I. Timely cultivating and warming Various types of wheat fields should be tightened before they return to green for repression and buckwheat cultivating. For wheat fields with more cracks in the field, pressure should be applied first to compress the cracks to prevent the early spring wind from picking up the roots. After repression, it is also possible to keep warm and raise lice to prevent or reduce the freezing and killing of dead seedlings in early spring. Huanghuai wheat district can inhibit the prosperous growth of the main stem in the late winter or early spring and promote the occurrence of tiller, which is helpful to increase the panicle number and increase the yield. Dryland wheat without watering conditions in all wheat areas should be promptly suppressed in early spring, which can play a certain role in protecting and preventing cold. Second, seedlings strong classification management For wheat fields where there are no shortages of soil, do not rush to top-dressing after returning green. Still, use cultivating loose soil to increase ground temperature, and promote seedlings to grow steadily. According to the special situation that the planting of this year is generally late and soil moisture is better, it can be divided into the following types of management: First, returning to the middle-aged population (less than 600,000 plants per acre) in the wheat field (or middle and low-yielding fields), the young plants can be planted for about 20 days after returning green, and then watered and top-dressed before the birth of the second spring of spring wheat. The amount of topdressing can be controlled at about 40% of the total amount of fertilizer in the spring. It is recommended to apply 7 kg of urea per acre in order to promote the growth of tillers and strive for panicles. The second fertilizer and water management will be carried out in the late jointing period (before and after birth of the 5th to 6th leaves of spring students). The amount of top dressing is about 60% of the total amount of topdressing in the spring, and the recommended amount of fertilizer is about 10 kg of urea per acre, so as to promote grain weight and improve grain quality. The second is the returning green population in the wheat field (or high-yield wheat field) with more than 600,000 plants per acre, and the high-yielding wheat field with good soil moisture. It may postpone the first fertilizer season in spring, and the seedlings will be grown for about 40 days until the late jointing of wheat (Cang Shengdi 5 to 6 leaves before and after birth) followed by watering topdressing, the amount of fertilizer planned in the spring can be applied once in this period, the recommended fertilizer application amount is 15~20 kg per mu. This will not only extend seedling height, properly control tillering, reduce the length of the internodes of the base, promote sturdy stalks, prevent late lodging, but also save the cost of watering once, and also promote large panicles and large grains, and improve quality. The third is for the late sowing, the basic seedlings are too large (more than 350,000 per acre), winter wheat fields without delivery, do not rush to water in the spring and fertilize, in order to protect the temperature in the early spring. The first time the spring water and fertilizer management can be postponed in the early jointing period (before and after the fourth spring leaf birth, floret differentiation period), the amount of topdressing accounts for about 80% of the planned amount of fertilization in the spring, and the rest of the fertilizer is followed by flowering till the early filling stage. Fourth, for some wheat fields with high density and strong growth, or higher varieties of plants, besides mastering the regulation of fertilizers and waters, they can also be chemically regulated, and appropriate application of plant growth retardation during the period of birth (before and after birth of the third spring leaf). Agents (such as Zhuang Fengan) control the growth of plants, shorten the internodes of the base, reduce plant height, and prevent lodging. For example, the current application of more production is 20% of Zhuangfengan EC, the amount of 30 to 40 ml per mu, the water spray of 30 to 40 kilograms. Special attention should be paid to grasping the spraying period. It is unfavorable to use it too early or too late. At the same time, it is necessary to pay attention to a reasonable amount and spray it evenly to prevent phytotoxicity. 三ã€Foliar spray fertilizer to grasp time The best application time of foliar spraying fertilizer is from wheat heading to grain filling stage. Foliage spraying is recommended to use potassium dihydrogen phosphate or urea solution, with 0.5 to 1 kg per acre, evenly spraying water to 40 to 50 kg. At the same time, it is best to spray after 4 o'clock on the sunny day to avoid burning the leaves and to help the leaves absorb nutrients. Conditional all kinds of wheat can be sprayed fertilizer. Artificial Sweeteners
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