Different growth stages of green onions, due to different growth, the amount of fat fertilizer is not the same. Scallion from the sowing to harvest to go through 1 to 2 years, this stage is the period of vegetative growth. After flowering at low temperatures, flower buds begin to differentiate, and then flower seeds in long days. This stage is the period of reproductive growth. Therefore, the onion's life cycle is 2 to 3 years. During the period of vegetative growth, it can be divided into the period of germination, the period of seedlings, the growth of onion plants and the formation of scallions. Black Wolfberry Small Grains,Black Goji Berry Small Grains,Small Black Goji Berry,Samll Black Goji Berry Tea NINGXIA STARLIGHT FOOD TRADE CO.,LTD , https://www.starlightfood.com
Onion sprouts from the seeds to expose the radicles and grow to the first true leaves for germination. The growth of radicles and cotyledons is provided by the endosperm of the seeds, and nutrition is almost not required from the outside. However, timely supply of external nutrition in the final period is conducive to a smooth transition from the germination period to the seedling stage. Onion grows from the first true leaf to colonize the seedling stage. The autumn sow seedling period in the north is 8 to 10 months. In the seedling stage before the winter, the temperature is low, the growth is small, and the onion needs less fertilizer. In the case of applying the base fertilizer to the seedbed, generally no fertilization is needed, and more fertilization can easily cause the seedlings to grow too large to cause convulsions. Making the seedlings long and reducing the ability to overwinter, unfavorable to cultivate strong seeds before the winter. The criteria for onion seedlings and seedlings before winter are: the average plant height is about 10 centimeters; there are two true leaves and one heart leaf; the diameter of seedling bulb base does not exceed 0.3 centimeters; In order to ensure that the seedlings safely pass through the winter, they may be covered with 1 cm thick shredded horse dung, ash or fine rim fertilizer in the morning before and after the “big snowâ€. During the wintering season, green onions are dormant and their growth is extremely weak. From the turning green to the end of the seedling period, the seedlings grow vigorously. This period is as long as 80 to 100 days. It is a crucial period for cultivating strong seedlings. Suitable for planting seedlings, plant height 35 to 40 cm, diameter 1.3 to 1.5 cm, to prevent seedlings growers, need to artificially limit nutrient absorption, control their growth, and seedlings.
After welsh onion colonization, the original fibrous roots no longer continue to grow and soon decay, fresh roots begin to germinate after 4 to 5 days, the heart leaves begin to grow, the seedlings are in the recovery phase, and in the summer high temperature conditions, the slow seedlings are slow and growth is slow , Plant weight, plant height decreased without increase, less fertilizer absorption. As the weather gradually cools, the temperature difference between day and night increases, plant growth speeds up, light blue began to grow, and first stretched and then thickened. This period the maximum amount of fertilizer absorption, is the key period of fertilization, but also soil softening, the formation of winter onion production In the season, light blue yields accounted for almost 40% of the total plant growth. With the decrease of natural temperature, after the onion frost, the growth of the onion was stopped, the leaves and roots gradually became senescent, the amount of fertilizer was rapidly decreased, and the product and organs were formed. Until harvesting, Welsh onion mainly relied on the nutrients of the leaves to supply.
Weeping onions are good-looking crops. The physiological effects of major nutrients on Welsh onion are: nitrogen, the growth of Welsh onion requires more nitrogen, if there is insufficient nitrogen, not only a few leaves, small leaf area, but also the nutrients in the leaves Leaf sheaths are also stored and transported infrequently, which affects the yield and quality of false onion stalks. Green onions are very sensitive to the effects of nitrogen nutrition. The results of nitrogen, phosphorus, and potassium fertilizing effects of Welsh Onion by the Vegetable Research Institute of Shandong Academy of Agricultural Sciences show that nitrogen production is significantly reduced and potassium deficiency occurs during the period of slow seedling over summer and light blue rice growth on the basis of applying the same base fertilizer. The impact of phosphorus deficiency is lighter. When soil hydrolyzable nitrogen is lower than 60 mg/kg, nitrogen fertilizer has a significant increase in yield. For high-yield cultivation, the vigorous growth of green onions requires soil hydrolyzable nitrogen to be maintained at 80 to 100 mg/kg. Phosphorus, involved in the physiological activities of various parts of the plant, can promote the occurrence of new roots, enhance root vigor, expand the nutrient absorption area of ​​roots, and play an important role in cultivating strong seedlings and improving the cold resistance and yield of seedlings. On the scallion seedlings, bed soil phosphate deficiency, not only the seedling weight significantly lower than the general seedbed, and after planting, plant growth will also be seriously affected. When the soil available phosphorus content is less than 20 mg/kg and organic fertilizer is low, it is necessary to supplement the phosphate fertilizer. Potassium participates in the functional activities of green leaf photosynthesis and promotes the transport of carbohydrate enzymes, and is concentrated in important parts of meristem and metabolism. Potassium does not appear to have an adverse effect on the growth of seedlings, but potassium deficiency before or after pseudostem hypertrophy, or less potassium, affects yields. Therefore, onion farmers have the habit of applying wall soil and plant ash, and they are familiar with the production and quality of potassium on green onions. The importance of When the green onion plants enter the growth stage and the soil available potassium content is lower than 120 mg/kg, the application of potash fertilizer can increase the quality of pseudostem and yield per unit area. Calcium, Magnesium, Manganese, Boron, and Sulfur also play a role in the growth and quality of Welsh onion. In the case of adequate supply of N, P, and K fertilizers, the addition of calcium, magnesium, manganese, boron, and sulfur can promote Slightly thicker growth, higher yields and stronger taste.
According to the experimental study, for each 1,000 kilograms of scallion produced, about 2.7 to 3.0 kg of pure nitrogen, 0.5 to 1.2 kg of phosphorus pentoxide, and 3.3 to 4.0 kg of potassium oxide are required to be absorbed. The total amount of potassium absorbed is the highest, followed by nitrogen, and the least is phosphorus. . The absorption ratio of nitrogen, phosphorus, and potassium is 1:0.4:1.3. From the accumulation and absorption dynamics of nitrogen, phosphorus, and potassium, in mid-August, when the weather is cold, it is the peak season of scallion plant and scallion growing season. Nitrogen starts first, potassium bulges catches up, and phosphorus eases. . The absorption dynamics of nitrogen, phosphorus, and potassium are: nitrogen absorption, scallion in the transplanting period, the weather is hot, the roots are underdeveloped, the leaf growth is small, the nitrogen is not much, and the absorption per 667m2 is about 2kg. , accounting for 13% of the total absorption; in late August (before and after the summer heat), the growth of green leaves increased, and the amount of nitrogen needed per 667 m 2 was increased by about 2.5 kg in ten days, and by the end of September (after the autumnal equinox) it was 50 percent of the total absorption. %; at the end of October (before and after frost fall), 87.7% of the total absorption; in early November the plant nitrogen content peaked; by mid-November, it fell back to 80.7%. Therefore, nitrogen fertilizer must be applied in mid-August and re-applied in September. Absorption of phosphorus and accumulation of phosphorus were moderate, and it was basically stable at the level of 1 to 1.5 kg per 667 m2 before the beginning of September; it began to increase after mid-September, and the absorption amount per 667 m2 reached 2.8 kg, accounting for the total The absorption of 34.9%; at the end of October 667 meters 2 absorption of 6.99 kilograms, accounting for 86% of the total absorption; peaked in early November, and later gradually fall. The absorption of potassium, potassium is more important elements of green onions. Not much absorption before mid-August; a dramatic increase after mid-September, with an absorption of 9.45 kg per 667 m2, accounting for 34.85% of total absorption; an absorption of 23.33 kg per 667 m2 in October, accounting for total absorption The amount of 86.1%; with the formation of plant products, absorption peaked in early November, and fell to 80.7% in mid-November.