Mastering Onion Transplant Production: A Comprehensive Guide for Kenyan Farmers"
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As onions continue to gain popularity among Kenyan farmers, the demand for high-quality onion transplants is on the rise. In this guide, we explore the key factors affecting onion transplant production, from temperature control to watering practices and nutrient management. Learn valuable insights to enhance the quality of your onion transplants and ensure a successful harvest.
Onion transplants are subject to stretching . Growers wishing to keep their onion transplants compact should maintain their night temperature warmer than the daytime temperature. So, if a grower is maintaining their nighttime temperature then they should be keeping the temperature in their greenhouse during the day.
Water quality should be assessed prior to growing any transplants, but onions grow best when the water source has a pH range of 5.5 to 7.0 with a low salt level. Moisture management is critical in growing high-quality onion transplants. Overwatering can lead to damping off, poor root growth, or disease development. The edges of onion plug trays can also dry out before the center of the tray so a grower should monitor moisture levels regularly. While we do not like to see moisture stressed plants, most successful onion transplant growers try to confine their watering to the morning hours. Late afternoon watering under cloudy gray skies leads to longer drying times which could promote foliar diseases in the onion plugs.
Onion transplants are considered to be light feeders. The starter fertilizer charge in most potting media will last 2-3 weeks. About 2-3 weeks after onion germination and after the first true leaf has developed growers can begin to apply nutrients via fertigation. Growers should be applying fertilizer precisely using a calibrated fertilizer injector. Growers can opt to fertilize the crop once a week at 100 ppm nitrogen or use 50 ppm nitrogen via constant liquid feed. While many different water-soluble fertilizers can be used, I would opt for a 15-5-15 fertilizer. This fertilizer has a lower phosphorus level which will reduce the likelihood of stretching.
Trimming onion transplants can be a controversial topic since the physical removal of onion foliage would seemingly encourage the risk of disease because of the wounding process. While this is a valid concern, growers find that trimming onion foliage in the transplant house yields a stronger more compact plant that is easier to mechanically transplant. Growers that advocate for trimming recommend trimming the onion plants to 4" in height after the first true-leaf develops and repeating the procedure if necessary.
As growers move closer to transplanting their onions in the field, they should consider hardening them off. Approximately one week prior to transplanting in the field consider moving the onions outdoors. Reduce watering and fertilization to slow growth and encourage hardening. Some growers like to make a single insecticide application to the onions outdoors while in the plug trays to discourage onion maggots from laying their eggs on the onion foliage.
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