Nursery early spring four defense technology
First, the anti-freeze injury As the saying goes: "Spring monkey face, changeful." In the early spring climate change, seedlings are vulnerable to frost damage, to do a good job of antifreeze work. For the seedlings planted on protected land, when the cold current comes, in addition to the insulation of the sealing film, the straw curtains shall be added to the sheds, and after the weather is fine, the grass curtains shall be promptly removed to receive the light and increase the temperature in the shed. Before and after noon at sunny and no-wind, depending on the temperature in the shed, suitable windows should be opened, ventilation should be reduced, and high temperature should be avoided. In addition, conditions can be applied to the surface of plant ash, not only can play a role in absorbing heat, but also increase the content of potassium in the soil, is conducive to the growth and development of seedlings.
2. Prevention of wetness and dampness is a deadly factor affecting the robust growth of seedlings. There is a saying in the industry: “Water is the life of seedlings, but it is a disease of seedlings, and water must be consumed.†Areas with high temperatures in spring and low-lying terrain In the nursery, once the soil moisture content is too large, not only the soil temperature is lowered, but also the ventilation is poor, which seriously affects the growth of the root system, and some of them even cause rot-root dead seedlings. Therefore, all drains and nursery drainage systems in the nursery must be thoroughly cleaned after the spring. In addition to removing all the loose dirt dropped in the ditch, the shallow ditch should be deepened again, so that the ditch can be unblocked, the inside and the outside can be lowered, the bright water can be discharged quickly, the dark water can drain off, and there is no water accumulation in the garden after the rain. Reduce the damage of Mingshui, shallow water and groundwater. Frequent shallow-tillage cultivating soil not only helps to reduce temperature and protect soil, but also enhances soil permeability and increases ground temperature.
Third, disease prevention Spring seedlings common diseases mainly include blight, root rot, stalk rot, anthrax, etc., especially in the seedling stage of blight occurs more commonly, often resulting in a large number of dead seedlings.
The control method is to sow seedlings in the early spring with 0.3% thiram or 50% dexon (with 0.3% of the seed weight). Soil disinfection can also be carried out before sowing or transplanting. For each mu, use 70% 3 kg of dexamethasone and mix the fine soil with the nursery. At the beginning of the disease, 200 times liquid of mycotoxin, 200 times liquid of root rot, and 200 times of 75% pentachloronitrobenzene can be used to irrigate the ward.
Root rot is also one of the important diseases of early spring seedlings. The bacteria lived in the soil and on sick bodies for winters, and they can also spend winter on seedlings. After the beginning of spring, the onset of the disease began. The roots of the fibrous roots began to grow. As the disease progressed, the vascular bundles were destroyed, causing the seedlings to wither and die. Control methods can be used 50% thiophanate-methyl 1000 times, soaking the base for 10 minutes, after drying and planting; also available 80% 402 antibacterial agent 2000 times, soaking for 5 hours; early onset, can be used 200 times mycotoxin, Root rot eliminate 200 times liquid, 50% retort special 700 times liquid to root.
Fourth, prevent fertilizer and damage in early spring sowing, cuttings and other methods of nursery nursery, Shiji fertilizer is strictly prohibited when applied without decomposition of organic fertilizer, otherwise, the fertilizer in the fermentation is easy to cause burning and burning root. The seedlings that have just begun to grow in the early spring need less fat. For fertilizers with severe fertility deficiency, fertilization should also be based on the principle of “never less, rather less concentratedâ€, followed by a small amount of thin liquid fertilizer (such as decomposed Human excrement, etc.), and do not apply excessive concentrated fertilizer or fertilizer to prevent root burning.
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