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Late buckwheat refers to the wheat that was planted later than the winter in the Huaihuai North area. Late buckwheat usually has a small ear, small ear, light grain, and low yield. The yield per mu is generally 100-150 kg. First, the main reason for low yield 1, Fengyang County, autumn seedings often encounter continuous rain and autumn drought, resulting in delays in autumn species, which caused by cloudy rain late seeding rate is high. For example, in 2003, China suffered floods and floods, flooded areas along Huaihe River were unable to fall into the water and sowing, and in some places, the wheat planting period was postponed until the end of November to early December, and part of the field wheat could not normally emerge before planting. . Farmers: "October, a shot of a gun," refers to the lunar calendar sowing wheat in October, there can only be a single stalk. According to the theory of cultivation, there are fewer tillers before late buckwheat, and it is basically impossible to carry quail over winter. After the late buckwheat returned to green after the year, most of the tillers that occurred were ineffective tillers. Even if there were some tillers and spikes, the panicles were small and the number of grains per panicle was small, so the yield was low. 2, poor quality of soil preparation, wheat seedlings grow weak, not strong seedlings overwintering. Late buckwheat is mostly rice buckwheat, if you encounter adverse weather effects when sowing, poor soil moisture conditions, more rainy year, soil heavy weight; drought years, soil moisture content is less, the soil is not easy to smash, resulting in uneven sowing depth, The phenomenon of cluster seeds, dew-seeds, and deep-seeds is widespread. The seedlings are not neat, and the seedlings are cut short. The roots of wheat seedlings are poorly growing, and the seedlings are small and the seedlings are vulnerable to freezing injury. In addition, due to climate, public opinion, labor, etc. during the sowing of late buckwheat. , The wheat field ditching is not timely, "three ditch" (ditch ditch, waist ditch, ditch ditch) is not complete, small ditch, shallow ditch, drainage and irrigation is not easy, susceptible to drought, stains and pests and diseases. 3, improper selection of varieties. In recent years, due to the large-scale use of new wheat varieties, many farmers do not understand the nature of the varieties, and the concept of spring and semi-winter breeds is vague. The sowing date and broadcast volume are uncertain, and the field management is not proper. 4. Farmers who grow late buckwheat generally increase the basic seedlings by increasing the amount of sowing. The sowing rate per acre is generally more than 20 kilograms, even reaching 25-30 kilograms. The number of stems per acre (actually no grasshoppers) was 300,000 to 400,000 years ago. The climate and cultivation conditions were suitable for the year. The number of stems and stems soared, breaking through 1 million per acre, resulting in groups and individuals, aboveground and underground parts, and nutrition. Uncoordinated growth and reproductive growth cannot achieve the cultivation goals of strong culms and large spikes. 5, fertilization is unreasonable. The method of fertilization with "one shelled bombardment" was used, namely, 50 kg of Ammonite "fertilizer" (ammonium bicarbonate), 50 kg of phosphate fertilizer, and 15-20 kg of topdressing urea before and after the Spring Festival. Neglecting the application of farmyard manure and potash fertilizer, most farmers have no habit of applying fertilizers outside the roots. 6, late buckwheat due to poor growth of groups and individuals and the relative lag behind the cultivation and management measures, wheat sheath blight, head blight, ear blast and wheat spiders tend to occur. Due to the inadequacy of the winter, rice bran has seen serious damage to Maiyin, and it often appears that there is not much grass. Second, the solution to the solution 1, the disastrous weather during the autumn species should be prepared to prepare as soon as possible, such as rush to harvest; according to the weather forecast and cultivation requirements, grasp the rice paddy field last irrigation and drainage time in paddy fields, after the seedlings of wheat Create a good sensation. 2. Improve production conditions and eliminate waterlogging. Eliminating waterlogging is particularly important for low-lying rice fields. Rice buckwheat to avoid land preparation, the width of 3-5 meters is appropriate. Open a good "three ditch" to reduce the groundwater level. The sulcus generally reaches 7-10 cm below the plough base to form a deep trench sorghum. The gutters and gutters should be deeper than the sulcus, so that the sulcus can communicate with each other. 3, the late buckwheat should use early spring varieties with resistance to disease resistance, with the use of semi-winter varieties. Spring wheat varieties used Yumai 18, Zhengmai 9023, Yangmai 158, etc.; semi-winter varieties used Wanmai 19, Xinmai 9, Wenmai 4, Wenmai 6, etc. 4, using less no-tillage technology, improve the quality of sowing. The most suitable method for no-tillage cultivation in China is organic drilling and rotary seeder drilling. Rice stubble land is less to farm wheat, save labor, save time, save costs, and the effect of increasing production is obvious. In severe years of locust plague, if it is really necessary to sow wheat, water ploughs and sowing methods can be adopted. In drought-stricken years, watering should be advanced in advance. 5, from the point of view of cultivation analysis, late buckwheat should be appropriately increased sowing volume, in order to make up for the lack of individual wheat growth, but should not be excessive to increase the amount of sowing. Late buckwheat leaves enough wheat to stay, and the germination rate of wheat seeds should reach more than 85%. Under the premise of fine soil preparation, rice buckwheat is 12.5-15 kilograms per acre, and 200,000-250,000 per acre. 6, a reasonable fertilization. Basal fertilizers should not be used for large-scale application of quick-acting fertilizers, and organic and inorganic fertilizers should be used. If organic fertilizer is used as the base fertilizer during the planting period, farmyard manure should be applied in the winter as a wax fertilizer, and emphasis should be placed on the use of joint fertilizers from the beginning. It is combined with spraying one spray, three sprays, and spraying 0.2-0.3% of potassium dihydrogen phosphate and 1-2%. Urea solution to prevent late defertilization premature aging. 7, late buckwheat in the spring attention to control wheat sheath blight and wheat spiders. Heading and flowering period, focusing on prevention of wheat scab and prevention and control of panicle blast, and good grasp of wheat "one spray and three defenses." Chemical weeding can be combined with autumn and spring addition. Rice buckwheat key control to see aphrodisiac, three-leaf mu with 6.9% of the hummer cream 40-50 ml, 30 kg of water evenly spray. 8, special disaster years and special gargle, if the wheat can not normally emerge after sowing years ago, it is recommended not to grow wheat, can be left for spring gargle, planting "five drought" crops.