Why is watermelon not sweet? How to plant to improve sweetness? What if it's not sweet?

Many people will have a question about why some watermelons are sweet while others are not sweet. If you eat sweet, you will be in a good mood, and if you eat something that is not sweet, you will feel that you have lost money. So, why is watermelon not sweet? How to plant to improve sweetness? How to choose sweet watermelon? What if the watermelon is not sweet?

First, why is watermelon not sweet?

Reasons why watermelons are not sweet 1. Different varieties. Watermelon because of different varieties, sugar content is different, comparison will feel that one variety of melon than another variety of melon is not sweet.

The reason why watermelon is not sweet 2, lack of light. The sweetness of watermelon is mainly determined by sucrose, fructose, glucose and other sugars, the formation of these sugars can not be separated from photosynthesis, watermelon is not sweet without strong photosynthesis.

The reason why watermelon is not sweet 3. Improper application of nitrogen fertilizer. Nitrogen fertilizer is very important to the growth and development of watermelon. if the application of nitrogen fertilizer is too much or too late, and the lack of carbon in the transformation process, it will affect the absorption and utilization of nitrogen fertilizer in watermelon, the sugar content of watermelon is low, watermelon is not sweet.

The reason why watermelon is not sweet 4, lack of nutrition. The lack of sufficient nutrient supply in soil will affect the synthesis, transformation and transport of sugar in watermelon. If there is not enough sugar, the watermelon is not sweet.

The reason why watermelon is not sweet 5, the temperature difference between day and night is not strong. As we all know, watermelons are well-known in Xinjiang, Lanzhou, Gansu, Dezhou, Shandong, Dongtai, Jiangsu and other places, all of which have a characteristic of large temperature difference between day and night. The temperature difference between day and night is not strong, which is not conducive to the accumulation of sugar. Watermelons are not sweet if the sugar content is low.

The reason why watermelon is not sweet 6. Improper water control. Many watermelon producing areas have the saying that "drought melon is sweet". If there is heavy rain or watering before harvest, the watermelon will not be sweet.

The reason why watermelons are not sweet is 7. In order to get watermelons on the market early, many melon farmers have picked watermelons that are not fully ripe. Watermelons that are not fully ripe are naturally not sweet.

Second, how to plant watermelons to improve sweetness?

The method of planting watermelon to improve sweetness 1. Select a good variety. Grow sweet watermelons that customers like.

The method of planting watermelon to improve sweetness 2. Improve the intensity of photosynthesis. Strong photosynthesis during the day can increase the transformation of sugar, accumulate more sugar and improve the sweetness of watermelon. It can be solved by increasing light intensity and prolonging light time, which is for growing watermelons in greenhouse. The drip-free greenhouse film with low temperature resistance and anti-aging can be used to improve the light intensity, and the dust on the film can be removed to enhance the light transmittance; artificial light can be used to prolong the light time.

The method of planting watermelon to improve sweetness 3, increase the content of carbon dioxide. Watermelons need carbon dioxide to help convert sugar during their growing season. They can accumulate fresh horse manure in the shed, or burn propane and coke in the shed and release dry ice to increase carbon dioxide content.

The method of planting watermelon to improve sweetness 4. Rational application of nitrogen fertilizer. Excessive application of nitrogen fertilizer will affect the quality of watermelon, and too late application of nitrogen fertilizer will affect the transformation of sugar in watermelon.

The method of planting watermelon to improve sweetness 5. Increase the temperature difference between day and night. The temperature is high during the day and low at night, which is beneficial to the accumulation of sugar. Planting watermelons in the greenhouse can artificially control the temperature in the greenhouse and enhance ventilation at night.

Methods of planting watermelons to improve sweetness 6. Proper harvest. Do not water before harvest 7; if it is planted in the open air, if it rains, the harvest time can be delayed, although the price of delayed harvest will be reduced, but the price of high-quality watermelons will be increased.

Third, how to choose sweet watermelon?

The selection of sweet watermelon depends on whether the circle at the bottom of the watermelon is smaller, whether the color of the watermelon skin is turquoise, whether the grain of the watermelon skin is neat, whether the pedicel of the watermelon is curled into a circle, and whether there is an empty sound of "pounding" on the watermelon.

Fourth, how to deal with watermelons that are not sweet?

The flesh of the watermelon can be dug out in a bowl, mixed with an appropriate amount of sugar, and eaten well; you can also put the watermelon in the refrigerator until it is cold; or you can make honey watermelon, make fruit salad, squeeze into watermelon juice and add some sugar, boil watermelon syrup.