Heavy rains increase in summer and autumn, and corn is prone to varying degrees of lodging. In order to ensure a good harvest of autumn grain, countermeasures should be taken as soon as possible to classify and manage the already fallen corn.

First, the lodging situation

The corn is divided into three types : stem down, root down and stem fold . Stem pour refers to stem sloping after a storm due to excessive plant height, slender stem stalks, and poor mechanical strength of the base. Root pour means that the root system is poorly developed, and when the soil is too soft, it starts to fall from the root and has a large inclination. Stem fold refers to the fact that the stem tissue is young or damaged by pests and diseases before the tasseling.

Second, the cause of lodging

　　 1. The popularization and application of small rotary tillage machinery causes the soil tillage layer to be too shallow, which affects the development of deep roots of corn.

　　 2 , part of the corn planting plant is tall, stems are weak, and the toughness is insufficient.

　　 3 , the density is too large, the group ventilation and light conditions are poor, poor individual development.

　　 4 , the application of phosphorus and potassium fertilizer is insufficient, and the stem of the plant is poor in flexibility.

　　 5 , corn glutinous rice control is not timely, corn roots and stems have holes.

　　 6. In case of severe weather such as heavy rain or strong winds.

Third, remedial measures

　　 1 , stems down. After the rain, gently shake the rain on the plant with bamboo poles to slowly restore growth. Try not to flip the plants when shaking off the rain, so as not to break the stems.

　　 2 , roots down. Timely support the planting soil, and when it is raised, it should be early, slow, light, and fixed with soil. After the lodging occurs, it should be lifted in 1-2 days. Some of the roots have been damaged when the corn is lodging. When the straightening is done, it is necessary to prevent the root injury from increasing again. It is best to operate the two together. One of them grabs the corn plant and gently pulls it up from the upper part, and the other cultivates the soil at the root. Once the plants are bent upwards, they cannot be supported.

　　 3 , stem folding. Lodging plants are usually difficult to recover and should be removed in time.

Fourth, strengthen disease prevention

After the corn is lodging, it is more prone to disease, and it is vulnerable to corn borer, big spot disease and small spot disease. It needs timely drug control. With 70% thiophanate 800 times or 500 times spraying 50% carbendazim every 7 days and then spray a second. And timely topdressing to restore corn growth as soon as possible, the application of urea 5 to 10 kg or spray 0.2 % to 0.35 % potassium dihydrogen phosphate solution.