After the seedlings are sown, the quality of the seed is poor, the bacteria is invaded, the water is too little or too little, and the temperature is low for a long time. The result is that the seed is rotten, the young shoots are dry, and the seedlings do not emerge for a long time. Preventive measures: seed germination experiments, the use of high seed germination rate, spare seeds must be disinfected before sowing, reasonable control of temperature and humidity, to ensure the seedlings full Qi Qi.
Although the seeds of the second “top shell†seedlings can germinate and sprout, the seed coat does not fall off after excavation, and the cotyledons are sandwiched to form the “top shell†seedlings, also called “hats†seedlings, which seriously affect the photosynthesis and growth of the seedlings. It is easy to form weak seedlings. This phenomenon is most common in melon crops. First, the seeds were too shallow, the topsoil was easily dried, the seed coats dried hard, and the second was that the seeds were not mature enough or old; the third was the premature release of the film. 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.
The three defenses “high-legged†seedlings are also called long seedlings. The fields are characterized by fine stems, long internodes, few fibrous roots, thin leaves, light color, and poor resistance. It is not easy to survive after planting. Mainly due to lack of light, the density is too large, the night temperature is too high, too much nitrogen fertilizer, even rainy days or glass, Plastic Film and other dust caused by too much. Preventive measures: control of fertilizer and water, timely ventilation and light transmission, increase the light intensity and light receiving time as much as possible, and time seedling weeding, in case of rainy days, should be opened as usual insulation cover to prevent leggy.
The four “anti-aging†seedlings are also known as 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, young seedlings are inhibited from the growth and development of autumn seedlings. Preventive measures; reasonable control of temperature and humidity, nursery period should not be too long, found that aging seedlings, take timely measures.
The long-term low temperature, excessive humidity, excessive fertilization, and improper fertilization methods may cause rooting and rooting of the 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.
Six poison gas pollution membranes were improperly selected, some were toxic, and many kinds of toxic gases were volatilized under high temperature conditions. The seedlings were contaminated and symptoms of poisoning occurred. The leaves turned green and yellow, and soon turned white and dry. Cruciferous seedlings are the most sensitive, such as cauliflower, rape, cabbage, etc. Even if there are trace toxic gases, the cotyledons will turn white and even die. Therefore, cruciferous vegetable seedlings can be used as indicator plants for testing whether the film is toxic or not; improper application of fertilizer can also produce toxic gas, contaminate seedlings, tomato, pepper, cabbage and other seedlings are contaminated, the leaves appear round or diamond white "smoke spots" , gradually withered off; eggplant, pumpkin, carrots and other seedlings suffer damage, there will be brown "smoke spots", and gradually withered. In order to prevent the film from producing poisonous gas to contaminate the seedlings, when selecting seedlings, qualified agricultural special film must be used. If abnormal film is found to be toxic due to poisonous film, replace the film in time or increase the ventilation during the day to release toxic gas. The seedbed should be fully cooked. Organic fertilizers, especially nitrogen fertilizers, cannot be dragged in too much. Poisoning was found. During the day, ventilation was increased and harmful gases were eliminated.
There are many reasons for the cold damage caused by the seven flood-proof seedlings. The seedlings have been relatively warm during the breeding period. Suddenly, the cold flow suddenly occurs. The seedlings are often prone to freezing. After a cloudy day, rain and snow, the weather suddenly turns fine, the temperature in the shed rapidly increases, and the relative humidity rapidly increases. Falling, seedling tissue dehydration and dry death; continuous cloudy, rain and snow days, the sun is weak, the temperature is low, the cold resistance of the seedlings weakened, prone to frost damage; nursery protection facilities closed lax, rain and snow fell from the gap on the vegetable seedlings , so that the seedlings partially frozen; morning condensation on the film of water droplets, fell on the seedlings, will also make the seedlings partially frozen; when the seedlings top to the film, the top of the young shoots and leaves vulnerable to freezing damage; ventilation, seedbed The temperature is high, the outside temperature is low, and the air is suddenly released. The seedlings are also susceptible to freezing, commonly known as "flashing 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. Preventive measures: increase the light intensity, cultivate strong seedlings, cultivating seedlings at low temperature, control humidity, reasonably prepare bed soil, protect facilities strictly, and prepare for cold insulation prior to cold.
Eight pest control pests seed disinfection and soil treatment before sowing, beware of damping-off disease, blight, early blight, gray mold and other seedling disease, while preventing the invasion of underground pests, aphids, migratory locusts, spider mites, Prevention and control measures, focusing on agricultural and biological control, limited use of chemical control, is strictly prohibited using high toxicity, high residue pesticides.
Silage Wrap Film ,Width 750mm, Thickness 25um, Length 1500m,UV resistance 12-24months.
This kind of 750 Silage Wrap films can be produced with black, white and green colour,which are applied in MC-HALE,CLAAS and GOWELL package machine for round and square bales. This 750 silage wrap film is very popular for storage of silage and haylage getting the air out and do all that is possible to keep it out until you are due to feed it out,which have very high efficiency and very good effect on silage storage. The main market of 750 silage Stretch Film is Australia,New Zealand,Ireland,Germany and UK.
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