The asparagus planted in Shan County of Shandong Province in 2007 was dead in a large area from September to October. It was seriously deficient in seedlings and affected the yield in the spring of 2008, causing many vegetable farmers to have a hard time. In order to prevent such a recurrence, attention should be paid in the future. The reason for dead asparagus is as follows: 1. Asparagus-like light, from September to October in 2007, coincided with the vigorous growth of the asparagus on the ground and the accumulation of nutrients, laying the groundwork for high yields in the following year. It suddenly encountered many years of continuous rainy weather, and the light was severely deficient, resulting in the stagnation of asparagus growth and nutrition. Accumulation is reduced, and the resilience is greatly reduced. 2. Asparagus originates in the Eastern Mediterranean and Asia Minor regions of the Mediterranean, where the climate is arid and less rainy, coupled with the developed root system of asparagus, the above-ground leaves are degraded, and the metamorphosed stems – small and needle-like, with little evapotranspiration, are very tolerant to drought. Impatient. The accumulation of water in the fields for a few days will lead to root rot and death. Asparagus grows continuously for many years, and the land cannot be ploughed. Manual harvesting, frequent pressing, and heavy application of chemical fertilizers cause damage to the soil structure and severe soil compaction. In particular, soil permeability under 20 cm is extremely poor. This not only affects the growth and development of the root system, weakens the absorption performance, and reduces the resistance of the plant. After raining and watering, the water cannot seep into the ground, and water accumulates on the surface for a long time, which is easy to cause damage. Root rotten plants have occurred. Because the water cannot seep into the ground, the surface water quickly evaporates and must be irrigated several times. This not only increases the number of water users but also increases the chance of damage. In this case, continuous rains from September to October in 2007 are the main reason for the large number of dead plants of asparagus. 3. Asparagus is a harvest season in spring and early summer, and people's management is more sophisticated. In autumn, the above-ground shoots are growing vigorously and the management is neglected. With the large amount of nitrogen fertilizer applied, the density of the aerial parts is greater, which affects the ventilation and light transmission. This not only reduces the plant's resistance to stress, but also provides favorable conditions for the occurrence of diseases. condition. 4. In continuous rainy weather, the humidity of the air is high, which makes the transpiration of the leaves nearly stagnate, which seriously reduces the water absorption of the roots. Nitrogen, phosphorus, potassium, and trace elements such as zinc, boron, and calcium that are carried to the leaves through the water are also greatly increased. As a result, the symptoms of nutrient deficiency, such as yellowing, scorching, and chlorosis, clearly occur, resulting in reduced resistance of plants and creating conditions for the occurrence of diseases. 5. In the humid air environment, diseases such as brown spot, rust, stem blight, and wilt disease occur seriously. The majority of people cannot spray the medicine because they often rain, which eases the prevention and treatment of the disease and exacerbates the damage of the disease. Under the combined effects of the above-mentioned factors, asparagus is dry and yellow, and the entire plant dies. The following measures are taken to prevent dead asparagus: 1. In early spring, combine watering and applying soil conditioners – no deep plowing, 200-400 grams per mu, to promote loose and transparent soil 30-50 cm deep. This will not only be beneficial to the growth and development of roots, enhance the absorption capacity, but also increase the water storage capacity of the soil. After rain or watering, the water will quickly seep into the lower layers of the soil and there will be no water on the surface of the soil to reduce the occurrence of earthworm damage. In drought, the soil There is water storage in the lower level, which will not cause drought damage, reducing the number of watering and avoiding the disadvantages that must be caused by watering in continuous rainy days. 2. Continuous rainy days, the root system can not normally absorb potassium, calcium, magnesium, iron, zinc and other metal elements, it can not use the soil fertilizer measures, but should be applied once every 5-10 days outside the fertilizer element, the concentration of about 0.3% . Foliar fertilization solves the problem of fertilizer element deficiency. 3. On cloudy and rainy days, a plant growth regulator, natural alfalfa Shuofeng 481, should be sprayed every 10 to 20 days to promote photosynthesis, improve the nutritional production of asparagus, and improve resilience. 4. Top dressing in summer should be applied with N, P, K, and no partial nitrogen fertilizer should be applied to avoid excessive growth. Plants that thrive in overgrowth should be properly cut off some of the weak, sick branches, improve ventilation and light conditions, reduce the humidity in the field. 5. Pay attention to timely drainage in the rainy season to avoid damage. 6. Rainy days should also be sprayed in time to prevent the occurrence of diseases. For asparagus rust, stem blight, brown spot, blight (fly blight), crown rot, anthracnose, stalk rot, root rot and other diseases should be appropriately increased phosphorus and potassium fertilizer; harvested along the surface of the cut, Deeply buried or burned the old and sick remnants, and paid attention to the removal of weeds; timely drainage after the rain, reducing soil moisture. 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Causes and Prevention of Large Number of Asparagus Dead Plants
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