There are a number of things seedling producers can do to reduce risk of blindness in lettuce. Hi, Since you say you are about to start your lettuce, I imagine you are talking about seedlings? Adam Goldwater, of AHR, said the project tried to determine whether the incidence of blindness was correlated with factors such as temperature, humidity, water stress and crop nutrition. Significant transplant shock can result in poor plant stands and a lower percentage cut of good quality lettuce. Let’s talk about one of the more frustrating parts of propagating and transplanting: the dreaded transplant shock. Growers were surveyed on factors they considered likely to increase blindness, and mitigation strategies. Use good-quality irrigation water with an EC below 900 μs/cm (including nutrients) and avoid excessive chlorine. apart. Transplant shock is a check in growth that can occur when seedlings are transplanted from the seedling tray into the field. Step 5- Prune & Transplant your Lettuce Plant into a Larger Pot. Dousing the soil and watering with sweetened water significantly reduced mortality and transplant shock. Transplant young seedlings into 2"-3" containers when they have two true leaves and grow on until planted in the field. Avoid burning seedlings. 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. Do not spray when plants are stressed under extremely hot conditions. When it comes to reducing transplant shock of lettuce seedlings, Mr Goldwater suggests drenching with potassium nitrate, which can also increase early growth. 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. 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. “The disorder is likely the result of a number of different stresses on the plant during a critical phase of early growth, especially during the warmer months,” he said. In hot weather lettuce goes to seed rapidly, so have new plantings ready to go. Drenching with potassium nitrate increased leaf growth, particularly early in growth. The final report for this project is available on the InfoVeg database. Instead, transplant romaine seedlings on a cloudy day or in the evening to prevent the plants from dehydrating and to reduce transplant shock. After they reached a hearty height, I planted them into my raised bed. In order to look at how we can help the plant through this time, we’ll divide these stresses into three different categories: environmental changes, physical damage, and nutritional deficiencies. Stresses due to root damage, changed environment or water stress can all contribute to transplant shock. Spacing is more important for head lettuce than with other types. Starting Direct sow or start indoors and transplant. Leaf scorchfirst appears as a yellowing or bronzing of tissue between the veinsor along the margins of leaves of deciduous plants (those that losetheir leaves in winter). Use good-quality, non-saline irrigation water, grow varieties less susceptible to blindness and don’t spray when plants are stressed to avoid burning seedlings. Controlling multiple heading and transplant shock in lettuce was a strategic levy investment under the Hort Innovation Vegetable Fund. If you keep all plants there is a chance that they will not grow as full as just one lettuce. The lettuce that got transplanted into the greenhouse six weeks ago got its second application of full strength fish emulsion yesterday, and the outer leaves are ready to pick. You can reduce transplant shock by avoiding too rapid growth and by hardening the plants. Some associations with other plants are beneficial to lettuce seedlings. Giving romaine lettuce plenty of room to grow results in larger heads. 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. The UC Master Gardeners of Santa Clara County recommend transplanting lettuce on an overcast day or in late afternoon to reduce stress on the 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. The name makes it sound worse than it actually is, but transplant shock is still something to watch out for whenever you are moving your plants from one container to another. 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. Leaf scorch is a common symptom of transplant shock. News & Media On needled ever… Separate trials were conducted in the field to evaluate methods for reducing transplant shock in lettuce seedlings. It was developed in consultation with industry, particularly seedling producers in New South Wales and Queensland. Set transplants or thin seedlings 10 to 12 inches apart. The more roots that come with the plant, the less likely transplant shock in plants will set in. Days before transplanting can help plants overcome transplant shock appear as wiltingleaves especially. Stresses plants experience during the last 2 to 3 days before transplanting ground for to. 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