How to check corn leaves? How to look at corn seedlings 3 5 leaves

Correct counting of corn leaves.

As corn grows, new leaves are being extracted, and experienced growers often judge whether they should fertilize the corn based on the number of leaves.

The leaves of corn often have three parts: leaves, leaf ears and leaf sheaths, its leaves are alternate, and there is a leaf on each node, and the leaf is the main organ for its photosynthesis, and it is also the main organ for corn transpiration. But many people don't know exactly how many leaves corn has. In fact, corn generally has 13 19 leaves, and the reason why there is a big difference in trees is because it is calculated differently.

If we look closely at corn, we can find that the surface of 1 5 leaves of corn is not fluffy, and from the 6th leaf onwards, there are hairy hairs on the surface, which is more astringent to the touch. This is also what we often call the glossy.

It is very important to learn to count the leaves of corn during the planting process, so that we can reasonably judge its growth stage and fertilize it. Normally, corn generally has 13 19 leaves, and the reason why there is an error of 3 6 leaves is because its leaves are divided into leaves and visible leaves, and different regions have different calculation methods for corn leaves, so the results are also different.

Corn is an annual herbaceous plant in the family Poaceae. It is also known as bud valley, bud rice stick, maize, pearl rice, etc. Corn is native to Central and South America and is an important food crop in the world.

Compared with traditional rice, wheat and other food crops, corn has strong drought tolerance, cold tolerance, barrenness tolerance and environmental adaptability.

As a high-yield grain crop in China, corn is an important feed for animal husbandry, aquaculture, aquaculture, etc., and is also one of the indispensable raw materials for food and chemical industries.

The leaves of corn often have three parts: leaves, leaf ears and leaf sheaths, and its leaves are alternate, with a leaf growing on each node, and the leaves are alternate, and each node has 1 leaf. The leaf tongue is a colorless film that adheres to the stem at the junction of the leaf and the leaf sheath, and has the effect of preventing dust, rain and organisms from invading the stem. The main function of corn leaves is to carry out photosynthesis and transpiration, and also has a certain absorption function.

At the same time, it is also the main organ for transpiration of corn.

Corn will continue to pull out new leaves as it grows, and it is very important to learn to count the leaves during the planting process.

Corn generally has 13 19 leaves, and the reason why there is an error of 3 6 leaves is because its leaves are divided into leaves and visible leaves, and different regions have different calculation methods for corn leaves, so the results are also different.

Under normal circumstances, corn is smooth to the touch below the 5th leaf (including the 5th leaf). When the sixth leaf grows, the leaf will be hairy. Therefore, to tell the number of leaves of corn, you only need to touch it with your hands.

The first leaf is hairy, that is, the sixth leaf, and then count it upwards.

1. The lower part of the leaf appears the leaf collar (leaf lug), complete, and the leaf is a complete leaf. In the early stage of corn growth, the number of leaves is relatively complete, and the leaf age of corn can be judged according to the number of leaves.

2. In the late stage of growth, the lower leaves are senescent and fall off, and the number of leaves can not be determined by direct observation, and the "five-light and six-hairy method" is used (during the growth of corn, from the real leaf to the fifth leaf, the leaf surface is smooth and hairy, and from the sixth leaf, a large number of hairs appear on the surface of the leaf, and there is a feeling of astringency and prickly hand when touched) to determine the age of corn leaves.

3, seedlings: 3-4 leaves; Post-emergence herbicides: 3-5 leaves; Dwarfing agent: 6-10 leaves; Top dressing: 9-11 leaves.

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.

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.

Corn has the least 8 leaves and the most 48.

As far as the corn varieties we currently cultivate are concerned, the average early-maturing variety is 14 16 pieces, the medium-maturing variety is 18 19 pieces, and the late-maturing variety is 20 21 pieces. The number of leaves of the same corn variety is relatively stable, and the difference between spring-sown corn and summer-sown corn is only about 1.

Composition of the blades:

Corn leaves are composed of three parts: leaf sheath, leaf and leaf tongue, with a large main vein in the middle, and the rest of the leaf veins are distributed in parallel. The leaf surface is tiled, and the edges are often wavy. These characteristics of maize leaves are the result of long-term natural selection, which can help collect rainwater to the roots, enhance drought resistance, and protect against wind damage.

Corn leaves are generally composed of three parts: leaves, leaf ears and leaf sheaths, the leaves are alternate, and each section has one leaf, corn leaves are the most important organ for corn to photosynthesize organic matter, and it is also the organ with the most vigorous transpiration, and it is also the main organ for nutrient transportation; The leaf tongue is a colorless film that adheres to the stem at the junction of the leaf and the leaf sheath, and has the effect of preventing dust, rain and organisms from invading the stem. The leaf sheath is more tough and developed, tightly encapsulated and has the effect of protecting the stem, supporting the leaf and enhancing the resistance to breakage, as well as storing nutrients. What are corn leaves and visible leaf heart leaves: refers to the leaves that have just grown from the point of growth of corn and have not yet been made, which is called heart leaves.

Leaf: A complete corn leaf is composed of three parts: leaf sheath, leaf blade, and leaf tongue. When the leaf or collar of corn appears or is fully opened, the leaf is called a complete leaf.

Visible leaves: Corn visible leaves are leaves that have grown and can be seen from corn leaves. Generally, we call about half of the corn leaves visible leaves, and the visible leaves include leaves and unseen leaves.

How to determine the number of corn leaves In production, the best time to spray herbicides is 3 5 leaves, the best time to spray control agents is 6 10 leaves, and the best time to top dressing is 9 11 leaves, etc., because they are not indicated to be leaves, so the leaves mentioned here refer to the visible leaves, which include leaves and visible leaves. Some people also think that it refers to the complete leaves, but in production practice, if calculated according to the leaves, it will be 2 or 3 leaves later, miss the best period for weeding, and the weeding effect of the same herbicide is not ideal.

Corn is smooth to the touch from the 5th leaf down (including the 5th leaf). When the sixth leaf grows, the leaf will be hairy. Therefore, to tell the number of leaves of corn, you only need to touch it with your hands.

The first leaf is hairy, that is, the sixth leaf, and then count it upwards.

Corn is an annual herbaceous plant in the family Poaceae. It is also known as bud valley, bud rice stick, maize, pearl rice, etc. Corn is native to Central and South America and is an important food crop in the world of Shiyuan jujube.

Compared with traditional rice, wheat and other grain cavity imitations, corn has strong drought tolerance, cold resistance, hail resistance, barrenness resistance, and environmental adaptability.

As a high-yield grain crop in China, corn is an important feed for animal husbandry, aquaculture, aquaculture, etc., and is also one of the indispensable raw materials for food and chemical industries.

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. There are a total of 13 19 leaves of maize, and the heading stage of maize is from jointing to tasseling. <

The 5th leaf of corn below (including the 5th leaf) is smooth, and when the 6th leaf grows to the 6th leaf, the leaves begin to be hairy, so the number of leaves can be separated by dust, just 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.