It's the season of strawberry sales again. A red strawberry with sweet and sour juice exploding in the mouth, and the soft and smooth flesh "melting" in the mouth, it's so intoxicating! But have you really washed the strawberries you ate? Be sure not to remove the stem when washing strawberries! Someone has really studied how strawberries can be cleaned the cleanest. The most crucial operation: Do not pick strawberry stems! Researchers selected representative Shuofeng strawberries, each weighing 3kg from supermarkets, fruit shops, and roadside fruit stalls, with an average of 8 portions each, to compare the effects of different cleaning methods on pesticide residues in strawberry samples. The experimental results showed that there was a significant difference in removing pesticide residues between removing the strawberry stem and not removing it. Strawberries soaked after removing the stem had relatively higher pesticide residues. This is because if strawberries with removed stems are soaked in water, residual pesticides will enter the interior of the fruit with the water, causing more serious pollution. And the most recommended cleaning method is to rinse with clean water, then soak in clean water, rice washing water, diluted salt water, and baking soda for 5 minutes before rinsing clean. Strawberry is actually a summer fruit. Strawberry belongs to a type of berry, which is rich in juice, sweet and sour, and delicious. In my childhood memories, strawberries were only available in summer and rarely seen in winter, but now even in winter, strawberries can be eaten. Some people may wonder, "What season of fruit is strawberry?" In fact, under natural conditions, strawberries are the seasonal fruit in summer. The most suitable growth temperature for it is around 20 ℃. In general, when the soil temperature is between 15 ℃ and 23 ℃, it is suitable for the growth of strawberry roots; When the air temperature is between 20 ℃ and 25 ℃, strawberries have the best effect on photosynthesis. Therefore, strawberries cultivated in the open field are generally planted from August to September and picked from May to June of the following year. The weather conditions at this time are most suitable for the growth of strawberries. The problem is: Strawberries are so delicious! There is really a shortage of supply. In order to let everyone enjoy showcasing strawberries in winter, greenhouse strawberry cultivation has emerged. At present, the planting area and consumption of strawberries in China rank first in the world, with almost 90% of strawberry cultivation being achieved in greenhouses. Strawberries cultivated in greenhouses usually start preparing from June to August, are planted around September, and are picked and put on the market around New Year's Day, with a harvesting period of up to three months. The low outdoor temperature in winter is not suitable for the growth of strawberries, and there is also a risk of freezing to death. Greenhouse planting can manually control temperature and humidity, pollination, and soil conditions to ensure the healthy growth of strawberries. So strawberries transformed from "summer fruits" to "winter fruits". Someone said, "Isn't this just out of season fruit? It's not good for the body!" In fact, out of season fruits and vegetables are already very common now, so there's really no need to worry. Strawberries are quite picky about their growth environment requirements. Temperature, humidity, moisture, light, and other factors can all affect the photosynthesis of strawberries, thereby affecting their quality. Strawberries grown in greenhouses can be artificially controlled under these conditions to ensure normal photosynthesis, with good flavor and quality. As for the plant growth regulators that everyone is concerned about, normal use is not harmful to the human body. As long as they are cleaned, you can eat them with confidence. Strawberries are sweeter in winter,