Romaine (also called cos) lettuce is a tasty, popular type of lettuce. Remember: the growing medium has a different physical structure to the soil into which the lettuce is transplanted. Transplant production systems. Shout out to fish emulsion, which always moves the plants along at top growing speed. Interestingly, four different forms of blindness were identified which can all look superficially similar, but the causes are different. Developing in the seedling phase, the condition is generally a problem for seedling propagators over summer. “The incidence increased after some hot spells, but not after others, so factors other than just high temperature and humidity must be involved.”. “Despite some certainty that high temperatures and humidity were key factors, the trials demonstrated that the incidence of blindness was extremely variable. Industry News DIRECT SEEDING for BABY LEAF: Seeds can germinate well in soils as low as 40°F (4°C) but often poorly above 75°F (24°C). in response … Let’s talk about one of the more frustrating parts of propagating and transplanting: the dreaded transplant shock. Smart tip about reducing transplant shock A study was conducted on young birch saplings that were transplanted and sugar water. The more roots that come with the plant, the less likely transplant shock in plants will set in. Significant transplant shock can result in poor plant stands and a lower percentage cut of good quality lettuce. How to Transplant Leggy Lettuce. A series of glasshouse trials were then conducted to examine some of the suggested stress factors contributing to blindness. Romaine grows in tall heads of sturdy leaves and is very heat tolerant. for both lettuce transplant root and shoot growth when floata tion irrigation is used are lacking. Space or thin looseleaf varieties to 20-25cm (8-10″) apart. Sow seeds 5mm (¼â€) deep, or on the surface of the soil where the soil can be kept evenly moist.. Space or thin heading lettuce to 30cm (12″) apart. The increase in early growth resulted in larger lettuces at harvest in the first trial, although in a second trial, the effect was reduced at harvest maturity. Project VG12017 examined blindness and the resulting problem of multiple heading, as well as transplant shock and its effect on harvestable lettuce yield. Stresses due to root damage, changed environment or water stress can all contribute to transplant shock, resulting in poor plant stands and a lower percentage cut of good-quality lettuce. Small cells such as 128, 200 or 288 may be used for crops such as lettuce or onions. In fact, it's not too hard for a careful grower to raise tomatoes, lettuce, brassicas and cucurbits that show no signs of transplant shock after they are set out. To ease the shock of being set out in the garden in mid- or late-summer heat, shade transplants for a few days and keep them well watered. For ... and Cole crops. Use good-quality irrigation water with an EC below 900 μs/cm (including nutrients) and avoid excessive chlorine. Bring as much of the roots as possible Along the same lines as the tip above for plant preparation, preventing shock means when digging up the plant, make sure as much of the roots as possible is brought up with the plant. Space romaine plants at least 12 inches (30 cm.) Figure 4: Iceberg lettuce head weights at harvest. It was developed in consultation with industry, particularly seedling producers in New South Wales and Queensland. Instead, transplant romaine seedlings on a cloudy day or in the evening to prevent the plants from dehydrating and to reduce transplant shock. Spacing is more important for head lettuce than with other types. If you keep all plants there is a chance that they will not grow as full as just one lettuce. Bare-root transplants can suffer more transplant shock than plugs, so start with “easy to transplant” crops, such as brassicas (cabbage, kale, collards, broccoli, Brussels sprouts, kohlrabi), lettuce, onions and leeks. Transplant shock is a check in growth that can occur when seedlings are transplanted from the seedling tray into the field. The final report for this project is available on the InfoVeg database. Apply a foliar spray of chelated calcium twice-weekly during early development. For example, if they were replanted between cabbage seedlings, lettuce plantlets will benefit from some shade, which is very helpful to their growth. Even perfect-looking pepper plants often just sit in the ground for two to three weeks before reestablishing vigorous growth. Transplanting lettuce within the garden or indoors is a fairly delicate process that requires attention and care. apart. Optimizing root growth is important since transplants with well-developed root systems recover more quickly from transplant shock (Weston and Zandstra, 1986), leading to earliness, improved head growth, and ultimately higher yields. One tip is to transplant them in the late afternoon when the sun has already gone down a bit. Hi, Since you say you are about to start your lettuce, I imagine you are talking about seedlings? Dousing the soil and watering with sweetened water significantly reduced mortality and transplant shock. The following can reduce the risk of blindness in lettuce: Two field trials tested the effect of pre-transplant potassium nitrate drenches (80 grams per 1,000 seedlings in five litres of water) on the growth and final yield of iceberg and cos lettuces. Water thoroughly after transplanting An important transplant shock preventer is to make sure that your plant re… It gets its name from the Romans, who likely imported it from either Greece or (more likely) Arabia. Later, the discolored tissue dries out andturns brown. Germinating seed at lower temperatures (below 20 degrees Celsius), avoid growing seedlings at temperatures above 35 degrees Celsius and use misting to reduce leaf temperature in hot conditions. Growers were surveyed on factors they considered likely to increase blindness, and mitigation strategies. Leaf scorch is a common symptom of transplant shock. Those working in the Cherry, Vege…, Controlling multiple heading and transplant shock in lettuce, Management of blindness in lettuce seedlings. Lettuce transplant root and shoot growth and development in relation to nitrogen, phosphorus, potassium, and water management Item Preview remove-circle Share or Embed This Item. Grow non-susceptible lettuce varieties. This trial is seeking ways to overcome or prevent blindness in lettuce—increasing the Promote fast drying of spray residues. Tomatoes and peppers are worth trying next. 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