Cucumber cultivation in the greenhouse during the seedling period is improper, prone to light flash sprouts, rigid seedlings, dwarfing seedlings and other abnormal seedlings, how to deal with it?
1. Light flash seedlings. In the case of continuous cloudy days, strong light, high temperature and wind blow water supply and demand of guajava seedlings. The upper part of the seedlings softens and withers, and the whole plant dies when serious.
Response measures: In case of more than 2 days with cloudy days, the weather will be lightly and weakly lightened after sunny days. Found melon seedlings wilt, immediately sprayed 300 times the rice vinegar, or photosynthetic micro-fertilizer, high yield treasure, etc., add water and nutrients, stimulate melon seedling vitality. Remove unrecoverable plants in time, and make up.
2. Fossilized seedlings. After 4 days of emergence of seedlings, the cotyledons were dark green, leaf margins were lower, stems were short, and growth was slow. They were mostly caused by less fertilizer, less water, excessive soil viscosity, or unfermented manure.
Responsive measures: Sticky soil should be mixed with fine sand, deep exposure. The base fertilizer should be dominated by organic fertilizers and watered before sowing to meet the water requirement during seedling period. Water spray or foliar growth promotes long.
3. Dwarfed seedlings. Seedlings are dwarf, with small leaves, light and dull colors, internodes too dense, stems hardened and fine, roots are stunted, yellow-brown. Seedbeds have poor soil quality and lack of water, especially when there is water shortage, low temperature, and lack of fertilizers.
Response measures: (1) Choose a soil with fertile soil, permeable land or sandy soil as seedbed. The nutrient soil should be mixed with fully cooked high-quality organic fertilizer in a ratio of 6:4, and appropriate amount of plant ash should be added. Sufficient moisture is supplied. The seeds are soaked in enough water before sowing. The relative humidity of the soil is maintained at 70%-80%. (2) The temperature needed to maintain the germination of the seedlings is generally kept at 22°C-25°C during the day and 12°C-18°C at night.
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