The nursery should do "four defenses" in the early spring
Spring is the season for the recovery of all things, seedlings begin to grow rapidly, and the nursery has to do “four defenses†in early spring.
In the early spring, the climate is very changeable, and the seedlings are vulnerable to freezing injury. We must do a good job of antifreeze. 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.
Prevention of wetness and dampness is a fatal factor that affects the robust growth of seedlings. In spring and snowy areas and low-lying nurseries, if the soil moisture content is too large, not only the soil temperature will decrease, but also the ventilation will be poor, which will seriously affect the growth of roots, and some may even cause rot. 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.
Disease prevention and treatment The common diseases of spring seedlings include blight, root rot, stalk rot, anthracnose, etc., especially in the seedling stage, the occurrence of blight is more common and often results in the death of a large number of 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). You can also disinfect the soil before sowing or transplanting. Use 70% 3 kg of dexamethasone per acre and apply fine soil to the nursery. In the early stage of disease, 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, soak the seedlings for 10 minutes, dry after planting; also available 80% 402 antibiotic 2000 times, soaking for 5 hours; early onset, available 50% TB600 700 times Irrigation of the liquid.
Prevention of fertilizer and damage in the early spring sowing, cuttings and other methods of nursery nursery, Shiji fertilizer must be prohibited from applying without organic fertilizer, otherwise, the fertilizer is easy to cause burning in the fermentation of burning root. The seedlings that have just begun to grow in early spring need less fat. For fertility-reducing seedlings, fertilization should also be based on the principle of “never less, rather less concentrated†principle, followed by a small amount of thin liquid fertilizer (such as decomposed human excreta, etc.), and can not be over-concentrated fertilizer or Fertilizer to prevent burning roots.
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