The bitterness of cucumber is due to the presence of a substance known as bittersin in its plants, which has the highest content in the cucurbits of cucumbers and cucumbers and severely affects the taste of cucumbers. In the process of cucumber cultivation, necessary measures should be taken to reduce the formation of bitter melons. The main measures are as follows: First, avoid low temperature or high temperature When the temperature or the ground temperature is lower than 13°C, the permeability of the cells is reduced, the absorption of nutrients and moisture is inhibited, and the cucumber is susceptible to bitterness. A greenhouse with a temperature above 30°C and a long duration can also cause bitter cucumbers. Therefore, in winter, it is necessary to enhance the thermal insulation performance of the protection facilities. In the high temperature season, shade nets should be installed to avoid the temperature boundary formed by bitterness. Second, watering should be reasonable and timely 1. In the case of higher temperatures and less soil moisture, physiological drought occurs in plants and it is easy to produce bitter melons. At this time, the cucumber must be supplied with water in time to maintain the turgor of the plant tissue and the stability of the plant body temperature. 2. Watering should be done a small number of times, water temperature should not be too low, to prevent the lack of water in the plant body lead to the formation of cucumber bittersin. 3. Pay special attention to the seedlings should not be excessive after planting, otherwise the root melon is easy to bitter. Third, fertilization should be balanced 1. Root fertilization. Seedlings should be controlled with nitrogen fertilizers to avoid plant growth. By the end of the flowering period, the ratio of nitrogen, phosphorus, and potassium uptake by cucumbers is basically 5:2:6. At this stage, it is necessary to strengthen the supply of nitrogen and potassium fertilizers. 2. Top dressing. In the seedling stage, initial flowering stage, young cucumber stage foliar spray rare earth fertilizer 1 times. In the flowering period and full fruit period, spraying 0.5 kg of urea and 150 kg of water per acre is performed after spraying. Fourth, the density should not be too large Implanting densely and poorly-illuminated can cause the bitter taste of cucumber to increase. Cucumber planting in protected areas should adopt the method of early close planting and late planting, that is, the common plant spacing is 26-30 cm and the row spacing is 60 cm. If planted at a distance of 15 cm, the odd-numbered plants on the same ridge will not be on the shelf. When it grows to 12 true-leaves, it will be quickly picked up, and the main vines will be unpicked after harvesting. When the plant grows to a height of 1.2 meters, it picks up the tip, speeding it up and picking up the main melon. In this way, early yield can be increased by nearly 1 times, and the occurrence of bitter melons can also be reduced. Fifth, to prevent injury Injury will increase the bitterness of the cucumber. Seed sowing on the production of sand table sowing, to minimize the rooting when the seedlings raised, sub-plastic application of plastic nutrient pods or paper pockets, cultivation should be as far as possible mulching mulching film cultivation, shoveling should be slightly earlier, slightly shallow late. Six, bitter melon can not be left If cucumbers with bitter taste are preserved, the cucumber produced by the next generation will still have a bitter taste. Therefore, when the cucumber is about to mature, it is necessary to take a portion of the surface layer and choose a no-bitter taste.
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