Protect seedlings

After the emergence of corn, it is necessary to check the seedlings and seedlings in time. Before the corn clover stage, it was found that there were 3 strains (holes) above the continuous lack of seedlings, and the seedlings should be replenished in time. The method of replenishing the seedlings: 1. Replenishing the seeds (planting after soaking and germination); 2. Replanting the seedlings and planting them in time. , shorten the time of slow seedling and ensure survival.

Timely seedling

Timely seedlings and seedlings are the key to reducing the rate of weak plants, improving the uniformity of the population, and ensuring the appropriate density. Corn grows fast, and it should be timely and timely seedlings. If the seedling time is too late, the seedlings will be crowded underground and aboveground. The nutrient area of ​​each plant will shrink and compete with each other. Water competition will affect the healthy growth of seedlings. Therefore, it is necessary to cultivate seedlings in early morning and early seedlings, which should be carried out in sunny afternoon. The main methods are as follows: 1. The seedling time is carried out in 3 leaves. The principle is that the dense and dense leaves remain, and the weak seedlings stay strong and the seedlings are kept. 2. The seedling time is carried out when the seedling grows to 5 leaves, and the weak seedlings are removed to keep the seedlings at one time. 3. Soils with poor soil moisture and heavy pests should be postponed appropriately to avoid dead seedlings and seedlings, resulting in insufficient seedlings and affecting yield.

Cultivating weeding

After the emergence of corn, due to the increase of temperature, weeds and seedlings grow synchronously, the soil moisture evaporation is large, and yellow seedlings and dead seedlings appear. Early weeding and weeding can eliminate weeds to loosen the air and make the roots deep, which is beneficial to soil microbial activities, promote soil organic matter decomposition, and increase soil effective nutrients. In the mountain corn seedling stage, weeding is no less than two. The first combination of the fixed seedlings mainly masters the principle of “the shallow side of the seedlings and the depth between the rows”, except for the “sandwich grass”; the second time combined with the topdressing in the jointing. This time, it is necessary to get rid of the fine roots that extend into the line, and promote the occurrence of new roots and deep rooting. Expand the absorption surface. Combined with topdressing, the soil is formed to form distinct ridges and gullies. The soil can promote the growth of aerial roots, enhance the lodging resistance of corn, deepen weeds, reduce the consumption of nutrients, and facilitate drainage and flood control.

Cultivating and topdressing

The application of seedling fertilizer has the functions of promoting roots, strong seedlings, promoting leaves and strong stalks, and is generally carried out at the jointing stage after the seedlings are fixed. The method and time of seedling application should be determined according to the conditions of seedlings and soil fertility: 1. For three types of seedlings, transplanted seedlings, weak seedlings of different heights in the same field, use hydrogen carbonate when the seedlings grow to 5 leaves. Ammonium applied water to the fertilizer, which promoted the uniform growth of the weak seedlings. 2. The application of jointing fertilizer can make up for the lack of soil nutrients and promote the formation of strong stalks and large ears of corn. The time for the jointing of the jointing fertilizer is 6.5-7 leaves of the visible leaves and about 35 days after sowing. The jointing fertilizer should be based on quick-acting nitrogen fertilizer, and 20 kg of urea should be chased and cultivated. 3. Corn covered with plastic film should be drilled with 20 kg of urea and covered with holes.

Pest control

The main pests in the seedling stage include earthworms and armyworms. The control tiger can be used to trap larvae by sautéing rice bran or wheat bran (1:50) with 50% Bataan WP. The armyworm can be made into toxic soil with 2.5 kilograms of nail powder and 15 kilograms of fine soil, and applied to the corn heart.

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