Onion selection and soil fertilization
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(2) Introduction problem. Onion bulb formation period has strict requirements on temperature and sunshine. The medium and late-maturing varieties in the north can expand their bulbs at high temperature for more than 14 hours, while the mid- and early-maturing varieties in the south can form bulbs under the sunlight conditions within 13 hours of high temperature. Therefore, after the introduction of northern varieties into the South, in the short-day conditions, the bulbs can not be enlarged, only the long leaves; and after the introduction of the southern varieties into the North, the bulb expansion is too early, the performance is more early, due to underdeveloped leaves, resulting in the onion is too small, the output is not high. Therefore, attention should be paid when introducing onions from the same latitude.
(3) Density problem. In order to pursue the weight and diameter of a single onion, it is often cultivated too thin. The lack of density has greatly reduced the output, which is a common problem in various regions. In the future, the row spacing should be strictly controlled at 15 cm X 15 cm so as to obtain high yield.
(4) Product traits of varieties. The current onion production is mostly commodity production. Many places are used for export. Different onion countries and regions in the world require different onion traits. For example, in Hong Kong and Europe and the United States, white skin, spindle-shaped, and single-bulb species are required; in Japan and South Korea, yellow-peeled and flat round varieties are required: All over the country like red round spherical species. Producers should use appropriate varieties according to market requirements.
