Winter and spring pods are one of the main cornices in sunlight greenhouses, and die and shoots often appear in production. What caused the dead seedlings? What measures should be taken?
1. Fertilizer harm: First, use fertilizers that are not fully decomposed, and second, apply too much fertilizer.
Countermeasures: Organic fertilizers must be decomposed through high-temperature stacking. Normally, it takes more than 50 days in summer and more than 100 days in winter. Enzyme bacteria can be used to accelerate decomposition. In the case of a large amount of organic fertilizer, no fertilizer is applied or applied during planting. Fertilizer is mainly composed of ternary compound fertilizer and less single nitrogen fertilizer. Top dressing needs to be more than 10 cm from the seedlings, watering after top dressing.
2. Immediately after the shade is overcast: After a period of overcasting or rain and snow, it will cause acute wilting of the original water-deficient cucumber. If the time is long, the remedial measures are not timely, and it is easy to cause dead seedlings.
Countermeasures: After rain or heavy snow, it is necessary to gradually see light, such as wilting of seedlings, timely shading and replenishment. Foliar spray method can be used, supplemented with 1% glucose water better. If the temperature is not too low for continuous cloudy days, we must try to lift the curtain and see the light, and hang a curtain of reflection on the back wall of the greenhouse, which will play a positive role. Snow removal after heavy snowfall.
3. Ventilation is unreasonable: The cucumber enters the stage of flowering and nectarine, the sunny days are high temperature, the amount of air is large, and the leaf transpiration is fast. Some plants with poor rooting begin to wilt, and those with serious water loss are withered.
Countermeasures: Vents should be large to small. Every day, check whether the film is damaged or leaked. Pay attention to repair and increase the temperature of the insulation. Before the advent of strong winds, cover the grass and lock the ropes to prevent cold winds from invading and injuring the melon seedlings.
4. Cold damage or frost damage: When the temperature is low or the temperature is lower than -10°C, the cucumbers in the solar greenhouse tend to produce cold damage or frost damage. The vegetable farmers have been able to defend themselves because of the high winter temperatures for many consecutive years. When they encounter cold temperatures, they cannot defend their plants. Plants die due to cold or freezing injury.
Countermeasures: To prevent extreme cold temperatures, the thickness of the back wall of the solar greenhouse must not be lower than the local reasonable value. Grass curtains and rain-proof membranes can be added. The grass curtains around the solar greenhouses can be covered with seedlings at low temperatures in the greenhouse. The middle and small sheds are buckled, straw awnings are covered, and after extension, bonfires and charcoal pots can be used to supplement warming.
5. Roots: The phenomenon of dead seedlings caused by roots often occurs shortly after seedbed or planting. Many of the seedlings or cultivated fields are often watered too much to cause soil moisture at low temperatures, and the roots are eroded, causing the ground to stop growing.
Countermeasures: In winter, the ground temperature, low temperature, watering should be a small number of times, do not flood irrigation. Low temperatures, high soil moisture, and even rainy weather, it requires less or no watering. Into the fruiting period, can be combined with top dressing watering, with water fertilizer, pouring once every 10 days. Watering should be carried out in the morning on sunny days. Avoid watering in the afternoon and evening. Rainy days should not be watered in the entire shed.
6. Diseases: The dead seedlings of cucumber in the sunlight greenhouse are mostly caused by damping-off disease and blight. After planting, the diseases of dead trees are more serious, such as wilt disease, epidemic disease, root rot disease, and blight disease.
Countermeasures: Select disease-resistant varieties, do a good job in the disinfection of seeds and nursery soil, find the diseased plants in a timely manner to remove the shed, and the surrounding plants for prevention and treatment. Blight, damping-off disease commonly used 72.2% Prec 600 ~ 800 times or 58% metalaxyl 500 ~ 600 times spray control; epidemic disease can be 72% DuPont Kelu 800 times liquid foliar spray control; Root rot can be sprayed with 50% carbendazim 600 times to control the roots, and 75% of chlorothalonil WP can be sprayed to prevent and cure the blight; control of wilt disease can be controlled by grafting, and 40% of the drug is controlled by DuPont. Fuxing or 50% Carbendazim Irrigation.
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