Pouring frozen water in a timely manner is an important measure to ensure safe winter wheat. It is particularly important to properly pour wheat frozen water. How to pour the frozen wheat water first time should be appropriate, but also according to the weather, field sensation, but also see seedlings.
Timely watering benefits: 1. Soil can be soiled, especially in recent years, most of the wheat fields are front glutinous maize straw returning, resulting in false soil preparation. Pouring frozen water can greatly improve the non-realization of this field soil. It is also conducive to freezing and thawing and weathering ash, to make up for cracks and eliminate overwintering pests; 2. To ensure proper water supply for winter wheat, to consolidate tillering before winter, to promote new births, and to combine winter water use with spring drought prevention. 3. To increase the thermal conductivity of the soil can effectively reduce the amplitude of the temperature in the field, to prevent the freezing and chilling of the dead seedlings due to the dramatic temperature rise and fall; Fourth is to maintain alkalinity and reduce the occurrence of salinization in the soil. In addition, the winter irrigation also has the effect of promoting microbial activity, accelerating the decomposition of organic fertilizers, and satisfying the growth of wheat after turning green.
Watering time: 1. Look at the weather. In the autumn and winter rains, the winter cold drought is the best. Winter irrigation is suitable when the daily average temperature is stable at about 3°C. It is too early, the temperature is high and the evaporation is strong, it can not play the role of water retention and water retention, and it will cause the legume growers and even the jointing of the winter before the winter, and the freezing injury. Severe; too late, the temperature is low, unfavorable moisture infiltration, the ground easy to form ice shells. The farmer said: "It is not necessary to freeze, winter irrigation is too early, night is too late, irrigation is good; only cold, winter irrigation is late," which is scientifically reasonable.
2. Watch the field sensation. Insufficient soil moisture content, soil moisture content in 5-20 cm soil below 13%, loam below 15%, clay below 17%, or soil relative humidity below 60%, the need for winter freezing, higher than the above indicators Slow-irrigation or no-irrigation; buckwheat glutinous rice ground is wet, the ground temperature is low, flooding should not be flooded, so as to avoid red, yellow, or even dead seedlings, spray, cellar irrigation or sprinkling can be used to facilitate Warming and keeping seedlings.
3. See seedlings. Wheat early sorghum seedlings generally have better bottom tillers, which can be slow or no irrigation, flooding, late buckwheat sowing, short growing period before winter, lack of effective accumulated temperature, multiple single seedlings, in order to make full use of the effective accumulated temperature of early winter cold and warm gap, To facilitate the delivery of pan-dunk, in addition to over-arid fields, it is usually better to not use irrigation, but it is appropriate to return to Qingshui early.
The quality of winter irrigation is different and the effect is different. To prevent flooding caused by flooding, pressure, drowning silt, damage wheat seedlings; and after the winter irrigation timely sparse planing to prevent cracks and cracks, causing root dead seedlings. Http://Content/7f84ab68-77b4-465b-834c-7b772c599b09?cType=2
In China, nervous system drugs are also one of the drugs with the most rapid sales growth in recent years. In 2002, nervous system drugs occupied 5.9% of the entire pharmaceutical market share, and the total sales amount increased by 9.4%.
With the increasing trend of urbanization and aging, the elderly population in China has exceeded 120 million, and the incidence of geriatric diseases, especially mental diseases, is increasing year by year. With the increase of residents' income, the elderly's requirements for quality of life also increase. As a result, the demand for drugs to treat mental illnesses such as Alzheimer's has soared. In WHO drug classification, psychotropic drugs and nootropic drugs are grouped into one class. We briefly analyzed the development trend of this class of drugs through the clinical drug use data collected from more than 300 domestic key hospitals by Chinese Pharmaceutical Association.
The overall market size of this class of drugs is about 1.22 billion yuan, the consumption sum increased by 5.0% in 2002, but the sales quantity increased by 11.2%. The main reason why the consumption sum did not increase with the sales quantity is that several main varieties of this class of drugs, such as piracetam, cobalt bin amide and ginkgo biloba leaf, etc. In 2002, the price of selling units fell sharply due to bidding. Among these drugs, ginkgo biloba preparation occupies the largest market share, accounting for more than 1/3 of the market share, ganglioside ester and cobalt bin amide combined also occupy nearly 1/3 of the market share, piracetam and other "sitan" drugs occupy nearly 10% of the market share, the rest of the drugs occupy less than 5% of the market share. At present, more than 20 ginkgo leaf production enterprises, piracetam production enterprises more than 70, have entered the stage of price competition, profit repeatedly diluted.
In the first-line varieties, except ginkgo biloba leaves preparation maintained vigorous vitality, the growth of other varieties were weak, especially the traditional variety piracetam suffered from bidding
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