In winter, it is snowy and cloudy, and the light in the vegetable greenhouse is weak and the temperature is low, which has become a key factor affecting the growth of vegetables. Especially in the past week, a large range of overcast, rainy, and foggy weather appeared in North China, causing yellow leaves, dry tips, growth points to rot, and cucumber downy mildew, blight, and wilting Disease, flow gum, loquat root and other bacterial diseases; peppers, sweet peppers, eggplants, tomatoes, etc. appear flowering, fruit falling and blight, gray mold and so on.
In response to these problems, how should our vegetable farmers respond?
1. Keep seedlings for vegetable crops in existing greenhouses
As long as the temperature in the greenhouse reaches above 18 ° C during the day, ventilation is performed for a short time (about 20 minutes), and the leaves can be sprayed without dew. Organic silicon must be added to improve the absorption and utilization of pesticides. Take cucumber and tomato as an example, to prevent downy mildew, blight, gray mold, spray 60% Baxter + 5% Metosin + 72% agricultural streptomycin, and use 5% chlorothalonil every 2-3 days Clear aerosol or 10% Sukeling aerosol, fumigation at night to reduce the incidence and development of disease.
2. Regulate growth and control diseases
Do not water the crops that need to be watered in cloudy and rainy days. Spray foliar fertilizers to supplement the nutrients. Water the plants after sunny days. Properly thin out the cucumbers that form flower heads. Proper removal requires taking the cleaned leaves out of the room and spraying or fumigating the drugs in time to reduce the incidence of wounds and aggravated diseases caused by artificial removal of the leaves.
3. Management after continuous rainy and foggy days and sunny days
Root root phenomenon will occur in continuous rainy and foggy days for more than 5-7 days. In some areas, continuous rainy and foggy days have lasted for more than half a month. Most crop root systems have different levels of rust roots and almost no white roots that absorb nutrients. If semi-semi-semi-smooth weather causes the temperature to gradually rise, the damage to the seedlings will be less, and if there is a sudden sunny day, corresponding measures must be taken.
①When the indoor temperature rises to 23 ° C, ventilation will start, and the snoring of the leaves can be sprayed with sugar + vinegar (50 grams each) to be diluted 150 times, or sprayed with foliar fertilizer and sugar to increase the humidity of the air to slow down the snoring phenomenon. When the temperature rises above 26 ° C, snoring can be returned to the grasshopper, covering 2/3 of the shed. When the seedlings return to normal, the grasshopper can be rolled up in time. On the second day, observe the performance of the seedlings. If there is still snoring, spray chlorothalonil + streptomycin + brassinolide to reduce disease occurrence and promote seedling rooting;
② In the case of seedlings that need watering, suddenly do not water it on a sunny day, take the previous measures, when the 10cm ground temperature rises above 16 ° C, then water the water and try to raise the ground temperature as much as possible.
③ Raise the ground temperature: As long as the seedlings do not snore after a sunny day, a small wind is blown at about 23 ° C in the morning. When the temperature drops 1.5-2 ° C, the air outlet is closed. When it rises above 28 ° C, ventilate again. If it is ventilated at 23 ° C in the morning on a sunny day, the temperature will only drop by 1-1.5 ° C, and it will rise soon after a short period of time. You do not need to close the air outlet, but the air volume will increase when the temperature reaches 30 ° C at noon. In the afternoon, when the temperature drops to 25 ° C, the air vent should be closed. If the temperature rises 1-2 ° C, it will help raise the ground temperature, store heat, and help root growth.
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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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