For the convenience of transportation and storage, most tomatoes in the market are picked before they are fully ripe, and then ripened with ripening chemicals, which will lead to the phenomenon of green seeds in tomatoes, but ripening only starts the growth and ripening process of tomatoes in advance.
Tomato is a warm vegetable. Under normal circumstances, the optimum temperature for assimilation is 20-25℃, and the optimum soil temperature for root growth is 20-22℃. Like light, the light saturation point is 70000lx, and the suitable light intensity is 30000-50000lx. It is also a short-day plant, and tomatoes like water. Generally, the soil humidity is 60%-80%, and the air humidity is 45%-50%.
How to grow tomatoes well
1. Sowing amount: Generally, tomato seeds contain about 300 seeds per gram. According to the planting density, the amount of seeds used in a field of 667 square meters is generally 20-30 grams. Each square meter of seedbed can sow 10- 15g. If the germination rate of seeds is lower than 85%, the sowing amount should be increased appropriately.
2. Sowing date: According to the planting season, climatic conditions, cultivation methods, seedling facilities and other factors, determine the appropriate sowing date. For example, in spring open cultivation, Beijing usually sows seedlings from mid-February to early March. Planting in the open field in autumn, such as Shanghai and Nanjing in the south of the Yangtze River, has the best effect from late July to early August.
3. Sowing methods: There are usually sowing, drilling and on-demand. Immediately after sowing, cover the soil with sieved fine soil. The covering thickness is about 0.8- 1.0 cm, and the thickness should be consistent. After sowing, 8 grams of 50% carbendazim wettable powder per square meter of seedbed was mixed with fine soil and sprinkled on the bed surface to prevent seedling damping-off.
The above contents refer to Baidu Encyclopedia-Tomato