"five steps" of vegetable Seedling raising in High temperature period

In the high temperature period, vegetables grow poorly, but also easy to infect diseases and insect pests to carry out seedling cultivation. Summer and autumn seedling vegetables are mainly cauliflower, cabbage, summer cabbage, lettuce and autumn pepper, eggplant, tomato and so on. Summer and autumn vegetable seedlings must be "six prevention", that is, anti-glare, anti-rain, anti-drought, anti-high temperature, anti-pest, anti-injury roots.

? Determination of sowing date

The sowing date of vegetable seedling in high temperature period should be determined by considering planting mode, climate characteristics, vegetable species and selected varieties. Due to the high temperature, seedlings grow and develop quickly, and the seedling period is greatly shortened compared with autumn and winter vegetables. Melon vegetables only need about 20 days, solanaceous vegetables about 30 days, and cabbage vegetables about 25 days. Nursery facilities

In addition to seedbeds, shading and rainproof facilities must be adopted for vegetable seedlings in high temperature period. The use of greenhouses, middle sheds or small arch sheds covered with sunshade nets, insect nets, waste shed films, etc. can effectively reduce the adverse effects of high temperature and rainstorm on vegetable seedlings. Lot Selection

Seedling ground should be dry and flat, soil permeability and water retention is good and can be irrigated and drained. Do not plant seedlings in continuous cropping land or plots planted with vegetables of the same crop in order to avoid soil-borne diseases and avoid serious underground pests.

Fertile garden soil which has not been planted with vegetables of the same family for many years and fully decomposed high-quality manure are selected as bed soil raw materials and prepared according to the ratio of soil to manure of 2:1. 60g of 90% trichlorfon crystal and 80g of 75% thiram wettable powder are added to each cubic meter of bed soil. The soil, fertilizer and medicine are fully mixed and sieved for later use. In order to prevent root injury after transplanting, a nutrient pot can be used to raise seedlings. seed treatment

Soak seeds in warm soup. For example, melon and eggplant vegetable seeds are put into warm water at 50-55℃, stirred and scalded, and the water temperature drops to 30℃, soaked for 6-8 hours, then soaked with 50% carbendazim WP 500 times solution for 20 minutes, washed with water, and then placed at 30℃ for germination.

Soak seeds in white wine. Seed, white spirit and water according to the weight ratio of 1: 0.5: 0.5, first white spirit and water are mixed well, then the seed is put in for soaking for 10 minutes, and then washed with clean water after being taken out.

Potassium permanganate solution soaking. The seeds are first immersed in hot water at 50 ° C for 25 minutes and then immersed in 1% potassium permanganate solution for 15 minutes. Soak seeds in copper sulfate solution. Soak the seeds in water for 10-12 minutes, then soak them in 1% copper sulfate solution for 5 minutes, remove them and wash them with water to prevent bacterial diseases. Carbendazim seed soaking. Soak in cold water for 3-4 hours, then move into 500 times solution of 50% carbendazim wettable powder for 1 hour, wash with clean water, and kill or purify pepper virus.

Seed dressing. Put the seeds into clean containers, and then add thiram, carbendazim and other chemicals according to 0.3% of the weight of the seeds, so that the chemicals adhere evenly to the surface of the seeds and can kill a variety of germs.

? Do a good job of "six precautions"

Use greenhouse, middle shed or small arch shed support, covered with sunshade net or waste shed film (can be coated with mud) and other shade to prevent high temperature, strong light, rain. No old film on the seedbed should be covered with film in time before rain.

Before sowing, irrigate sole water, can irrigate 2-3 times water before sowing. After sowing, cover with straw to keep the seedbed moist. If there is water shortage in seedling stage, irrigate small water in the morning and evening to supplement water to prevent virus diseases caused by high temperature and drought. Use insect net to cover to prevent aphids, whitefly, spotted miner and other pests.

It is recommended to raise seedlings in nutrient bowls or paper cups to reduce damage to seedling roots during transplanting and reduce the occurrence of soil-borne diseases caused by damage to roots.