Spring is a key period for wheat management. However, due to the influence of rainy weather, the effective accumulated temperature in winter before Shandong is relatively small, resulting in a small population of wheat seedlings, weak individual development, and large differences between regions. Particularly important. Therefore, today Xiaobian said that the Shandong Province wheat classification guidelines for fertilization and watering management measures are as follows. First, wheat seedlings In winter, the pre-wheat seedlings in Shandong Province are generally small and the individual development is weak. The main characteristics are: the proportion of seedlings in one class is reduced, the proportion of seedlings in the second and third classes is increased; the number of weeds in wheat fields is higher than that in winter. There are large differences in seedlings between regions, such as Laiwu, Liaocheng and Linyi, and the wheat populations such as Weifang, Weihai and Zibo are small and individuals are weak. Second, timely refinement, increase temperature and protect 1. Make full use of the advantages of large precipitation in the autumn and winter last year and better bottoming of the wheat field. When the surface soil is frozen 2cm in early spring, the wheat field is slashed to maintain soil moisture, increase surface temperature and eliminate winter weeds. 2, watering in the spring or after the rain should be timely paddling, when drawing, you need to be fine, smooth, flat, smooth, no residue, no pressure on wheat, no weeds, to improve the effect of stroke. 3. Early spring wheat field suppression is an important agronomic measure that is simple, easy to implement, and cost-effective. In the wheat field where the autumn is planted in the ground, the wheat field is crushed after the soil is frozen in the early spring, which can bridge the cracks, reduce the evaporation of water and prevent cold air from invading the wheat seedlings near the tiller. At the same time, for the dryland wheat fields without watering conditions, the wheat field should be repressed after the early spring soil freezing, so as to promote the upper layer of soil water to move upwards, which can play the role of lifting, protecting and drought. For the overgrown wheat field to be suppressed before and after the body-building period, it can inhibit the growth of the aboveground part, and control the growth and strengthening. Third, classification guidance, scientific fertilization and watering 1. Fertilizer management of a type of wheat field (1) A group of wheat field groups: generally 60-800,000 per mu, mostly in the strong wheat field, in management, we must pay attention to promote the combination of control, in order to increase the rate of tillering into spikes, and promote the large number of grains. (2) A high level of soil fertility, suitable for planting, a group of wheat fields with a population of 6-800,000: In the spring, it is necessary to apply the first fertilizer water reasonably. Too early, it will promote the population to be large, and the early premature aging, after applying nitrogen fertilizer to such wheat fields. Shifting can effectively control the excessive proliferation of ineffective tillers, improve the photosynthetic high value duration and root activity of flag leaves in late growth stage, delay aging and increase grain weight. At the same time, in the middle and late stages of wheat jointing stage, watering should be combined with 15 kg of urea per mu to obtain higher yield. (3) The level of soil fertility is general. The group of wheat fields with a population of 600,000 to 650,000: the management of fertilizer and water in the early stage of wheat jointing, combined with watering, 15 kg of urea per mu. 2. Fertilizer management of the second type of wheat field (1) The group of the second type of wheat field: generally 45-600,000 per mu, which is a transition type between weak seedlings and strong seedlings. The key points of spring water and fertilizer management are: to promote the occurrence of spring tillers, to consolidate the tiller before winter, to increase the rate of tillering of winter and spring tillers, and to combine 15 kg of urea per acre combined with watering. (2) The second-class wheat field with a high level of soil fertility and a population of 500,000-600,000: after the wheat is raised, the topdressing and watering before the jointing. (3) The level of soil fertility is generally the same, the group of 45-500,000 second-class wheat fields: fertilizer and water management during the period of wheat uplift.
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