How to Grow Allium cepa var. aggregatum? Detailed Guide to Cultivation Methods and Management Key Points

The scientific name of Allium cepa var. aggregatum is tillering onion, a crop introduced to Jilin from Japan, and it is grown in the yards of most farming households in the Northeast region. So how do you grow Allium cepa var. aggregatum?

How to Grow Allium cepa var. aggregatum?

1. Land preparation and fertilization

For planting Allium cepa var. aggregatum, you should choose a relatively flat plot of land with loose soil, strong water and fertilizer retention capacity, and convenient drainage and irrigation, and neutral soil. Before planting, level and harrow the plot finely, and apply high-quality decomposed farmyard manure and nitrogen-phosphorus-potassium compound fertilizer; the application amount of fertilizer should be determined according to actual conditions.

2. Sowing and raising seedlings

Allium cepa var. aggregatum is generally sown between April 5 and April 10 (the specific time may be appropriately advanced or delayed according to weather and other factors), with double rows planted per ridge, a plant spacing of 10 cm, and a row spacing of 15 cm, preferably by manual placement. Before planting, open furrows on the ridge surface and widen them appropriately, complete fertilization and soil covering, and after planting cover with 1-2 cm of soil. After the Allium cepa var. aggregatum has emerged completely, depending on the weed situation, carry out three hoeings and three ridgings, and hoe weeds and loosen the soil between the seedlings.

3. Topdressing and irrigation

If Allium cepa var. aggregatum encounters drought during the growing period, it can be irrigated; for large-scale planting, sprinkler irrigation can be used to keep the soil constantly moist to facilitate growth. Under normal circumstances, if there is no rain for 7 days, sprinkler irrigation is needed once. Each mu of land is topdressed with urea in three applications, generally by manually spreading it evenly on the ridge surface and then spraying water to promote its dissolution and absorption; topdressing can be done from late May to early June.

4. Pest and disease control

Pay attention to downy mildew, gray mold, and purple blotch, as well as pests such as onion thrips, attacking Allium cepa var. aggregatum; corresponding pesticides can be sprayed in advance for prevention and control.

In addition, when the outer scales of the Allium cepa var. aggregatum bulbs become dry, harvest promptly, otherwise quality and yield will be affected.