Cultivation points:
(1) Breeding seedlings for strong seedlings should be selected for retention of water and strong fertility. Loamy soil with high organic matter content. Leveling and squeezing. Select new seeds for sowing. 20-25 grams of seed per acre of field, about 10 square meters of bed area, after sowing, After repression, the seeds are closely connected with the soil, do not need to be covered with soil, and covered with a thin layer of straw or shade nets, and then watered. When the seeds are sown in the early June-August of the high temperature season, the germination treatment is generally required. The first soaking is for 4-6 hours and it is wrapped in gauze. Put a 5 to 10 °C refrigerator, or hung on the surface of deep water wells to germination at low temperature, until the seeds can be sown white. After the emergence, the ground cover must be removed in time, and the seedlings must be prevented from growing in time. During the high temperature period, nursery should use a greenhouse and a small shed to make it a rainproof shed, cover the shade net to cool the seedlings, and use a 128-hole seedling to grow seedlings.
Hydroponic Lettuce mostly uses agricultural polyurethane foam cubes (2.5 cubic centimeters) or special porous small plastic pots filled with agricultural rock wool as a nursery container, with 0.8 millisiemens/cm conductance. Liquid supply, nursed in nursery trays or nursery beds.
(b) Soil preparation and cultivation of lettuce cultivation blocks should be selected for water conservation and fertility, soil fertility, convenient drainage and irrigation plots, Mushi smelting manure about 1000 kg, superphosphate 20 kg, 40-50 kg of plant ash, fine soil preparation ,Knot ball species spacing 25-30 cm square line by row, non-knot ball by 20-25 cm square planting, harvesting seedlings 10 cm row spacing can be set seedlings.
(C) fertilizer and water management due to raw vegetables, topdressing can not be applied to human fecal urine, generally urea-based, timely topdressing 3-4 times, after planting slowly pouring 0.3% urea, urea per acre About 5 kilograms, after every 10 days, 1 time, more water in case of drought. After the closure of the line, it is no longer necessary to fertilize the water and keep it dry to prevent the occurrence of downy mildew and sclerotinia.
(4) Pest control pests are mainly locusts, which can be sprayed with 40% of Leko-emulsion 1000 times; diseases have sclerotia, downy mildew, and burning, etc. Downy mildew can be used 75% chlorothalonil 600 times or 1: 1:200 times Bordeaux mixture, Sclerotinia can be used 50% carbendazim 1000 times or 50% thiophanate 500 times, every 7-10 days with spray 2-3 times.
(v) Hydroponic lettuce lettuce nutrients are formulated using Yamazaki formula (240 grams of calcium nitrate tetrahydrate, 404 grams of potassium nitrate, 57 grams of ammonium dihydrogen phosphate, 123 grams of magnesium sulfate, and trace elements: 16 grams of chelated iron per ton of water. 1.2 g of boric acid, 0.72 g of manganese chloride, 0.09 g of zinc sulfate, 0.04 g of copper sulfate, and 0.013 g of sodium molybdate). At different growth stages, different concentrations of nutrient solution were used. The conductance is 0.8-1 millisiemens/cm in the initial stage and colonization, 1.2-1.6 millisiemens/cm in the middle and late period, 1.4 millisiemens/cm in the spring and autumn, and 1.2 millisiemens in the summer. In centimeters, winter is 1.6 millisiemens/cm, pH is adjusted to about 6.0, and a 0.005% nitric acid can be supplemented with nitrogen fertilizer during the growth period.
For hydroponics, butter lettuce or wrinkled lettuce is used; the row spacing is 15-2020 cm.
The NFT supplies liquid every 15 minutes for 5 minutes. The liquid supply per tank is 2.5 liters/minute. The deep-water culture takes 5-10 minutes for each half-hour of the liquid supply. However, it is best to supply liquid continuously during the summer.
Harvest:
The leaf lettuce has a short growing period and is not harvested in a timely manner in the hot season. It will produce convulsions. After the low temperature season, it will crack, usually without lettuce, with nearly 200 grams per plant. The weight of a single ball is generally 400. One 500 grams. The young plants can be marketed when they grow to 7-8 leaves at the seedling stage in summer.
(1) Breeding seedlings for strong seedlings should be selected for retention of water and strong fertility. Loamy soil with high organic matter content. Leveling and squeezing. Select new seeds for sowing. 20-25 grams of seed per acre of field, about 10 square meters of bed area, after sowing, After repression, the seeds are closely connected with the soil, do not need to be covered with soil, and covered with a thin layer of straw or shade nets, and then watered. When the seeds are sown in the early June-August of the high temperature season, the germination treatment is generally required. The first soaking is for 4-6 hours and it is wrapped in gauze. Put a 5 to 10 °C refrigerator, or hung on the surface of deep water wells to germination at low temperature, until the seeds can be sown white. After the emergence, the ground cover must be removed in time, and the seedlings must be prevented from growing in time. During the high temperature period, nursery should use a greenhouse and a small shed to make it a rainproof shed, cover the shade net to cool the seedlings, and use a 128-hole seedling to grow seedlings.
Hydroponic Lettuce mostly uses agricultural polyurethane foam cubes (2.5 cubic centimeters) or special porous small plastic pots filled with agricultural rock wool as a nursery container, with 0.8 millisiemens/cm conductance. Liquid supply, nursed in nursery trays or nursery beds.
(b) Soil preparation and cultivation of lettuce cultivation blocks should be selected for water conservation and fertility, soil fertility, convenient drainage and irrigation plots, Mushi smelting manure about 1000 kg, superphosphate 20 kg, 40-50 kg of plant ash, fine soil preparation ,Knot ball species spacing 25-30 cm square line by row, non-knot ball by 20-25 cm square planting, harvesting seedlings 10 cm row spacing can be set seedlings.
(C) fertilizer and water management due to raw vegetables, topdressing can not be applied to human fecal urine, generally urea-based, timely topdressing 3-4 times, after planting slowly pouring 0.3% urea, urea per acre About 5 kilograms, after every 10 days, 1 time, more water in case of drought. After the closure of the line, it is no longer necessary to fertilize the water and keep it dry to prevent the occurrence of downy mildew and sclerotinia.
(4) Pest control pests are mainly locusts, which can be sprayed with 40% of Leko-emulsion 1000 times; diseases have sclerotia, downy mildew, and burning, etc. Downy mildew can be used 75% chlorothalonil 600 times or 1: 1:200 times Bordeaux mixture, Sclerotinia can be used 50% carbendazim 1000 times or 50% thiophanate 500 times, every 7-10 days with spray 2-3 times.
(v) Hydroponic lettuce lettuce nutrients are formulated using Yamazaki formula (240 grams of calcium nitrate tetrahydrate, 404 grams of potassium nitrate, 57 grams of ammonium dihydrogen phosphate, 123 grams of magnesium sulfate, and trace elements: 16 grams of chelated iron per ton of water. 1.2 g of boric acid, 0.72 g of manganese chloride, 0.09 g of zinc sulfate, 0.04 g of copper sulfate, and 0.013 g of sodium molybdate). At different growth stages, different concentrations of nutrient solution were used. The conductance is 0.8-1 millisiemens/cm in the initial stage and colonization, 1.2-1.6 millisiemens/cm in the middle and late period, 1.4 millisiemens/cm in the spring and autumn, and 1.2 millisiemens in the summer. In centimeters, winter is 1.6 millisiemens/cm, pH is adjusted to about 6.0, and a 0.005% nitric acid can be supplemented with nitrogen fertilizer during the growth period.
For hydroponics, butter lettuce or wrinkled lettuce is used; the row spacing is 15-2020 cm.
The NFT supplies liquid every 15 minutes for 5 minutes. The liquid supply per tank is 2.5 liters/minute. The deep-water culture takes 5-10 minutes for each half-hour of the liquid supply. However, it is best to supply liquid continuously during the summer.
Harvest:
The leaf lettuce has a short growing period and is not harvested in a timely manner in the hot season. It will produce convulsions. After the low temperature season, it will crack, usually without lettuce, with nearly 200 grams per plant. The weight of a single ball is generally 400. One 500 grams. The young plants can be marketed when they grow to 7-8 leaves at the seedling stage in summer.
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