Melons planted in plastic greenhouses will soon be available in large quantities. Every buyer wants to buy good, sweet and crispy melons, especially farmers who grow sweet melons. He also hopes that the melons he grows will be liked by buyers and they will sell for a good price. The melons currently on the market do have poor color and sweetness, and they sell 20% to 50% less than the high-quality cantaloupe. What is the reason that causes the color of the melon to be poor and not sweet? The main reasons are the following:
1, improper selection of varieties. The sweetness of muskmelon is related to the species nature. When planting muskmelon, we must choose high-quality varieties.
2, pruning is too heavy, the proportion of young age leaves is too small, the fruit is mature until the sugar accumulation period of nutrient supply is insufficient, premature aging of plants, aging leaves, weaken or lose the ability to produce nutrients, fruit epidermal cells in order to maintain their own development instead of leaves to create nutrients, to The synthesis of chlorophyll on the surface of mature skin is greater than the amount of decomposition, so that the skin cells contain a lot of chlorophyll, can not turn yellow, so the color is poor, sweetness is also poor.
3, the number of leaves retained in the whole plant is too small, the fruit is bare to the outside, most of the fruit surface is exposed to direct light, easily causing the temperature of the fruit to increase, inhibiting the synthesis of yellow carotenoids. Direct light favors the synthesis of green chlorophyll. Scattered light contributes to the synthesis of yellow carotenoids. The shaded fruit receives more scattered light and first expresses the carotenoid yellow. Therefore, the fruit covered by the leaves is colored well.
4, improper use of water and fertilizer. In the late stage of melon fruit setting, 10 days before listing, it is not particularly arid, do not water, watering will significantly reduce the sweetness of the melon. The melon should pay special attention to the application of potassium fertilizer during the growth period, and the potassium fertilizer can obviously improve the quality of the melon. To control nitrogen fertilizer, excessive application of nitrogen fertilizer will not only reduce the sweetness of the melon, but also make the accumulation of nitrite too much, which is harmful to the human body. For the fertilization of melons, the principles of nitrogen control, phosphorus application and potassium increase should be mastered so that nitrogen, phosphorus and potassium can be used in combination. In order to increase the sweetness of the melon, sweeteners such as potassium dihydrogen phosphate or Baofengling can be sprayed on the leaves 10 days before harvest, and 10% sugar can also be sprayed.
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