1. Strictly control the humidity. By watering and adjusting

Measures such as air outlets adjust the soil and air humidity in the shed. If the humidity is too low, physiological drought will occur, and the accumulation of bitterness will be easily formed. The air humidity requirement in the shed is: the relative humidity should be kept at 75% in the morning and 70% in the afternoon. The ground should be watered at the right time, avoid flooding with large water, and do “eat less meals” to keep the soil dry and not wet, and the water content is moderate.

2. Hang the thermometer inside the shed. Keep the temperature in the shed at 25 °C ~ 30 °C in the morning and 20 °C ~ 25 °C in the afternoon. Such a temperature can effectively avoid the temperature generated by bitterness and also contribute to the growth and development of cucumber.

3. Rational fertilization. Fertilization is unreasonable and prone to occur, resulting in poor reproductive growth and increased bitterness. According to the requirements of cucumber, the ratio of nitrogen, phosphorus and potassium required for 5:2:6 is scientifically fertilized. Apply 5,000-6,000 kg of high-quality farmyard manure per mu, and mix it with 50 kg of diammonium phosphate. Apply it to the planting ditch and mix well with the soil. Topdressing to control the amount of nitrogen fertilizer during the seedling period, appropriate application of phosphorus and potassium fertilizer to prevent the length of the plant; in the medium term, appropriate increase of nitrogen fertilizer, with phosphorus and potassium fertilizer to meet the needs of a large number of flowering results; late spraying of 0.3% potassium dihydrogen phosphate solution 2~3 times. It can not only meet the nutrient needs, increase the yield of cucumber, but also effectively prevent the production of bitter.

4. Reasonable close planting. Improve ventilation and light transmission conditions, rational close planting, and carry out large and small planting. The line spacing is 80 cm, the small line spacing is 60 cm, the plant spacing is 30 cm, and about 4000 plants per mu are suitable. This will not only improve photosynthesis, increase yield, but also effectively control the production of bitter.

5. Topping. It can promote the fruit vines results, control the stems and grow long, ensure good light transmission, improve the photosynthetic function of the leaves, and have a good effect on preventing bitterness.

6. Spray rare earth. In the seedling stage, the initial flowering stage and the young melon stage, the rare earth micro-fertilizer is sprayed once, the photosynthetic efficiency of the leaves is increased, the disease resistance is increased, the bitterness is controlled, the sugar content of the cucumber is increased by 1%~2%, and the yield and quality are obviously improved. improve. According to the test, spraying rare earth micro-fertilizer 3 times can increase yield by 5%~6.8%.

7. Foliar spray of sugar and fertilizer mixture. In the flowering and fruiting stages, spraying 1~2 times of sugar and fertilizer mixture can increase the yield, improve the quality, and make the cucumber crisp and sweet. Method: 500 grams of sugar per acre, 500 grams of urea, 150 kilograms of water, mixed evenly, sprayed on the surface after 4 pm without strong wind, spraying 80-100 kg per acre, to make the front of the blade Both sides and the opposite side are covered with a mixture.

8. Bitter melon cannot be kept. If the bitter cucumber is planted, 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 some of the surface layer to taste and choose to leave the seed without bitterness. (Jia Youjiang)