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1. temperature.
When the temperature or ground temperature is lower than 13 degrees Celsius, cell permeability is reduced, nutrients and water absorption are inhibited, and cucumbers are susceptible to bitterness; greenhouse temperatures above 30 degrees Celsius and too long duration can cause bitter cucumbers. Therefore, we must try our best to increase the temperature and heat preservation performance of the protection facilities, adjust the temperature, and avoid the temperature boundary formed by bitterness.
2. Moisture.
It is necessary to supply cucumbers with water needed for growth in time to maintain the turgor pressure of plant tissues, the stability of plant body temperature and the order of biochemical melons. Watering should be done a few times and the water temperature should not be too low. Micro-irrigation technology should be used as far as possible under the membrane to prevent the formation of cucumber bittersin due to water deficiency in the plants. Special attention should be paid to the fact that the seedlings should not be excessive after colonization, otherwise the root melons are easy to bitter.
3. Balanced fertilization.
During the fruiting period of cucumber flowering, fertilization should be balanced. The ratio of ammonia, phosphorus and potassium should be 5:2:6. Foliar application of rare earth micro-fertilizer, spraying once at seedling stage, initial flowering stage and young melon stage; spraying urea liquid on foliar, applying urea 7.5 kg plus 2250 kg of water every 15 mu in full flowering stage and full fruit period, mixing and spraying. Foliar spraying cytokinin, cucumber spray 2-3 times before and after the new split antibiotic Tongwei No. 1.
4. density.
Implanting densely and poorly in light can cause the cucumber to have a bitter taste. Cucumber cultivation in protected areas should adopt the method of early close planting and late planting, that is, common plant spacing 26-30 cm, row spacing 60 cm, now planted at 15 cm spacing, "single plant" on the same ridge is not on shelves, when it grows to 12 - When 14 true leaves are sharpened, they are quickly picked up and the main vines are unpicked after harvesting. The "replica" is put on the shelf. When the plants grow to 1.2-1.4 meters high, they are sharpened, making them faster. After the main vines were harvested, they were unplugged. In this way, early yield can be increased by nearly 1 times, and the occurrence of bitter melons can also be reduced.
5. 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.
Cucumber is bitter because it has a substance called bittersin C in its plants. Judging from the current varieties of cucumber, cucumber varieties that are absolutely not bitter are not present. Therefore, cucumber varieties that are slightly bitter in taste should be selected, and the rational use of cultivation measures should be emphasized.