In recent years, with the continuous increase of corn production level, increasing the planting density and increasing the number of acres of harvested panicles has become an important way to achieve high maize yield. However, with the increase of corn planting density, lodging problems have become increasingly serious. For example, in Hebei Province in 2008, the area of ​​corn lodging was more than 1.5 million mu, which had a certain impact on the high yield and stable production of corn. How to increase the plant's resistance to lodging and reduce the occurrence of lodging under conditions of high density planting and windy and rainy conditions?
I. Selection of resistant varieties One maize variety is susceptible to lodging, which is mainly related to the plant characteristics of the variety. In general, the higher the plant height, the higher the ear position (the height of the node where the fruit was inserted from the ground), and the greater the chance of lodging the stalks with fine stems and poorly rooted varieties. Higher plants, especially those with higher ear heights, have unstable center of gravity. Slightly stalked varieties are prone to stem breakage, while roots with poorly developed varieties are prone to roots fall. The resistance of the species is only relatively speaking, and no species can absolutely resist.
Second, the appropriate period of sowing lodging is also related to the growth and development characteristics of the plant. Generally before and after tasselling, the plant height has been stereotyped or nearly stereotyped, and the stem is relatively weak, and it is prone to lodging when it encounters strong winds and rainy weather. During the suitable sowing period, the spring maize can adjust the sowing date so that the plants susceptible to lodging can avoid the strong wind and rainy season. For summer maize, late-seeding corn is easy to pick up stalks under high temperature and rainy conditions. The plants are taller and the stems are slender, and it is easy to fall down. Therefore, the summer corn should be sown early after harvesting wheat.
Third, appropriately increase the line spacing corn has a wide line, narrow line, width and narrow line and other planting patterns, a variety of different planting patterns can achieve high yield. However, from a healthy cultivation point of view, proper increase in row spacing under high-density conditions can enhance the ventilation and light transmission capacity of the field, and it is conducive to the development of stem segments at the base, and it can also reduce the resistance of field corn plants to the wind. To reduce the risk of lodging. The row spacing of corn can be controlled at about 70 cm, generally not less than 60 cm.
4. Potassium fertilizer with potash fertilizer has the effect of increasing the stalk strength. In the case of large-scale application of nitrogen fertilizers in the current production, it is of great significance to promote the application of potash fertilizer and nitrogen and potassium combined application to prevent lodging of maize plants. Potassium fertilizer should be applied early and used as seed fertilizer when sowing or seedling fertilizer after emergence. The application amount can be determined according to the conditions such as soil fertility. Generally, potassium sulfate or potassium chloride can be applied to 10-20 kg per acre.
V. Seedling seedlings The seedlings can be seedlings for plots with high density and prosperous tendencies. The main role of seedlings is to control the prosperous growth of stem segments and promote root development, thereby reducing the incidence of lodging. Seedlings should be made at the seedling stage, but they should end at the beginning of the jointing. The measures for seedling emergence include moderate drought, root cutting, and nitrogenous fertilizer. Judging from the present situation of corn production in Hebei Province, the seedlings are mainly suitable for spring maize. Since the summer corn will enter the high temperature and rainy season after emergence, there is basically no chance of seedling emergence.
Sixth, topdressing nitrogen maize during topdressing during nitrogen fertilization can promote the development of plants or ears, is conducive to improving grain yield. However, improper application of topdressing nitrogen can easily cause lodging. During the jointing stage, the stem segments at the base of the corn begin to rapidly elongate. At this time, if a large amount of nitrogen fertilizer is applied, the elongation of the base stem segments will be accelerated and the risk of lodging will increase. Therefore, it is generally not advisable to apply nitrogen fertilizer during the jointing stage in production. Under the premise of applying seed fertilizer or seedling fertilizer, nitrogen fertilizer can be delayed until the big bell-mouth period. This will not only promote the development of the ear, but also reduce the occurrence of lodging.
Seventhly, cultivating soil and cultivating soil can promote the development of stem rooting and root growth of the above-ground stem, and enhance the ability of the plant to resist the root down. It is one of the effective measures to prevent corn lodging. Earthing can be carried out before jointing to ridge-sealing. The depth of cultivating is generally 5-8 cm, and the height of net cultivating earth is generally 8-10 cm.
VIII. Chemical control Some chemical regulators with growth inhibitory effects can be used to control the height of corn plants and to some extent prevent the lodging of corn, such as Jindele, Jade Gold, and Teng Tianbao commonly used in current production. . Chemical control technology is a kind of “passive†measure. The use period, concentration, and spray method of chemical control agents must be strictly followed by the requirements of the product specification. Otherwise, it is prone to phytotoxicity.
Red Ginseng has the functions of invigorating vital energy, nourishing blood, nourishing heart and soothing mind. Red ginseng can regulate the nervous, cardiovascular and endocrine systems, promote the body's material metabolism and the synthesis of protein, RNA and DNA. Red ginseng can improve the brain, physical activity and immune function, enhance, anti-fatigue, anti-cancer, anti-aging, anti-radiation, heart-nourishing and pulse-restoring, tranquilize the mind, invigorate the lung and invigorate the spleen.
Rose Petals Tea,Rose Bud Tea,Dried Rose Petals For Tea,Rose Flower Tea
Lixian Spring Pharmaceutical Co., Ltd. , https://www.lxctyy.com