The chief expert of wheat and Professor Li Yanming of Hebei Agricultural University analyzed the wheat seedlings in the project area of ​​the province this spring. According to the fact that this year's returning green to wheat is delayed and the growth period is likely to be shortened, then the actual situation of wheat yield formation will be affected. This spring wheat is proposed for different seedlings. Technical advice on classified management such as planning, repression, and rational transport of fertilizers.
First, many questions about wheat this spring
Professor Li Yanming believes that affected by the low winter and early spring temperatures, the current spring wheat is generally delayed by five to seven days compared with the normal year. It is one of the years when the return to green is relatively late, and there are more green and dry leaves of winter wheat, which is not conducive to the early occurrence of wheat. This in turn affects the ear differentiation time of wheat, and may delay the heading date of wheat and shorten the grouting time. In addition, there are many threats such as pests, weeds, lodging, drought and late spring in the management of wheat this spring. Management can not be taken lightly.
Second, the plan to suppress the rapid development
Since the beginning of the spring, the research group has examined the results of the wheat fields in the project areas of the province. Professor Li Yanming pointed out that due to the freezing and thawing of soil in winter, the surface soil of the wheat is generally relatively loose. As temperature rises and wind power increases in the spring, soil evaporation will increase and loss of wheat will increase. Therefore, the most important task of wheat management in this spring is to suppress repression and promote early-onset seedling growth. It is necessary to promote the formation of capillaries in the soil through repression so as to increase the water content of deep soils, moisten the growth of roots, and promote the turning green. In the wheat fields with prosperous tendencies, the suppression of growth in the aboveground areas through suppression will lead to a strong growth. There are sufficient wheat fields at the bottom and the top of the table. Cut the soil capillary through the cut, reduce the evaporation of water, increase the temperature of the ground, and promote greening. "Taking into account the effectiveness of the measures, the regions with conditions should carry out mechanized repression and play a comprehensive role in remedying cracks, lifting floods, and increasing temperature and promoting seedling growth."
Third, the classification promotes the management of fertilizer
According to Prof. Li Yanming, the level of fertility of a type of wheat field in the wheat area of ​​Hebei Province this spring is relatively high. It belongs to strong seedlings and wheat fields and should be controlled and promoted to increase the percentage of tillers and spikes, and to increase the number of spikes and grains. Can be applied during the jointing stage of wheat watering, mu recovery urea 16 ~ 18 kg. “After the delay of the return to the young, it is expected that the southern and eastern parts of the province will enter the jointing period in early April and April 20, respectively.†For the second type of wheat, the focus of spring fertilizer and water management is to consolidate the pre-winter delivery. Promote spring delivery and increase tiller rate. The general level of soil fertility in the initial rise of wheat watering, fertility level higher in the middle of the top-dressing watering, combined with watering acres of urea 15 ~ 17 kg. The area of ​​the three types of seedlings this year is relatively small, including a part of late-seeding weak seedlings, and some of them are caused by drought and frost damage. The spring topdressing is carried out in two stages. The first time the fertilizer is applied for watering in the returning green stage, 5~7 kg of urea and appropriate amounts of diammonium phosphate are used to consolidate the tillering before winter, promote spring tillering, and increase the number of mu spikes; the second time The jointing process is carried out in the middle of the jointing stage, and the combined application of watering urea of ​​8 to 10 kilograms of urea increases the number of grains per ear. For wheat fields with prosperous tendencies, strong measures must be taken to prevent lodging. First, before and after returning to Qing, it is necessary to suppress and control the joints before the jointing. The second is to spray Zhuang Feng'an before the jointing on wheat fields with lodging threats. Long; Third, the first fertilizer in spring is postponed until the jointing stage, controlling the small squatting, promoting big scorpion, realizing the later stage of the foot and increasing the ventilation.
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