Analysis of wheat seedling situation in some areas of China in late February 2005

Introduction: according to the data analysis of the agricultural meteorological ten day report provided by the agricultural meteorological observation stations in Henan Province, the average temperature of Zhumadian in this ten day period is only 1 ℃ higher than that in the same period of the whole year, and other places are close to or 1-3 ℃ lower than that in the same period of the whole year; the precipitation is more than 60-90% lower than that in the same period of the whole year; the sunshine hours are close to or 5-32 hours less than that in the same period of the whole year In ten days, except the winter wheat in the northern part of Henan, the western mountain area and the eastern part of Henan is still in the overwintering period, other places have gradually entered the rejuvenation period, the temperature is normal slightly lower, the light is normal, the soil moisture is good, which is basically conducive to the rejuvenation growth of winter wheat There is no obvious meteorological disaster In ten days, except the winter wheat in the north, West and east of Henan is still in the overwintering period, other regions have gradually entered the rejuvenation period, and most counties (cities) are close to the same period of the year or 5-15 days later in the development period The average temperature of most wheat areas in ten days is 1-3 ℃ lower than that in the same period of the whole year Although the weather continues to be cold, it will not freeze the wheat, but it will delay the green growth of winter wheat There is a small amount of precipitation in wheat area, but the evaporation of soil moisture is less in winter At present, the soil moisture in most areas of eastern and southern Henan is more than 80%, and the soil moisture is better There was enough light in the middle and late ten days, which ended the continuous low temperature and low light weather for ten days, which was more favorable for the green growth of winter wheat According to the analysis of the latest remote sensing seedling monitoring results, the seedling situation in the whole province is better than that in the earlier stage, among which the proportion of first-class seedlings is 45%, the proportion of second-class seedlings is 32%, and the proportion of third-class seedlings is 22% In ten days, the temperature is still low, and the sunshine is less in the southwest; the precipitation is mainly distributed in the north, and there is basically no precipitation in the south The heat condition was poor, the wheat revived late, and the temperature in the southwest was low The soil moisture content is good, and there is no drought Most of the winter wheat in the whole province is still in the overwintering period in this ten day, and the wheat in the south of Handan began to turn green, later than all the year round The average temperature in ten days in wheat area is - 3 ~ 1 ℃, which is 1 ~ 3 ℃ lower than that in the whole year The temperature rises slowly, which is unfavorable for the winter wheat to rejuvenate, and the wheat rejuvenate in most wheat areas is delayed In this ten day period, there was a rainy and snowy weather process in Anhui Province from 23 to 25, and the rest of the time was mainly sunny Ten day average temperature: 3-5 ℃ to the north of Hefei, 5-7 ℃ to the South; 1 ℃ lower in some areas along the Huaihe River and Dabie Mountains, and nearly all year round in most other areas of the province Ten day precipitation: 10-15mm in the east of Jiangnan along the river, 0-10 mm in other areas; 40-90% less in the whole province Ten day rainy day: one day in the north of Huaihe River and along the middle of Huaihe River, four to five days in the south of Huangshan Mountain, and two to four days in most other areas Ten day sunshine hours: about 50 hours along Huaibei and East Anhui, more than 30 hours south of Huangshan, less than 30-40 hours in most other areas, nearly all year round In this ten day period, winter wheat in Huaibei area along the Huaihe River in Anhui Province started to turn green one after another and entered the stage of tillering and growing, while winter wheat in Jianghuai area was also in the stage of spring growing Due to the long-term process of low temperature, continuous rain and snow in winter, the spring development of overwintering crops in this year is about 10 days later than that in the same period of previous years, and the development period is generally delayed In this ten day, the temperature and sunshine are basically normal, the precipitation is obviously less, and the sunny weather is the main one, which reduces the long-term over wet state of the field soil, which is very beneficial to promote the spring Changchun development of crops, promote the weak to strong and field management in spring In this ten day period, the temperature of the whole province is on the low side, and the precipitation and light are on the low side In ten days, the wheat in southwest of Shandong Province entered the rejuvenation period, and the wheat in other areas was still in the overwintering period At present, the moisture content in most areas is suitable, which is beneficial to the growth of wheat In ten days, except for the southwest region of Shandong Province, the wheat in other regions is still in the overwintering period The development period is about 10 days later than that of the whole year The accumulated temperature of growth is 551-950 ℃, and most regions are 19-266 ℃ higher than that of the whole year According to the analysis of the measured soil moisture data on February 28, most of the current farmland soil moisture is more than 80%, and the soil moisture is suitable, which is conducive to wheat rejuvenation and spring ploughing for sowing In the later stage, after the temperature rises, all regions should carry out classified management according to different seedling conditions and the conditions of the seedling When thawing the wheat field, especially the long wheat field with the phenomenon of de fertilization, it is necessary to hoe and conserve the moisture in time, and make up for the green manure; for the wheat field with better moisture content, the green water can be properly poured late or not For the wheat fields with no water, poor soil moisture, few tillers before winter and insufficient population, we should put more fertilizer and water on them to promote the early emergence, rapid growth and weak to strong growth of wheat seedlings Pay attention to the weather change at any time, pay attention to the canopy coverage and reinforcement, and take measures such as heat preservation, brightening and moisture reduction in time to prevent crops from freezing or disease In this ten day period, the temperature of the whole province is generally on the high side, with less precipitation and more sunshine Within ten days, winter wheat in some counties (cities) in the South began to return to green, but most of the other counties (cities) were still in the period of stopping growth The precipitation in wheat area is less, but the temperature is higher and the moisture content is better, which is more favorable for the preparation of winter wheat to return to green In this ten days, winter wheat in some counties (cities) in the south of Shanxi Province has begun to turn green The accumulated temperature of wheat area ≥ 0 ℃ is between 359-732 ℃, except that Jiexiu, Fenyang, Jixian, Salt Lake area, Linyi and Ruicheng are 11-102 ℃ less than the same period of previous years, and most other counties (cities) are 11-140 ℃ more The precipitation is less, but the precipitation before is more, so the moisture content is better, and the temperature is higher, which is more favorable for winter wheat to return to green In this ten day period, the whole province is mainly sunny, with less precipitation, more sunshine, normal temperature and no agrometeorological disaster 1 Main weather process: there is no strong cold air impact in this ten day period in our province, and sporadic light rain fell in a few counties and cities from 26 to 28 2 Ten day average temperature: 5.0-6.5 ℃ in the north and 6.0-7.2 ℃ in the South; compared with the same period of the previous years, the temperature in Southwest Hubei is 0.2-0.7 ℃ higher and that in other areas is 0.1-0.7 ℃ The extreme lowest temperature in ten days is - 1.5-0.5 ℃ in the South and - 3.3-1.5 ℃ in the north, most of which occurs on the 21st-22nd 3 Precipitation in ten days: 1-7mm in the south, no precipitation in the north 4 Soil moisture: the relative humidity of 10-20cm deep soil is 80-95% This ten day, winter wheat in the province is in jointing stage The temperature began to rise, winter wheat has entered the development stage from the growth stage, the meteorological conditions are normal, no agrometeorological disasters Within ten days, the whole province's triticale is in the rejuvenated period, and its growth period is more than 5 days later than that of the whole year Due to the continuous lack of rain and light from late January to mid February, the soil moisture in the field has been in a state of over saturation for a long time The root system of overwintering wheat has poor growth, shallow rooting, early senescence in the later period and heavy potential lodging In this ten day period, the rain is less and the light is sufficient, which is conducive to the field waterlogging and the wheat rejuvenation