Corn deficiency syndrome picture corn is easy to lack what elements

Zhengdao Fertilizer Network comprehensive news, the symptoms of corn planting lack of micro-fertilizer corn is easy to lack of elements? In the growth and development of corn, such as the lack of trace elements will show a variety of corresponding symptoms, identify corn deficiency and scientific application of micro-fertilizer for remediation, It is an important technology in corn cultivation.

In the zinc-deficient seedling stage, the young leaves are light yellow and even white seedlings are produced. The middle leaves have obvious green color and the old leaves are gray-brown. At this time, 1.5 to 2.0 kg of zinc sulphate may be applied or sprayed with 0.2% to 0.3% of zinc sulphate solution, and sprayed 3 times, each interval of 5 to 6 days.

The leaves of the old molybdenum-deficient leaves are chlorotic and yellow, and the leaves are scorched inward and curled, and the kernels shrink. At this time, foliar spraying can be carried out using 0.15% to 0.2% ammonium molybdate solution.

The leaf veins of the new iron deficiency were chlorotic and yellow, and the veins remained green and showed a stripe shape. The stems and leaf sheaths were purple-red. At this time, 0.2% to 0.3% of the ferrous sulfate solution is sprayed on the leaves, and it can be sprayed 3 times, every interval of 5 to 7 days.

The young leaves lacking boron can not be opened and whitish, and gradually wither and die. There are white stripes between the leaves of the old leaves, and the plants are short and thin. At this time, 85 grams of borax or 50 to 60 grams of boric acid can be used in acre, and 60 kilograms of water can be sprayed on the foliar surface, which can be sprayed 3 times, every interval of 5 to 7 days.

The symptoms of Mn deficiency often start from the new leaves, the young leaves turn yellow, there are green spots between the veins, the leaves are soft and the roots are slender and white. At this time, the 0.2% manganese sulfate solution can be used for foliar spraying 2 to 3 times, each interval of 7 to 10 days.

The copper-deficient plants grow slowly and are short, and the tops form a cluster after they die. The leaves are grayish yellow or reddish yellow with white spots and the ear development is poor. It can be applied to 1 kg of copper sulfate or foliar spray with 0.2% copper sulfate solution.

High-yield fertilization technology for corn

The high and low yield of corn is directly related to fertilization. Therefore, if you want to increase production and income, and improve the economic benefits of corn planting, you must master the scientific application method of fertilizer.

Fertilization principle

When applying chemical fertilizer, it is necessary to apply sufficient base fertilizer, use good seed fertilizer; lightly apply joint fertilizer; apply heavy panicle fertilizer; apply appropriate granular fertilizer; use root dressing according to actual conditions.

2. Reasonable fertilization

It is necessary to grasp the amount of nitrogen, phosphorus and potassium required for each growth period of corn. Generally, 100 kg of corn kernel requires 3.6 kg of nitrogen, 1.5 kg of phosphorus, and 3.1 kg of potassium. The nitrogen:phosphorus:potassium is 2.4:1:2.1, and the rate of absorption and utilization of nutrients in different growth stages of corn is different. The period in which corn is most fertilized is from the big trumpet period to the tasseling period. Nitrogen fertilizer topdressing must be applied in depth; phosphorus is applied in the production of strips; the uniform distribution of potassium in the soil is beneficial to root absorption.

3. Improve fertilizer utilization

3.1 The bottom fertilizer requirement depth is about 20cm. It is mainly based on farmyard manure. Combined with the application of chemical fertilizer, it is beneficial to improve soil structure and fertility, and the fertilizer efficiency of organic fertilizer is long, which can meet the needs of corn for nutrients. The nitrogen fertilizer base fertilizer is preferably urea, and the application amount should account for about 15% of the total amount required for the whole growth period.

According to the test, the application of appropriate amount of nitrogen fertilizer as the base fertilizer, than the nitrogen fertilizer all do topdressing increased yield by about 10%. Phosphorus and potassium fertilizers should occupy 75% to 80% of the total application. Currently, ternary compound fertilizers with 15% active components of nitrogen, phosphorus and potassium can be selected. The application of the bottom fertilizer should be as deep as possible, otherwise it is easy to base fertilizer and mouth fertilizer, and the local soil solution concentration is too high, resulting in burning and burning.

3.2 Fertilizer applied near the seed when the fertilizer is planted is called mouth fertilizer. The mouth fertilizer can meet the demand for nutrients in the corn seedling stage. The effect of applying the seed fertilizer is more significant when the amount of base fertilizer is insufficient or the soil is thin. The mouth fertilizer should be based on quick-acting fertilizers that are easily absorbed by seedlings, that is, high-quality nitrogen, phosphorus, potassium fertilizer and micro-fertilizer. The application of fertilizer should be done to isolate the seeds from the fertilizer. The mouth fertilizer should be applied to the lower side of the seed 3 to 5 cm.

3.3 Topdressing Fertilizers applied during the growing period of corn are called top dressing, which mainly provides the fertilizer needed for the peak of corn absorption. There are three peaks of fat absorption in corn during the whole life, namely, jointing stage, big trumpet period and tasselling stage. After the corn enters the jointing stage, the growth of vegetative bodies is accelerated, the differentiation of tassels is going on, the differentiation of the ear is about to begin, and the requirements for nutrients are increasing. Therefore, the fertilizer is harvested in time, and the yield increase effect is generally obtained.

If the bottom is fat enough, the topdressing can be properly controlled, and the time can be later; when the land is thin, the amount of base fertilizer is small, and the plant is thin, it should be applied more and earlier, accounting for 20% to 30% of the amount of topdressing. When the soil fertility is low or the base fertilizer and mouth fat are insufficient, the fertilizer should be removed when the 6 leaves are unfolded. Jilin Province is around June 25.

3.4 The fertilizer applied by the ear fertilizer before the growth cone of the ear to the tassel is called the ear fertilizer. This period is in the stage of spikelet and floret differentiation, and the vegetative growth and reproductive growth are very strong. The required water and nutrients are the most important, which is the key period for determining the size of the ear and the number of grains. Therefore, the effect of top dressing is very significant, accounting for top dressing. 30% to 60%.

As long as the seedling growth is normal, the re-application of panicle fertilizer can obtain significant yield-increasing effects, especially in the case of insufficient fertilizer, the concentrated application of panicle fertilizer once, the effect of increasing yield is significant. Fertile soil, adequate base fertilizer and seed fertilizer, concentrated application of panicle fertilizer;

On the contrary, apply top dressing and apply the ear fertilizer. When the soil fertility is high, the base fertilizer, and the mouth fat are sufficient, the panicle fertilizer can be traced 7 to 10 days before the tasseling. This can avoid the vegetative growth of plants in the early stage of early topdressing, and it is beneficial to prolong the functional period of the leaves in the late growth stage, which plays an important role in increasing the number of grains per ear and increasing the 1000-grain weight.

3.5 points of topdressing sandy soil, especially sandstone soil, it is not appropriate to topdress once too much, should be topdressed, can reduce leakage and volatile losses. Topdressing must be pursued. Practice has shown that the depth of topdressing reaches 8 to 10 cm, which increases the yield by 10% to 15%, and the fertilizer utilization rate increases by about 15%.

Granular fertilizer can be determined according to the situation, mainly to prevent premature senescence of the leaves and increase 100-grain weight. High-yield fields account for 10% to 20% of topdressing. All in all, the topdressing index according to the leaf age index is carried out in accordance with the requirements of “low-yield field before and after heavy weight; medium-yield field before light weight; high-yield field front light, medium weight, and after-filling”.

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