At present, corn in the four northeastern provinces has entered the emergence stage. Recently, a large-scale rainfall cooling process has occurred in the region, and the minimum temperature in some areas has dropped to 0 °C. Generally speaking, rainfall is very beneficial to soil growth, effectively improving soil moisture, and drought in most areas has been alleviated. The drought in Heilongjiang and Jilin has been completely relieved, which provides good conditions for seed sprouting and provides good for plots to be planted. Lyric, but individual plots suffered from freezing damage. In view of the current corn emergence situation and climate characteristics, the northeast region should focus on four aspects of seedling management.
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First, timely broadcast and rapid seeding, timely discharge. Normal management of plots that are not significantly frozen or lightly frozen. For uncultivated plots, when the weather improves and there are conditions for field cultivation, the machinery will be quickly planted, the planting progress will be accelerated, and the quality of planting will be ensured. In areas such as the eastern part of Heilongjiang where the soil moisture is too large, it should be timely drained and warmed up, and timely planted when the temperature and humidity are appropriate.
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The second is to investigate the situation of buds and strengthen the classification management. Investigate the buds before emergence, and replant the seeds in the dry and bad plots in time. For more than 80% of the plots, there is no need to replant, and two strains can be left in the same place or in the neighboring line. For more than 60% of the plots, the seedlings will be postponed, and the double plants will be selected and the varieties with short growth period will be used to replant or raise seedlings. For plots with less than 50% emergence , early planting of varieties with short growth period or other crops, increase planting density appropriately. For the frozen tip of the leaf tip, take deep pine, early sputum, and sputum, etc., to improve the ground temperature and root activity, and promote early growth and long-term; if the freezing damage is serious or the growth point has frozen to death, the weather will be replanted after the warming up or Seedling transplanting.
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The third is to cultivate and topdress early, and promote early fast-growing. After emergence, according to the leaf age index, early cultivating and staged topdressing should be carried out to avoid surface application without any effective rainfall. The depth of topdressing on both sides of the plant line is 5-10 cm, which promotes the early growth of seedlings and accelerates the development of roots to ensure the plant is robust. The sowing date is delayed and the frozen land is taken. The principle of “promoting and controlling†is adopted. The early topdressing or foliar application of growth regulator or foliar fertilizer can reach the seedlings, the seedlings, the seedlings and the seedlings. basis.
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The fourth is to strengthen forecasting and forecasting and control pests and diseases early. Strengthen pest and disease monitoring and early warning, focus on and prevent root rot, rough disease, large and small spot disease and underground pests. It is necessary to do a good job in the prevention and control of pests such as scorpion mites and mites, and the size and spot disease can be sprayed and controlled in the 6-7 leaf stage. For underground pests such as cockroaches, golden worms, ground tigers, and cockroaches, the lower part of the corn sheath and the base of the stem can be sprayed with pesticides to make the liquid penetrate into the base of the corn, or to be rooted after dilution, to improve the control effect.
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Ministry of Agriculture Corn Expert Steering Group
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National Agricultural Technology Extension Service Center
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Source: Department of Plantation Management, Ministry of Agriculture
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