Corn is a crop that requires a lot of water but is not resistant to cockroaches. When the soil moisture exceeds 80 % of the maximum water holding capacity , the corn is stunted, especially in the corn seedling stage. After the germination of corn seeds, the earlier the damage occurs, the heavier the damage. The longer the flooding time, the more severe the damage, and the deeper the flooding, the heavier the yield. Flooding generally cut more than 20% four days, flooded three days, plant death. Remediation measures should be taken as soon as possible after the occurrence of waterlogging in corn, to minimize losses.
Drainage and drop stains. It is necessary to dredge the Tiantougou, the furrow and the lumbar sulcus, and timely eliminate the accumulated water in the field, reduce the soil moisture, and achieve the purpose of arranging and reducing energy.
Cultivate loose soil. When the ground is white after precipitation, it is necessary to cultivate the loose soil in time, break the soil compaction, promote the soil to dilate and breathe, improve the rhizosphere environment and promote root growth. The lodging of the corn seedlings should be timely and righted up.
Apply seedling fertilizer early. It is necessary to timely apply the seedling fertilizer, and apply 20 kg of urea per acre during the big bell period . For fields with long flooding time and serious waterlogging, high-efficiency foliar fertilizer and root-promoting agent should be sprayed at the same time as fertilization to promote recovery.
Strengthen pest and disease prevention. After the cockroaches, various pests such as large and small spot diseases and corn mash are prone to occur. When spraying foliar fertilizer, pest control can be carried out at the same time. The control of sheath blight can be sprayed with Jinggangmycin or carbendazim. When spraying, it is important to spray the stems and leaves below the ear; for the prevention and treatment of large and small spot diseases, chlorothalonil or methyl thiophanate can be used, once every 7 to 10 days, for 2 to 3 consecutive times. Times. The control of corn mash should be formulated into toxic soil or phoxim in the period of jointing to trumpet.
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