Onions need high-yield management to see this
After entering the spring, how the onion is managed scientifically has become a common concern for many growers. So where is the onion spring tube? On this issue, the reporter interviewed Luo Yang, senior agronomist of Yangling Qin Hongbao Agricultural Science and Technology Development Company. He pointed out that onion planting in spring must be done well with water and fertilizer management, and management in the later period should also be emphasized.
The first application of fertilization after spring fertilization in the spring will supplement the growth of the onion root system, and lay the foundation for the vigorous growth of the above-ground parts. Fertilization should be based on fully decomposed organic fertilizers, with 1,000 kg applied per acre, with 20 kg of superphosphate and 10 kg of potassium sulfate added in between. The plastic film is generally covered only by combining 15 kg of ammonium diammonate and 10 kg of potassium sulfate per acre. When onion plants grow to about 10 true leaves and bulbs begin to become hypertrophic, they begin to apply a priming fertilizer, which can be applied 3 times, and 20 kg of ammonium sulfate can be applied per square meter. The midpoint of bulb enlargement is the focus of fertilization. The amount of fertilizer should be large. When the bulb begins to swell, do not apply too much nitrogen to prevent the plant from "greediness." During bulb expansion, potassium sulfate should be added during fertilization at an amount of about 10 kg/mu, because the lack of potassium on the onion will result in poor storage stability.
Timely watering planted onion before winter, spring water poured back to the Qingshui, poured back to Qingshui to be timely, premature watering will reduce the temperature of the soil, is not conducive to the growth of onions, will inhibit the growth of plants too late, the occurrence of dry leaves Sharp phenomenon. When the onion bulbs begin to expand, the length of the seedlings must be controlled according to the soil, climate, and plant growth conditions. When the sandy soil or the climate is dry, the seedling stage should be shortened appropriately; the clay soil, low-lying, It is necessary to appropriately extend the seedling stage during the rainy season. The purpose is to promote the expansion of onion growth into bulbs, which generally takes about 10 days. It is generally believed that the mature tubular leaves of onions turn dark green, the leaves are hypertrophied, the waxiness of the leaves is increased, and the color of the heart leaves is deepened, which is the sign of the end of the seedlings in this period. After the seedlings are planted, they are generally poured with water every 5 days to promote the rapid expansion of the bulbs. When the plants in the field are partially lodged, watering is stopped to avoid storage after the bulbs are harvested.
When cultivating earth onions does not cover the plastic film, cultivator must be carried out before seedlings. More viscous soils have more cultivating times than sandy soils. The cultivating depth should be controlled within 3 cm, near the plants at shallow depths and deeper away from the plants. After planting ridges, stop cultivating. In the middle of cultivating, earthing can be properly performed.
The timely harvest is generally harvested in mid-June. The main sign of maturity of onion bulbs is that in the late stage of bulb expansion, no new leaves are filled with leaf sheaths, and the pseudo stems are hollow, and the plants are dumped from the base of the false stems. The sooner or later of bulb maturity period is related to the characteristics of onion varieties, planting time and climatic conditions. The varieties with short dormancy period and poor storability should be harvested as early as possible. When half of the plants fall down, they can start harvesting, while the harvest time of late-maturing varieties is late, and 70% of the plants should be harvested when lodging.
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