Detailed Explanation of Key Field Management Techniques for Onion Cultivation

Onion is a strongly flavored vegetable, and spring is the peak season for onion growth. Field management is the key to high yield and high quality of onions, so how should we carry out field management in spring to promote onion growth? Recently, quite a few friends have consulted online, wanting to understand onion cultivation and management techniques. In response to everyone's needs, the editor brings you an introduction to the key field management techniques for onions. Let's take a look below.

1. Watering

Onions are generally planted in autumn. After planting, we should water with overwintering water to ensure the onions safely overwinter. Onions basically enter the regreening stage in mid-March, so we need to grasp the watering time well, generally watering with regreening water around Qingming Festival. Then, as the temperature slowly rises, the onions enter the vigorous growth stage. At this time, we mainly aim to promote the growth of onion leaves, usually watering about once every ten days. After the onions undergo seedling restraining, they enter the bulb expansion stage, and their water demand increases. During this period, watering is generally done about once every five days. Finally, note that near the harvest period, we should appropriately reduce the amount of watering and gradually stop watering.

2. Fertilizing

Onion fertilization should be carried out in stages, which is beneficial to onion growth. Generally, after base fertilizer is applied to onions, there is no need for early-stage topdressing, but when the plants grow vigorously, topdressing should be done in time, mainly with organic fertilizer, with the amount per mu controlled at around 4,000 jin, and used in combination with phosphorus and potassium fertilizers. When fertilizing, nitrogen fertilizer should not be applied in a one-sided way, so as to avoid excessive leaf growth and early bolting. The second topdressing is during the bulb expansion stage. At this time, the fertilizer demand is relatively large, and we mainly use phosphorus and potassium fertilizers, which can promote the enlargement of the underground part.

3. Hilling

During the planting process, onions should be properly cultivated and hilled, which helps enhance soil permeability and improve nutrient utilization, thereby promoting bulb expansion and increasing bulb yield. During the onion seedling stage, loosening the soil should be done more frequently, generally about four times. When the onions enter the stem and leaf growth stage, we should appropriately reduce the frequency, generally two times is enough. Finally, note that when loosening and hilling the soil, it is best to plow shallowly, so as not to damage the underground bulbs of the onions and affect onion quality.

4. Removing Bolting Stems

During the growth process, onions may bolt early. In order to increase onion yield, we need to take certain remedial measures. First, when flower buds appear on the onions, we should remove them before they form flower heads, but they should not be removed too early, otherwise it will also affect onion growth. At this stage, it is best to use the methods of removing buds and splitting bolting stems, which can reduce damage to the onions, promote the growth of side buds, and play a role in swelling the underground bulbs.

5. Disease and Pest Prevention

The main diseases of onions are leaf blight and purple blotch. We should carry out timely prevention and control, and it is best to use crop rotation rather than continuous cropping. Second, when planting, carbendazim can be used for seed dressing. In the early stage of disease onset, chlorothalonil or mancozeb can be used for spraying control. Finally, attention should also be paid to the harm caused by thrips and seed maggots, which can be sprayed and killed with deltamethrin.

The above is the introduction to field management techniques for onion cultivation brought to you by the editor. Through reading the above, I believe it can be of some help to everyone. The editor also wishes everyone high yields year after year.