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; However, the yield of sowing in early July in eastern Sichuan is higher. The output is also high.
In some areas where tomato diseases occur seriously, higher yield can also be obtained by appropriately delaying sowing date 1-2 months, and then taking measures such as close planting, early coring and increasing fertilizer and water.
Extended data:
I. Planting conditions
1, temperature
From sowing to the appearance of the first real leaf (heartbreak). This period is 7-9 days at room temperature; Seedling stage refers to the period from the appearance of the first true leaf to the appearance of the first inflorescence. The suitable daytime temperature is 25-28℃, and the nighttime temperature is 13- 17℃.
The ground temperature in this period has a great influence on the growth of seedlings, and the suitable ground temperature should be kept at 22-23℃; The first flowering and fruit-setting period refers to the period from the first inflorescence to fruit-setting. This stage is the turning point of tomato from vegetative growth to reproductive growth and vegetative growth, which is directly related to the formation and yield of product organs.
2. Land
Tomatoes can tolerate drought, but not waterlogging, and the requirements for soil are not very strict. To obtain high yield, we must choose soil with deep soil layer, loose and fertile soil and strong water and fertility conservation.
Step 3 plant
Timely sowing and reasonable close planting: early-maturing cultivation in protected fields in spring should be planted in cold weather from late February to early March; Plastic film mulching cultivation in the open field was planted around March 20 when the weather was cold. The planting density is about 3000 plants per mu, and the spacing between early-maturing varieties is 50×30 cm. About 3500 plants per mu were pruned by single stem for middle and late maturing varieties; When pruning two stems, there are about 2000 plants per mu.
Second, eating is very important.
First, it is not suitable for raw food, especially for women with deficiency of spleen and stomach and menstrual period. If you just take tomatoes as a fruit to supplement vitamin C, or clear away heat and relieve summer heat in midsummer, it is better to eat them raw.
Second, it is not advisable to eat on an empty stomach. When the stomach is empty, gastric acid secretion increases. Because a chemical contained in tomatoes combines with gastric acid, it is easy to form a water-insoluble block, which often causes abdominal pain, stomach discomfort and flatulence.
Third, immature cyan tomatoes should not be eaten because they contain toxic solanine. Eating immature cyan tomatoes will make you feel bitter and overeating. In severe cases, it will lead to poisoning, dizziness, nausea, general malaise, vomiting and general fatigue, and even life-threatening in severe cases.
Baidu encyclopedia-tomato
Baidu encyclopedia-tomato