This year's corn baldness symptoms are of these categories.
This year's corn baldness symptoms are of these categories. In 2022, the summer corn area of Huanghuaihai suffered from high temperature and drought from sowing to seedlings, and the flowering period suffered extreme high temperature and heat damage since meteorological records began in 1961, and various diseases and pests during the filling stage. Many corn varieties have various symptoms such as empty stalks, no seeds, bald tips, and half of the face. In 2023, corn will have many spikes.
Corn bald tip refers to a development phenomenon in which the top of the corn ear is not firm or not full, generally refers to the lack of grains or no grains at the top of the ear, and the occurrence of bald tip will lead to a decrease in corn yield. Bald tips can be roughly divided into two categories→ true bald tips that have failed pollination. The reproductive environment occurs from the large trumpet stage of corn to the male loose flour stage, and the unfavorable situation will lead to the degradation or sterility of the female florets during the differentiation process. Filigree death during pollination, low pollen count or insufficient pollen activity in male spikes can also lead to pollination failure and bald tips.
The baldness produced by this condition is generally due to extreme weather that affects fertility during this period, such as when the temperature is continuously higher than 35°C, which is not conducive to pollen formation. Flowering loose powder is hindered, which is manifested in the smaller branches of male spikes and a decrease in number. Florets degenerate, anthers, leanness, pollen vitality decreases, the degree of damage increases with increasing temperature and duration. When the temperature exceeds 38°, the male panicle cannot bloom and the loose powder is obstructed. The seeds are sterile → false bald tips. Can pollinate normally but is affected by adverse climatic conditions, the grain development process is hindered, resulting in septicism and baldness.
Corn ears have normal pollination, and there are grains at the top, but the kernels cannot develop normally, resulting in septic growth, forming bald tips produced by phenomena such as unsolid grains and small grains. This situation occurs after the corn has completed pollination, so it is recommended that the grower in the corn. After loose powder, field management should also be strengthened to avoid false baldness.
The main cause of corn kernel sterilization
High temperature: According to the investigation, the continuous high temperature weather from the second sentence of July to the first sentence of August this year has also led to the phenomenon of missing grains (flower grains) or protruding half of the face in the local area of Huanghuaihai summer corn planting, which may seriously affect the later yield.
Corn flowering and pollination in the Huang-Huai-Hai area is concentrated from the end of July to the beginning of August, and since August 4 this year, many places have continuously issued high temperature warnings, and the extreme temperature in various places is above 35 ° and up to 39.9 degrees, causing different degrees of heat damage to summer maize. It is certain that this is the most direct cause of the lack of grains, flower face or half of the face of this year's summer corn, and the meniscus shape and deformed protrusion of the cob.
Drought: Drought weather is an important cause of malformation of corn ears, because drought will reduce soil water content and affect the transport of nutrients by corn, which will not only affect the normal growth of the aerial part of corn, but also inhibit the normal development of maize roots, and further deteriorate the absorption capacity and level of nutrients by plants. It leads to the occurrence of malformations of corn ears, such as bald spikes and missing ears.
Lack of fertilizer: corn is a high-yield crop, the demand for various nutrients is also very large, lack of fertilizer or the lack of a certain nutrient can also lead to the occurrence of corn ear deformity, such as bald spikes, lack of grain ears, beer bottle ears, etc.
Variety: The difference in the characteristic characteristics of corn varieties can also lead to the occurrence of maize ear deformity. For example, some corn varieties have short bracts and long-term rainy weather. Rain seeps into the ears of fruit and causes ears to bud; Some varieties of corn fruit ears are not well sealed, resulting in bald spikes and so on.
Others: Some mechanical injuries and animal nibbling can also lead to the occurrence of deformities such as the tip of the corn ear. Preventive measures for deformed ears such as corn spikes.
Maize varieties: select suitable corn varieties according to local conditions to effectively prevent the occurrence of deformed ears such as corn spikes. Scientific water and fertilizer management: master the application of sufficient base fertilizer, light application of seedling fertilizer, heavy application of jointed fertilizer and pregnant ear fertilizer. The principle base fertilizer of skillful application of seed fertilizer is mainly organic fertilizer, and an appropriate amount of nitrogen, phosphorus and potassium fertilizer is applied. In addition, combined with irrigation water, the method of using water to transfer fertilizer is adopted to accelerate the exertion of fertilizer efficiency, improve the nutritional status of plants, and enhance drought resistance. In high temperature periods, foliar spraying can be used not only to cool down and humidify, but also to supplement the necessary water and nutrients for maize growth and development. Reasonable dense planting: reasonable dense planting of maize is an effective measure to improve the yield of maize, but also the main means to prevent deformed ears such as maize protrusions, lodging resistant compact maize varieties are suitable for dense planting, leaf lush and loose maize varieties are suitable for sparse planting, strengthen pest control. Pay attention to the control of corn borer aphids during the corn pumping period. Chemical control is mainly spray,
