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, and the proportion of young leaves is too small. The fruit is mature until the sugar accumulation period. The supply of nutrients is insufficient. The plants are prematurely decayed, the leaves are aging, and the ability to make nutrients is weakened or lost. The skin of the fruit is crispy to maintain nutrients in order to maintain its own development instead of leaves. Peel to maturity. The surface chlorophyll synthesis 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 melons, 10 days before the listing, it is not particularly arid, do not water, watering will significantly reduce the sweetness of 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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