Summer corn is an important crop in autumn in our county, the flood disaster is extremely harmful to summer corn in our county, the provincial corn industry system experts in view of the actual situation, put forward post-disaster management opinions for farmers' reference:
I. Technical Suggestions for Post-disaster Maize Management (Prof. Robin Cui, Agricultural University of Hebei)
1. Eliminate water in the field. If there is a clear water accumulation in the field, everything should be done to eliminate the water in the field and reduce the time when the corn plants are soaked.
2. Medium cultivation and dispersion. For plots that have been eliminated from the field of water accumulation or only plots that have been damaged, they can be ploughed and hoeed in time when the field can enter the ground.
3. Supplement the application of fast-acting fertilizer. In view of the fact that the summer corn in our county will enter the big horn mouth period, it is recommended to combine the fertilizer in the big horn mouth period with the fertilizer management after the disaster. Plots that have not yet been fertilized can be applied urea 20-25 kg per mu of plots that have been fertilized with panicle fertilizer can be applied with urine another 5-10 kg per mu. When topdressing, it is necessary to open a trench and apply deeply, or combine it with medium tillage to avoid spreading. Conditional in the rain after the sunshine in time with urea 0.5% + potassium dihydrogen phosphate 0.2% foliar topdressing, spraying must ensure that urea and potassium dihydrogen phosphate completely dissolved and mixed, so as not to cause excessive local concentration and cause leaf burns, aggravating the degree of disaster; generally can be sprayed twice consecutively, intervals of about 7 days.
4. For plots where lodging occurs, corresponding field management measures can be taken according to the specific circumstances of lodging.
(1) Summer maize is currently in the small trumpet mouth stage, and it generally does not need to take special management measures after lodging, and it will slowly resume its upright growth after rain.
(2) In the summer sowing plot that was washed down by the flood, some of the leaves of the plant were often buried by silt, making it difficult for the plant to restore its upright growth; such a plot should remove the soil on the leaves as soon as possible after the disaster, or use a sickle to cut off the leaf part buried by the silt to help the plant resume upright growth as soon as possible.
(3) Summer-sown maize with partial silt in the heart leaf after lodging often leads to difficulty in subsequent heart leaf extraction; this kind of plot can be cut with a sickle after the disaster to cut the heart leaf part of the silt into the sediment to help the subsequent leaves to be extracted. However, the fewer leaves to cut, the better, and try not to hurt the growth point at the top of the plant.
II. Prevention and Control Technology of Summer Corn Disease and Cordyceps After Flood Disaster (Professor Zhang Jinlin, Agricultural University of Hebei)
1, improve the awareness of weed control: at present, most of the summer corn has entered the ridge, you can choose 10% ammonium glufoss phosphine 200 ~ 300mL / mu through the corn inter-row directional spray to weed. However, when using glufosinate for inter-row directional weeding of corn, try to lower the sprinkler head as much as possible to reduce the spraying of the agent to the corn to prevent drug damage.
2. Prevention and control of leaf spot disease mainly based on maize brown spot disease: according to the characteristics of more rainfall this year, various leaf spot diseases mainly based on brown spot disease will occur more heavily. The prevention and treatment of maize brown spot disease is still based on the administration of fungicides, and the recommended agents are: (1) 10% phenoxymethozole water dispersible granules or 12.5% enazolidin wettable powder or 25% propiconazole suspension 2000-2500 times; (2) 10% azoxystil suspension 1000-1500 times; (3) it is not recommended to use pentazole or daisen protective fungicides, carbendalin and methyl tolbuzin and other agents have average effect and are not recommended.
3. Strengthen the control of pests such as brown-footed horned pectoral carapace: adult brown-footed horned thora carapace nibble on the middle and upper leaves or leaf centers of corn, forming a network of holes. When the amount of insects is high, the leaves can be eaten and the leaf veins are left, resulting in yield loss. Prevention and control recommendations: (1), timely removal of weeds, effectively reduce the harm of brown foot horn pectoral nails; (2), timely drug control of adult insects, recommended agents: thiamethoxine or pyridoxone or acetomidium + cypermethrin.