Disaster relief. When corn is attacked by locust at the germination and emergence stage, it may easily cause soil compaction, ground temperature drop, poor ventilation, affecting seed germination and emergence, etc. The soil should be loosened timely after the disaster to facilitate warming and ventilation; before the jointing of corn to tasselling, especially the big bell mouth Before the stage, when the male and female ears and some leaves have not yet been taken out, they will suffer locust plague. As long as the unextracted leaves are not damaged and the roots remain, they should be cultivated and fertilized in time to strengthen the field management. Generally, a good harvest is still obtained and the maize is suffered after heading. In case of disaster relief, the ability of plants to restore growth deteriorates and has a greater impact on yield. According to investigations, any corn that has been cut off by hail will not be able to resume growth; if the section is intact, management should be strengthened in time to promote plant growth and reduce yield loss.
Wind disaster. In July and August, frequent stormy weather caused corn lodging or stem folding. Corn that is lodging or stem-folding before maturity should be raised in time to avoid mutual pressure and affect photosynthesis. For inverted corn, if it is only rooted, the plants can be straightened. If it is a stem fold, several plants should be bundled together to support the plants.
Disaster relief. Maize is a crop that has a large amount of water but is not tolerant. When the soil moisture exceeds 80% of the field water capacity, the growth and development of plants is affected, especially in the seedling stage. At the late stage of corn growth, under high temperature and rain conditions, the root system often suffocates and dies due to lack of oxygen, resulting in rapid decline of vitality, premature plant emergence, and a great impact on yield. According to surveys, corn usually accumulates water for 1 to 2 days before and after tasseling, and the impact on yield is not obvious. Water yields are reduced by 20% in 3 days and water production is reduced by 40% in 5 days. For corn that suffers from locust plague, early elimination of water in the field, reduction of soil and air humidity, and promotion of plant growth should be encouraged. When the field can be applied normally, cultivator and soil should be promptly removed to eliminate compaction, prevent lodging, and improve soil permeability. The roots of the plants are returned to normal physiological activities as soon as possible, and the available nitrogen fertilizers are promptly increased to accelerate the growth of the plants and reduce the loss of the disaster.
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