Corn planting in Henan: grasping the medium-term management and building a high-yield shelf

Nowadays, corn in most parts of Henan Province has entered the small trumpet period, and some of the earlier sowing areas have entered the big trumpet period (collectively referred to as the ear stage). The growth and development of this stage of maize is characterized by strong growth of vegetative organs, rapid growth of shoots and leaves in the shoots and secondary roots in the shoots. The tassels and ears begin to differentiate and form one after another. The plants turn from simple vegetative growth to vegetative growth and reproductive growth. Into the stage. This period is the most vigorous period of corn growth, and it is also an important period of corn field management. Therefore, this newspaper invites the National Corn Industry Technology System Xinxiang Comprehensive Experimental Station to write this manuscript, hoping to guide farmers in Henan Province to do a good job in corn management in this period, and lay a solid foundation for the continuous increase of corn production in Henan Province!

At present, corn growth has entered the earing stage, and it is also an important period of corn field management. At this stage, the main target of corn field management is to promote the stalk and strong ear, ensure the healthy growth of the vegetative body, and develop the ear well, and strive to have large ears and many grains. To achieve these goals, we can adopt the following production management techniques:

Follow the ear fertilizer. In this period, the plant grows vigorously, and it has the most absorption of mineral nutrients and the highest absorption intensity. It is an important period for the absorption of nutrients in corn during its lifetime, and it is also a key period for fertilization. In this period, the application of nitrogen fertilizer can effectively promote the differentiation of florets and the emergence of large grains. Therefore, the earing stage is mainly to apply quick-acting nitrogen fertilizer. The amount of topdressing can be determined according to the ground force, seedling condition, etc. Generally, 20-25 kg of urea or 50-65 kg of ammonium bicarbonate is applied per mu. Drain the deep side of the row side or apply it at the side of the plant. If it is applied on the surface, it must be combined with irrigation or effective rainfall to prevent fertilizer loss. Where there are conditions, small-scale cultivating fertilizer machines can be used for fertilization operations.

Water management. After entering the earing stage, the demand for water in corn plants increased, and drought stress caused the number of effective flowers and the number of grains to decrease, which also caused difficulty in tasseling and formed a “ka neck drought”. At the earing stage, attention should be paid to possible drought conditions, and irrigation should be flexibly controlled according to weather conditions and soil moisture. On the other hand, if the rainfall is too large and there is a large amount of water in the field, it is necessary to combine the cultivating and cultivating the soil to discharge the accumulated water in time.

Cultivate the soil. Inter-cultivation can loosen the soil and contribute to the development of the root system. It can also remove the weeds in the field and make the soil more exposed to rain. The soil can promote the development of aerial roots and effectively prevent the lodging caused by root dysplasia; in addition, the soil can also bury the weeds, and the furrows formed after the soil are conducive to field irrigation and drainage. The cultivating and soil-cultivating operations can be carried out in combination, and the height of the soil is preferably 7-8 cm. In wet and heavy plots, as well as in windy and rainy areas and in windy and rainy years, the effect of increasing yield and stabilizing the soil is more obvious.

Pest Control. The ear stage is the prosperous period of various diseases. The main diseases are sheath blight, top rot and bacterial stem rot. It is also the obvious stage of brown spot disease, rough disease and herbicide phytotoxicity. It can be sprayed with 50% chlorothalonil, 50% carbendazim and other wettable powders 500-800 times, or 70% thiophanate-methyl wettable powder.

The main pests are corn borer, cotton bollworm, beet armyworm, armyworm, etc. You can choose pyrethroid insecticides, organophosphate insecticides and insect growth regulator insecticides that are relatively safe for the environment, and use high stalk crops. Spraying with a sprayer; applying granules such as phoxim, chlorpyrifos or Bt to the bell mouth; or using the attractant, insecticidal lamp, sweet and sour liquid to trap the adult in the adult stage; where there are conditions, it can be used in the corn borer Trichogramma was artificially released at the peak of cotton bollworm eggs.

Control and anti-fall. Areas and plots with high density, excessive growth, and poor resistance to lodging can be sprayed with regular chemical control agents during the 6 to 8 leaf extension period of corn, which can enhance the strength of straw, control plant height, prevent lodging, and thus achieve The purpose of increasing production.

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