After the beginning of spring, the winter wheat will enter the returning green stage. The period from returning green to picking flags is the spring growth stage, which generally lasts for 50-60 days, and is the key period for the formation of yield. After the wheat returns to green, its growth turns to prosperous, and the absorption of nutrients gradually increases. Therefore, it is imperative to chase and apply joint-stocking and panicle-fertilizer. Fertilization in spring wheat fields should be based on the application of organic fertilizers, reasonable application of chemical fertilizers, improve fertilizer utilization, reduce soil pollution. The general high-yielding fields control nitrogen, stabilize phosphorus, increase potassium, supplement micro crops, stabilize nitrogen in the middle yield field, increase phosphorus, and make additional potassium fertilizers. From the point of view of wheat physiology, from the stage of turning green to getting up, the plants continue to give birth, leaves and hair roots, and start the differentiation of young panicles, which is to consolidate the pre-winter strong seedlings, fight weak seedlings, and strengthen weak seedlings. Period of time. Therefore, according to different types of wheat fields, it is necessary to adopt different fertilizer measures. See seedling fertilization can be summed up in three words: security, promotion, control. Security Years ago, when the winter had reached the "six leaves a heart", there are four or five tillers, mu total stem has reached 800,000, a robust plant, normal color, no yellowing of a wheat field, do not immediately apply fertilizer after returning green Watering to Prevent excessive growth, consume too much nutrients, is not conducive to late high-yield. In such wheat fields, measures such as ploughing, weeding, and pest control should be adopted to ensure effective tillering and safe growth for the past years, which will help increase the rate of spikes in wheat and lay a good foundation for the high yield of wheat in the later period. Field measures are mainly based on "protection", and before and after the jointing stage of wheat, water is fertilized again. This is the so-called nitrogen back-fertilization method, which is beneficial to the high yield of wheat. promote Years ago when planting was too late, the fertility was poor and the base fertilizer was insufficient. When the winter was over, the wheat seedlings were short and the tillers were few; when turning green, the plants were weak, the leaves were yellow, and the total number of stems per mu was less than 400,000; or the straw was returned to the field. Without pouring winter water, the soil is loose and air-permeable, the water evaporates strongly, the soil is arid, and the wheat field where the wheat seedlings appear hanging and rooting phenomenon must be poured back to Qingshui in time to apply green manure. What needs to be emphasized is that it is very important for this type of wheat seedlings to choose fertilizers for the road! First, do not use or use less organic fertilizer. As the saying goes: ring fertilizer land, chemical fertilizer prompt seedlings. Due to the low temperature in early spring, the farmyard manure is slowly decomposed and cannot meet the needs of wheat for nutrients. Second, it is necessary to apply quick-acting chemical fertilizers because fertilizers are fast-acting and can timely supply the growth and development needs of wheat. Urea can produce 10-15 kilograms of urea per gram, pouring it well and returning to Qingshui. On this basis, foliar fertilizers can be sprayed once again to promote new roots, cold resistance, drought resistance, and disease resistance, which will help turn weak seedlings into strong seedlings. Third, we should pay attention to some high yields when fertilizing The weak seedlings in the plots should be given eccentric fertilizers so that the growth of the whole plot will be the same, which will benefit wheat production. control The planting was too early and the planting rate was too large. There was a prosperous wheat crop. Due to premature ridge closure, leaf scattering, and excessively thin leaves, after returning green, they were required to adopt “control†measures. Scratch, try not to water, look at seedlings. In addition, we must pay close attention to whether there is frost damage. If there is frost damage, we should take appropriate measures. covid19 Anesthesia Medical Co., Ltd. , https://www.jssinoanesthesia.com