18, the number of corn leaves is relatively stable for each variety, this is because corn grows regularly in the seedling stage, and slowly begins to differentiate and form.

According to the botanical genetic definition, so the number of corn leaves is relatively stable.

According to the growth characteristics of corn leaves: generally spring-sown corn has 20-21 leaves in the whole growth period, and summer-sown corn has 17-18 leaves in the whole growth period. It is called a leaf ear or leaf collar, when the leaf ear or leaf collar of corn appears or is fully opened, the leaf is called a complete leaf, and if the leaf ear of the 7th leaf of corn appears or, it is called the 7-leaf stage of corn at this time.

When the leaves of the corn are all opened, it enters the reproductive growth stage.

In the case of dry soil, control the timing and amount of watering. The purpose is to let the root system take root and stretch the root system as much as possible in the case of water shortage in the upper layer of the soil: on the one hand, the purpose of extending the root system is achieved; On the other hand, it thickens the root system.

Able to absorb more nutrients at a later stage. At the same time, the compacted soil is loosened, the water in the soil is no longer transported, and it continues to be stored at the root position of the corn seedlings, so as to ensure the rapid growth of the corn roots, achieve the purpose of deep rooting, and then consider the capillary root to be widespread.

Summer maize seedling period is short, fast development, field management is often out of time, not suitable for squatting seedlings. The corn seedlings interplanted in the wheat field, because of their weak seedlings, enter the jointing stage soon after harvesting the wheat, should be managed as soon as possible, watered with "life-saving water", and applied seedling fertilizer to promote the growth of the seedlings, so that they can quickly turn strong before jointing. By squatting seedlings, the root system can be promoted, and its downward growth can be guided, so that it can be deeply rooted and aerial roots can be promoted.

growth, improve the lodging resistance at the seedling stage, increase the ability of the root system to absorb nutrients and water, so that the corn seedlings meet the standards of high-yield seedlings, and then can improve the yield.

The surface of 1 5 leaves of corn is not fluffy, the 6th leaf begins to have sprout fluff on the surface, which is more astringent to the touch, and the leaves of corn often have leaves, leaf ears and leaf sheaths, and its leaves are alternate, and there is a leaf on each node.

The leaves should be counted from top to bottom, and a few leaves are the leaf stage, which is very differentiated, which is also a common method used by farmers.

You can start counting from the top of the corn, so you can know how many there are, in fact, it can also be determined by the growth status of the corn.

Generally, check the leaves of corn before 10 leaves, and there are several leaves that are several leaf stages. In the life of maize, the date when the plant morphology and structure change significantly due to the change of internal and external conditions is called the growth period. The life cycle of corn is divided into seven periods, and the specific names and standards are as follows:

Sowing period: i.e. the sowing date. Emergence:

Seedlings are about 2 cm tall on date. Jointing stage: The date on which the internodes at the base of the stem begin to elongate.

Male tasseling stage: 3-5 cm date exposed at the top of the main shaft of the male panicle. Flowering period:

The date of flowering of the male panicle spindle. Silk spinning stage: the date when the female spike filaments protrude from the bracts l a 2 cm long.

Maturity stage: The leaves of the female bracts turn yellow and loose, the seeds show the inherent shape and color of the variety, and the date when a black layer forms at the sharp crown below the embryo. <>

In the early growth stage of corn, the number of leaves can be distinguished according to the number of leaves, that is, if the corn has 5 leaves, it is the 5-leaf stage. In the later stage of corn growth, it is necessary to use the "five-light and six-hairy method" to determine the leaf stage of corn, that is, before the 5-leaf stage, there is generally no hairiness on the leaves, and at the 6-leaf stage, there will be hairs on the leaves, so you can touch the leaves from the bottom to the top, and the hairy leaves are the 6th leaves, and then count upwards to determine the leaf stage of corn. <>

In the early stage of corn growth, because the number of leaves is relatively complete, it can be distinguished according to the number of leaves, for example, if there are 5 leaves, it is the 5-leaf stage. In the later stage of corn growth, the lower leaves begin to senescence and fall off, if the number of leaves is directly observed, it is not good to determine how many leaves the corn is in, so the "five light and six hairs method" can usually be used to determine the leaf stage of corn. <>

Usually when the corn is less than 5 leaves (including 5 leaves), the leaves of the corn are relatively smooth and there are no hairs, but when the corn enters the 6 leaf stage, the corn leaves will begin to grow hairy, so you can start to touch the leaves from the bottom to the top, if which leaf has hairs, it is the 6th leaf, and then count up, you can judge that the corn is in the leaf stage, which is the "five light and six hairy method". The above is a display of relevant literature and is for reference only.

It can be distinguished according to how many leaves the corn has, and this way of distinguishing is relatively simple, as long as you count some mature leaves.

It can be seen that the corn has a few leaves stretched and stretched, indicating that the corn is in the stage of several leaves, which is very easy to judge.

There are seven periods of corn in total. The seedlings are about two centimeters tall and are in the emerging stage. Further growth begins to be the jointing stage, and the stamens are exposed 3 to 5 cm for the extraction stage.

The main axis flowering is the flowering period. The filaments protrude from the bracts 1 to 2 cm for toast. Finally, the fruit is ripe.

Looking at the leaf size of the corn and the growth situation, it can be determined that the corn has several leaf stages, but 13 to 19 leaves indicates the heading stage.

Counting of corn leaves: Count the leaves from the bottom to the top, the corn is 6 leaves and one heart, and the bottom visible leaf is counted as one leaf. Some people may say that this is 5 leaves in one heart, combined with the experience of "five lights and six hairs", check whether the 6th leaf has hairs, if there are hairs, it means that the bottom leaf should be counted as the total number of leaves.

Conversely, if the 6th leaf is not hairy, the bottom leaf does not count as the total number of leaves. In practice, the fact that the 6th leaf can be hairy proves that the former is correct.

Precautions for corn planting:

1. The sowing depth should be appropriate. Regardless of machine sowing and hand point, the sowing depth of corn is required to be 3 5 cm, and if you plan to water the head water, you can sow 3 cm deep. Sowing too deep will cause slow seedling emergence, weak seedlings, if watering too much, there will be poor seedling emergence, resulting in lack of seedlings.

2. Apply seed fertilizer correctly. Sowing an appropriate amount of phosphorus and potassium fertilizer as seed fertilizer can significantly enhance the growth of seedlings and increase the yield.

3. Pour water on the head in time. After sowing, it is necessary to water the head in time. If the amount of fertilizer is too large and not watered in time, it is easy to cause chemical fertilizer burning.

4. The sowing amount should be uniform and consistent. Before sowing, after the seeds are poured into the seeder, the seed wheel should be rotated to see if the amount of seeds in each row is consistent.

Corn grown in the high temperature season is not only susceptible to pests and diseases, but also to a variety of natural disasters. Pest infestations and natural disasters vary from time to time. Only according to the characteristics of corn growth and development, good management in each period can ensure the high yield of corn.

The maize 3 5 leaf stage is the first critical period for maize seedling management. How to manage the high yield of corn in Baoling mu? After the emergence of corn and before the three leaves, the corn seedlings mainly rely on the nutrients in the seeds to root and grow leaves, with few roots, small leaves, small growth and poor stress resistance.

When the corn seedlings grow to 3 to 5 leaves, the corn seedlings are transformed from autotrophic to heterotrophic, the root system can absorb water, fertilizer and nutrients from the soil, and the leaves also begin to photosynthesize. Roots, stems, and leaves grow at the same time, and the resistance gradually increases. Therefore, the management of maize3 5 leaves is the key to cultivating strong seedlings.

We must pay attention to the following points. 1.Pay attention to insect protection.

As the saying goes, drought is the most drought-prone period for corn seedlings, and this is the outbreak period for many pests. Among them, thrips, armyworms, beet armyworms, aphids, gray planthoppers and other pests are the most common and the most harmful. In the conditions of high temperature and drought, it is very conducive to the occurrence and reproduction of these pests.

Once it is not controlled in time, it can break out. Due to the small size of corn seedlings, it is easy to cause serious damage. Resulting in lack of seedlings and broken ridges.

Therefore, the 3 5 leaf stage of corn is the best period to control corn pests. You can use 40% chlorfenapyr thiamethoxam dispersible granules 8 12 g mu, or 13% emamectin desamectin behenzoate saline dispersible granules 10 g, or you can use emamectin benzoate emulsion 5 6 ml, any of the three formulas, and add 20 30 kg of water. 2.

Spraying herbicide corn 3 5 leaf stage, weeds in the field are basically complete, grass is young, poor pesticide resistance, corn is the strongest ability to remove herbicides, corn is not easy to occur pesticide damage, is the best period for spraying herbicides after corn field seedlings. For ordinary corn, you can use 100 120 ml of 30% nitazine atrazine dispersible oil suspension, add 20 kg of water, and spray evenly. Because this formula has the dual effect of blocking, all unearthed herbicides can be sprayed.

For special corn, such as sticky corn, sweet corn, popcorn, etc. % zooxone dispersible oil suspension 150 200ml, add 20 kg of water, can be evenly sprayed, and have a good killing effect on common annual grasses and broad-leaved weeds in the field. Create favorable conditions for the normal growth and development of corn seedlings. 3.

Do a good job in water control. 3 The 5-leaf stage is the key period for the synchronous growth of corn roots and leaves. In June, there is high temperature and little rain, which is prone to drought, which is very unfavorable to the growth of corn seedlings.

Proper drought is beneficial to the growth of seedling roots, but excessive drought will affect the growth of maize seedlings. When the drought is severe, the seedlings may die due to drought, resulting in lack of seedlings and broken ridges. Therefore, once there is no rain for a long time and a serious drought occurs in the field, it is necessary to water the corn seedlings in time to ensure their normal growth and lay a good foundation for cultivating strong seedlings.

Corn 3 to 5 leaves refer to the third and fifth leaves of corn and usually appear about 30 days after corn is planted. During the growth of maize, the third and fifth leaves are important growth stages of maize plants, which have an important impact on the health insight and yield of maize. Therefore, growers need to pay attention to the growth of corn plants at this stage, and carry out timely maintenance and management and collapsing.

Corn leaves mainly depend on the number of leaves to decide, in the growth process of corn, a total of 7 stages, namely sowing period, seedling stage, jointing stage, tasseling period, flowering period, silking stage, maturity period, etc., in the corn grow 3-4 leaves time seedlings, 3-5 leaves spray herbicides, 6-10 leaves begin to control the vigor, 9-11 leaves for top dressing.

In the growth process of corn, it is divided into 7 stages, namely sowing period, seedling emergence stage, jointing stage, tasseling period, flowering period, silking stage, maturity period, etc.

Corn leaves are generally composed of three parts: leaves, leaf ears and leaf sheaths, the leaves are alternate, each node has 1 leaf, corn leaves are the most important organ for the plant to photosynthesize organic matter, and it is also the most vigorous part of transpiration, and can also transport nutrients.

The best time to spray herbicides on corn is 3-5 leaves, the time to spray the growth control agent is 6-10 leaves, and the topdressing period is 9-11 leaves.

In the process of breeding corn, we should be diligent in weeding, especially in the seedling stage, we should weed once a month to avoid consuming nutrients, and we should often clean up dead leaves, yellow leaves, etc., strengthen the ventilation of the lower part of the plant, so that corn can grow robustly.

13 19 leaves, corn heading period refers to the jointing of the male during this period, is the corn stem and leaf growth is more vigorous, male and female begin to differentiate, vegetative growth and reproductive growth go hand in hand, the largest water consumption, the most fertilizer demand, pests and diseases are frequent, the chain shouts to guess the effective number of ears and grains, plant growth and development is good or bad, has an important impact on corn yield.

The water consumption of maize is the largest at the ear stage, accounting for 30 35 of the total water consumption in a lifetime, and the water consumption intensity is the largest at the tasseling stage, which is the critical period of maize water demand, drought and water shortage will cause different degrees of yield reduction, or even no harvest, which seriously affects the yield.

Where there are irrigation conditions, corn earing to milk maturity stage requires more water, irrigation at this time, infiltration can not only improve the seed setting rate, but also promote the operation of nutrients, ensure that the grain is full, and improve the yield.

The 5th leaf of corn below (including the 5th leaf) is smooth, and when it grows to the 6th leaf, the leaves begin to be hairy, so to distinguish the number of leaves, you only need to touch it with your hand, and the first leaf is hairy, that is, the 6th leaf, and then count it up. Corn has a total of 13 19 leaves, and the heading stage of corn is from jointing to tasseling. <

The 5th leaf of corn below (including the 5th leaf) is smooth, and when it grows to the 6th leaf, the leaves begin to be hairy, so to distinguish the number of leaves, you only need to touch it with your hand, and the first leaf is hairy, that is, the 6th leaf, and then count it up. Corn has a total of 13 19 leaves, and the heading stage of corn is from jointing to tasseling. This is the period when stems and leaves grow vigorously, male and female differentiation is vigorous, nutrient growth and reproductive growth are vigorous, water consumption is greatest, fertilizer demand is greatest, and pests and diseases are frequent.

It can determine the number of effective grains per panicle, and the growth and development of plants has an important impact on corn yield.