In recent years, lodging has become an important factor constraining the high yield of corn. Prevention and remedial measures should be taken early in production.

Lodging type of corn lodging is divided into three kinds of stem fall, root down and stem fold. Stems refer to stems tilting after a storm due to high plant height, slender stalk internodes, and poor mechanical strength at the base. The root down is that due to the poor development of the root system, the roots begin to fall down and the inclination is large when the soil is too soft. Stem folding refers to the breakage of the wind due to the young tissue of the culm before tasseling or the risk of pests and diseases.

Lodging Reasons (1) The popularization and application of small-scale rotary cultivating machinery causes the soil cultivation layer to be shallow, which affects the development of deep root system of corn. (2) Some corn varieties are tall, with weak stems and insufficient toughness. (3) The density is too high, the population has poor ventilation and light transmission, and individuals have poor development. (4) Insufficient application of P and K fertilizers, plant stems have poor flexibility. (5) The corn borer is not controlled in time, and there are holes in the roots and stems of the corn. (6) During the growing period of corn, there were many rainy days and insufficient illumination, which caused the stalk tissue to be tender and weak. (7) Severe weather such as heavy rain, hail, and strong winds.

Preventive measures (1) Properly deep plowing to promote root development. (2) Choose corn varieties with short plants, low ear positions, well-developed root systems, and internodes under the ear, such as Zhengdan 958. (3) According to the traits and fertility of the plant, the vertical planting species generally have 4500 seedlings per mu, and the flat leafing variety has 3500 plantings per mu. (4) Formula fertilization, application of phosphorus and potassium fertilizers to promote plant growth and robustness. (5) Fields with prosperous tendencies at the seedling stage are planted with the method of cultivating roots and controlling water, and the joints are ploughed till the small bell-mouth stage, and the middle stage of cultivating after the small bell-mouth period, which promotes the development of the root system. (6) Reasonable control and reduction of plant center of gravity. (7) Timely control of corn borer.

Remedial Measures After lodging of corn, appropriate remedial measures should be taken according to different situations. (1) Stems fell. After the rain, use bamboo sticks to gently shake off the rainwater on the plants so that they can gradually recover their growth. When shaking off the rain, try not to turn the plants so as not to break the stems. (2) Roots down. Planting uprooted plants in a timely manner and then spraying 0.2% to 0.35% potassium dihydrogen phosphate solution. (3) stem folds. Lodging plants is usually difficult to recover and should be cut off in time. It is worth noting that corn is susceptible to corn borer, large leaf spot, and leaf spot disease when lodging, and it needs to be controlled in time.

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