The latest tomato planting time

Tomato likes temperature, and the suitable temperature is 25: 28 ℃ in daytime and 16: 18 ℃ at night. Below 15 ℃, tomato seed germination, pollination and fertilization and tomato turning red were affected: below 10 ℃, the growth was slow, the reproductive development was inhibited, the stem and leaf stopped growing at 5 ℃, 2 ℃ was chilled, and 0 ℃ was frozen to death. The reproductive development was affected when it was higher than 35 ℃, and died of heat due to physiological disorder above 40 ℃. Sufficient light and suitable temperature difference are beneficial to the accumulation and maturity of nutrients, promote the healthy development of plants, prevent overgrowth, enhance the disease resistance and stress resistance of tomato, and increase the yield.

Planting time of tomato

In general, according to the different planting and harvest time, tomatoes are divided into spring tomato, autumn and winter stubble, winter and spring stubble and overwintering stubble. Let's take a look at their planting time.

1. Planting time of spring tomato

The suitable seedling age for spring tomato cultivation in open field is 50ml 70 days, that is, it should be sowed 70 days before planting. For example, in Shenyang, located at latitude 41 north, spring tomatoes were planted in the protected field in February and planted in the open field after the late frost in early May.

Spring tomatoes are generally planted immediately after the local late frost period, when the soil temperature of the plough layer 5 Mel 10 cm deep stably passes through 12 ℃. For example, the average late frost period in Shenyang is May 2, and the suitable planting period is generally May 6-10. The Yangtze River basin is generally around the Qingming Festival, North China before and after Grain Rain, and the northeast region before and after the Beginning of Summer. The sandy land with Phoenix barrier, plastic film cover, and leeward and sunny terrain can be planted early. Planting should also be determined according to the weather conditions. In case of cloudy, rainy and Phoenix weather, planting should be postponed appropriately. In the suitable planting period, Shaanxi tomatoes should be planted early, mainly according to the time on the market, there are mainly two seasons a year, one is delayed cultivation after autumn, the seedlings start after July and August, and can be put on the market one after another in November. One is cultivated in early spring, raising seedlings in November and February and listing in May and June.

2. Planting time in autumn and winter.

The autumn and winter stubble is generally sown and raised seedlings from mid-July to early-middle August, and planted from mid-late August to early September. The plastic film was buckled from mid-late September to early October and harvested from late November to early February of the following year.

3. Planting time in winter and spring.

The winter and spring stubble was sown from early November to early December, planted from mid-late January to early February, and harvested from early-mid-March to June the following year.

4. Planting time of overwintering stubble

Overwintering stubble belongs to a large stubble cultivation. Generally, seedlings are raised from mid-late September to early October, planted in November, and harvested in January of the following year.

Tomato seed treatment

1. Soak the seeds with warm soup

Soaking seeds with warm soup is an effective measure to break seed dormancy, promote seed germination, sterilize and prevent disease, and enhance seed resistance.

① soaked the seeds in clean water for 1-2 hours.

② remove and put the seeds in warm water of 55 degrees Celsius, keep the water temperature and soak for 15 minutes, then soak the seeds for 3-4 hours, and then accelerate germination. When soaking seeds in warm soup, usually one seed and two parts of water. At the same time, stir constantly and quickly so that the seeds are heated evenly to prevent scalding the seeds.

③ should keep heating water to keep the temperature of 55 degrees Celsius. This disinfection method can prevent the occurrence of tomato leaf mold, canker, early blight and other diseases.

2. Disinfection with medicament

Soak the seeds with ① trisodium phosphate: first soak the seeds in clean water for 3-4 hours, remove them and drain them, then soak them in 10% trisodium phosphate solution for 20 minutes, rinse with clean water and accelerate germination. This method has obvious effect on tomato virus disease.

Soak seeds in ② formalin solution: soak the swollen seeds in 1% formalin solution for 15-20 minutes, seal the container so as not to volatilize the liquid when soaking the seeds, then wrap them in a closed container with a wet cloth for 2-3 hours, rinse with clean water repeatedly, and then soak the seeds to accelerate germination, this method can reduce or control the occurrence of tomato early blight.

③ soaked seeds with 0.1% potassium permanganate solution for 15 minutes, which could effectively reduce the occurrence of tomato mosaic virus and early blight.

④ put the pre-soaked tomato seeds in 1000mg/kg agricultural streptomycin solution for 30 minutes, which had a good effect on the control of bacterial wilt.