After Lidong, frequent cold air activities across the country will have a great impact on vegetable production. Vegetable production is relatively "fragile". Sudden cooling, frost, heavy rain and other disasters often lead to the annihilation of vegetables in simple sheds in one season. In the face of various disasters, how can we plan ahead and reduce losses? Now bring some countermeasures and successful experience of the production line to provide reference for growers.
1. The key points of the management of cooling and frost prevention and control
According to the weather forecast, before the arrival of temperature drop or late frost, if the cold shed and open field vegetables have not been planted, the vegetable seedlings shall be centralized to increase the temperature and the planting shall be postponed for 1 to 2 days. For fruit and leafy vegetables that have been planted in the shed, water and fertilize temporarily. Erection of straw curtains. Conditional vegetable growers can temporarily erect 1.2-meter-high grass curtains around the shed, and set up two-membrane, three-membrane or mulch film for heat preservation. Increase the temperature in the shed. If the temperature drops below 0°C suddenly, you need to ignite the heating block in the shed in advance, which can quickly increase the temperature in the shed by 3 to 5°C and keep it for 2 to 4 hours. The heating block is generally ignited at 3:00 in the morning when the night temperature begins to drop, and 3 to 5 blocks per acre are ignited according to the heating demand. Spray the potion. Foliar sprays of biostimulants such as amino acid + humic acid can enhance the cold-resistant activity of the leaf surface.
Treatment measures
After the weather is clear, open the air outlet of the greenhouse in time and adopt low temperature management to avoid tissue damage caused by excessive temperature changes.
Immediately spray the integrated amino acid magnesium calcium water solution (amino acid content 180g/L, calcium 20g/L, magnesium 10g/L) 600 times solution to the vegetables, 30～45L per mu, and then spray again after 5 days . Spraying highly active free amino acids is beneficial to the recovery of leaf cell tissues and alleviates freezing damage.
2. Look here for measures to prevent waterlogging of vegetables in the shed
Precaution
Pay attention to the weather forecast at any time, and prepare for flood drainage in advance if there is a rainstorm warning.
Using deep loosening + deep turning technology. Before winter, use a rotary tiller to deep loose the soil more than 40 cm to form a "rat passage" drainage ditch at the bottom of the deep plough. Dig drainage ditches in advance, prepare generators, pumps, drainage pipes and other drainage equipment.
The shed film is deeply buried and bent and pressed. When the shed film is pressed, leave an extra 50 cm of the empty film, dig a trench to bury 40 cm deep, and then spread the shed film 10 cm upwards after the trench reaches the bottom, and finally fill it with soil compaction. This can prevent rainstorm water from flushing through the bottom of the shed film to enter the shed. Pay attention to check whether the shed film or scaffolding is broken or cracked at any time, and repair it in advance.
Prevent disease. After planting, irrigate once with 400 times solution of 68% metalaxyl·manganese-zinc water dispersible granules to prevent stem base rot and Phytophthora root rot, block the ground and block soil transmission, and prevent diseases caused by standing water after rain . This is also one of the steps of the technical plan for the health protection of facility vegetables.
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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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