Vegetable Seedling Attention to "Six Preventions"
Vegetable seedlings are an important part of guaranteeing high yields and high yields. They are also the basis for early maturing, high yielding, and high quality of vegetables. Care must be taken to prevent the following situations from occurring during the nursery process. One can not prevent seedlings. After sowing, seed quality is poor, pathogenic bacteria infestation, excessive or too little water, long-term low temperature and other reasons, resulting in rotten seed, young shoots dry, long-term no seedlings. Preventive measures: seed germination test, the use of high seed germination rate, standby seeds must be disinfected before sowing, reasonable control of temperature and humidity, to ensure the seedlings full Qi Qi. Two anti-"top shell" seedlings. Although the seeds can germinate and emerge, but the seed coat does not fall off after exhumation, clamping the cotyledons, the formation of "top shell" seedlings, also known as "dim cap" seedlings, seriously affecting the photosynthesis and growth of seedlings, easy to form weak seedlings. This phenomenon is most common in melon crops. One reason is that sowing is too shallow, the topsoil is easy to dry, the seed coats dry and hard; second, the seed maturity is not enough or old; the third is to solve the film prematurely. Preventive measures: Fully dip the bottom water before sowing and keep the soil moist before emergence. The depth of sowing should be appropriate. When the topsoil has just emerged, it should be sprayed with water. Three anti-"aging" seedlings. Also called stiff seedlings, the seedlings grow slowly or stop, the seedlings are small, the roots are aged and rusted, the new roots are not long, the stems are dwarfed, the internodes are shortened, and the leaves are small and thick. Such as cucumber "flower topping" phenomenon is a typical aging seedlings. After such seedlings are planted, their growth and development are slow, affecting the yield and quality. Because the bed temperature is too low or the soil is seriously deficient in water, the young seedlings are inhibited from growing and developing. Preventive measures: reasonable control of temperature and humidity, nursery period should not be too long. Four defenses are roots and roots are burned. Long-term low temperature, excessive humidity, excessive fertilization, and improper fertilization methods can all cause the phenomenon of burning and rooting in seedlings. Roots generally rust, roots rot, no new roots, wilting seedlings; burning roots showed yellowing roots, not long new roots, but not rot, seedlings dwarf, slow growth, easy to aging. Preventive measures: Rational fertilization, proper control of moisture, and creation of suitable temperature and humidity conditions. Fifth, poison gas pollution. Some of the films are toxic. Under high temperature conditions, a variety of toxic gases are volatilized and the seedlings are contaminated. Symptoms of poisoning occur. The leaves turn green and turn yellow, quickly turning white and dry. Cruciferous seedlings are the most sensitive, such as cauliflower, rape, cabbage, etc. Even if there are trace amounts of toxic gases, the cotyledons will turn white and even die. Therefore, cruciferous vegetable seedlings can be used as indicator vegetables for testing whether the film is toxic. Inappropriate fertilization, such as organic fertilizers that are not fully decomposed, can also produce poisonous gas and endanger seedlings. In order to prevent the film from producing poisonous gas to contaminate the seedlings, when selecting seedlings, qualified agricultural film must be used. Once an abnormal state is found due to the toxic nature of the film, replace the film in time or increase ventilation during the day to release toxic gases. The seedbed should be fully decomposed organic fertilizer, in particular, the amount of nitrogen fertilizer applied can not be too much, found poisoning, timely increase ventilation during the day, discharge harmful gases. Six seedlings are frozen. There are many reasons for freezing injury. During the seedling raising period, the cold flow suddenly occurs, and the seedlings are easily chilled. After a cloudy day, rain, and snow days, the weather suddenly turns cloudy, the temperature in the shed rapidly rises, the relative humidity rapidly decreases, and the seedling tissue dehydrates and dies; In rain and snow days, the sun is weak, the temperature is low, the cold resistance of the seedlings is weakened, and it is prone to frost damage; the nursery facilities are not strict; the rain and snow fall from the gap to the vegetable seedlings, causing the seedlings to partially freeze; the water droplets that condense on the film in the morning, Falling on the seedlings will also make the seedlings partially frozen. When the seedlings are topped to the film, the shoots and leaves at the top are susceptible to freezing damage. When the seedlings are ventilated, the temperature inside the seedbed is high, the outside temperature is low, the air is suddenly released, and the seedlings are also susceptible to freezing. , commonly known as "flash seedlings." When the seedlings were frost-damaged, white and pale yellowish brown necrotic spots appeared on the leaves, or the edges of the leaves turned white, appearing as water-soaked, and gradually dried off. Mild cold injury, the symptoms are not obvious, but the decline in plant physiological function, prone to malformation and malformation. Prevention methods: increase the light intensity, cultivate strong seedlings, low-temperature refining seedlings, control of humidity, reasonable preparation of bed soil, protection facilities should be tight, before the cold weather comes, do a good job of cold insulation. Organic Isomalto-Oligosaccharide 900 (tapioca) Syrup High-Maltose Syrup,Prebiotic Corn Fiber Syrup,Fermentable Oligosaccharides Shandong Bailong Chuangyuan Bio-tech Co.,Ltd. Qingdao Branch , https://www.sdblcycn.com